Appreciate your efforts. Yes, military use of HF for short distances is used all the time. HF is excellent for avoidance of interception. Direction Finding is still pretty easy, as the radiated signal will still be omnidirectional for upto 300km before the skip starts. The 320 has a fantastic Tuning Unit, which does a great job with those whips. Great drone footage.
Good to see you back Gil, hope to work you one day from here in the U.K. my twin brother was an Army radio operator, used The 320 often. They tended to use either the whip or wire Dipoles out in the field and never had trouble getting out (they had to get out or they would be shouted at hi hi). He is the guilty one for getting me started in this hobby a few years ago.
Yes, my particular interest too. Hf for local and semi local contacts. Apparently in Nam the US soldiers pioneered the use of HF radio to make contact from scout units back to base thru the miles of incredibly thick jungle vegatation using VNIS propagation .
Good to see you back, Gil! I hope you and yours are doing well. HF is certainly usable for local comms. I'm working on an NVIS now, but your whip setup has me rethinking things.
Such a great location too - but I wouldn't want to spend a night up there in the winter! Sure, anyone can spend money on a big tower, three element HF beam and a kilowatt linear, but what you are doing looks MUCH more fun.
Before VHF became a thing in the 90s, hams routinely used 10M for local comm. We had under-dash rigs, repeater networks, and the whole 8.23 meters. Wish we still did.
@@RadioPrepper Thanks so much for responding. I'm new to this, got my General license here in the US (the license that gives us HF privileges). Is NVIS my only option for getting reliable coverage within 75-100km? Thanks!
HF is very usable for local communications, though I have noticed that the signals are receivable only if they are very close or in the NVIS range. I could not hear stations 7 miles away, but I could hear stations across the state (Texas). I did hear one on 40 meters that was 60 over, and when I looked up his call sign I realized he lived on my street. :D
Polarization really matters for short-range 10m. I need to have both dipole and an EFHW sloper, depending on what the other guy has. The wrong polarization makes the other guy sound like he is blowing bubbles underwater.
Your videos are great! I just got my HAM about a month ago and have already ordered the tri band QRP guys antenna on your advice for the Xeigu G90. Cool stuff. VA7SPV 73 Cheers!
Most in my VHF/UHF simplex group are also preppers working on NVIS setups for more regional coms. I was pleasantly surprised how well 75 and even 160 worked for regional coms during DAYLIG|HT. And you are right about DFing an NVIS bounce it would be very tough because unless the monitoring station is within your ground wave or maybe in an aircraft they are not going to find you. 40 meters does pretty good for NVIS but I find those lower bands even a bit better for NVIS raining back down over a couple hundred miles radius. This Spring I am going to delve into Mag-loops for NVIS and see how they do since it would not be hard to put a coax-shield based loop into a rucksack.
Nice video! Yes, that is true, even 0 to 200km really near vertical incidence or "NVIS" is not possible to geolocate accurately if a sigint operator tracks the skywave (even with modern TDOA tech, etc). You need to get within near LOS to get the direct or refracted wave to geolocate near 1km or so (TDOA with multiple receivers receiving the direct wave to get within 100m). Adapting the signature (physical LPD sort of) by using valleys as transmit sites blocks the ground wave towards a potential electronic warfare operator forcing them to geolocate with the skywave. Near vertical skywave is near impossible to geolocate (no pun intended), but I can tell you more on how an EW force would work to geolocate a difficult target. I'm both a military signals operator and a ham op with abt 6 years experience specifically experimenting avoiding EW systems (russians especially, obviously). Using the terrain as signature adaption is pretty common for military RF work, but my approach applying it to HF is not that common, but turns out works really well. Mil HF for comms within a battalion or similar is usually always within 200km using very low hanging antennas (2m above ground for example), i.e no skipzone, 0-400km skywave only (easily confirmed by assuring there is QSB, otherwise it's not skywave... also confirmed to be skywave that you need to change QRG at the evening and during the night, etc).
Thanks, indeed! The Germans got quite good at it during WWII though, so definitely something to keep in mind... Not to mention wires being visible on millimeter-wave synthetic-aperture radar...
2 роки тому+2
@@RadioPrepper Germans used similar methods EW operators use today (except better equipment and coordination today of course). First coarse geolocation via large sites (during WW2, one was in Paris), naval DF for e.g Norway followed by sig recon air assets. Once narrowed down, boots on the ground (vehicles or as DF troops on skis in Norway that Germany utilized). In Italy they even drove around in mocked icecream trucks with direction finders (trouble when locals wanted to buy icecream). It's a long process, today it's a highly coordinated effort between multiple branches. A few transmissions from the same site will not get you located, for example. What some Norwegian radio agents did wrong was to send from the same site for months (as SIS had told them HF is impossible to geolocate). This is "normal" HF, not the signature adapted one I talked about, that's a different story (i.e a large HF geolocation site 1000km away will not even receive the signal). Also, HF below foF2 (i.e true NVIS) does not penetrate the ionosphere so it is not heard by satellites. Having some insight into SAR (the radars) from collegues, you don't see the small wires we use on these (even if you did, you will see soldiers or hides earlier and easier), especially not if the antennas are installed where they are supposed to for work in a contested environment (in a forest, underneath the tree tops). Heat signature from vehicles near the transmit site would be what you look for (cool vehicles should not show up as they should be camouflaged if correct discipline is utilized). I have seen antenna arrays on highres SAR images, but these antennas are huge, bare metal reflective, nothing like the ones we use as hams for portable ops, for example.
2 роки тому+1
@@RadioPrepper Actually, yes, you would see a T2FD on a highres SAR image, was not thinking about those kind of antennas, but more concerning the supports and midsection, not the wire itself. Can be hidden in the forest of course, which is recommended.
2 роки тому+4
@@RadioPrepper Spoke to my SAR source who basically said "no, very unlikely we could find a thin antenna wire, usually appears transparent", but I pushed for a theoretical scenario and got this: Hires low frequency spotlight-mode SAR, "below 2GHz" (to see through leaves, etc). Must be horizontal polarisation to see a horizontal wire (more pixels will show reflections). The caveat, my SAR source explained, was that it takes 1-3 days to relocate the satellite, for a commercial satellite (that you pay premium per image) it could take between 2-4 weeks. An orbit takes up to 2 hours and for these hires spot images and usually only has capacity for 1 of these very hires images which arrives up to 2 hours after imaging. All of this, my SAR source explained, usually means the target has already moved when we get the data, "if we could find this needle in a hay stack to begin with". Base stations, hides, vehicles, etc, is obviously much easier to find underneath camouflage and tree canopies and a fixed camp is unlikely to relocate within the window it takes to get and analyse the image. SAR on an airplane would be less efficient as it's better to send up a signal reconnaissance aircraft instead.
I previously thought that 27 MHz was a bad allocation for CB. I look back and think I was wrong. It's very hilly here around Brighton, and 10/11m sure does curve round those hilltops. G7TXU
Yes, i used to think the same. but that was like around the time of a sunspot maxima circa 1980 and every one of the channels was chock full of signals from italy in the morning and north america onwards with the usual exotic stuff only really the big boys with beams could hear and work. i lost count of the times i tried to work these huge skip signals to only be able to hear my call sign repeated back thru the am/ssb 9++ hetrodyning !. now i realize that the band is VERY useful during a sunspot mininum because after all 27 mhz is really the beginning of VHF "low band" - well 30 mhz is LoL. Add RF speech processing and/or a decent compressor mic and ground contact ranges even base to mobile are very respectable with good antenna's and not a lot of power. rivals anything on VHF/UHF .
I wonder if, with a short whip and a long counterpoise, their roles switch and the counterpoise becomes the effective radiating element.. Great video, as always Gil. Hope to catch you on the radio some time. Ronan MM0IVR
We are waiting more about short distance effective communications by using such as short antennas and qrp radios whether it is military based or not..thanky you Gil we realy missed you and your fantastic videos..73 de Ta3iid used to be Ta3le..
Before repeaters, 80 and 160 ground wave was popular. You can talk many Km from one valley to another and much more on a boat. If you get some skip, that's nice too.
I like your videos because I have a connection to France. I have done bicycling tours, everywhere in the North, from Lille to Brest to Nantes and Paris. I chose the North because my brother had a house in Montreuil-sur-Mer dans le Pas de Calais. But I never made many contacts there, QRP, VHF. I would like to return to travel around the South. Better weather for sure! Salut et 73 Barry, VE7VIE
@@RadioPrepper I rode the Paris-Brest-Paris event twice, and am very familiar with cobblestones (pavés )! I even crashed on them at one point. And I also rode part of the Paris-Roubaix route once. But at least not in the Winter. Now I ride up mountains here (CN..) for SOTA and the VHF contests.
@@RadioPrepper Four times I cycled the LF1 bike route from Boulogne-sur-Mer to Texel, the northern tip of Holland. I think I cycled from Hazebrouck to Poperenge to cross the first border. When I got the Texel a Euro VHF contest was going on and I met a couple of hams with a VHF/UHF superstation in the back of their little car with a high mast and multiple yagis. I think it was 2003. I did take pictures which I have somewhere....
It could be a form of adventure to do groundwave on bands that are at a 0 propogation time of day, example 20 meters at midnight, 80 meters at noon, but some get really noisy when the bands are in that "dead" phase, but trying things to reduce noise and simply trying filter techniques to just work thru the noise. Needs to almost be a new ARRL holiday or contest.
Excellente vidéo, comme toujours. Qui plus est je m'intéresse particulièrement aux EMCOMM (dans mon environnement c'est cohérent) et le NVIS est surprenant par ses capacités. Sinon, tu bois cet ersatz de café? Donne moi ton adresse en mp que je te fasse goûter notre production locale..😉
Thanks again Gill! fun footage; you are pretty good at flying that thing! I am more inspired to try local coms with HF as a result of your "U-TUBE" Stay safe KI7RJS
@@RadioPrepper thank you. I also have the PRC 320 but never used it much and I have more recently. So I wanted to get that mic. Thank you 73 from Scotland 🏴
@@RadioPrepper 180km is not that close. Late morning/early afternoon is perfect for such experiments with NVIS on 40M. We can try with your QRP and without CP one day 😉
Appreciate your efforts.
Yes, military use of HF for short distances is used all the time.
HF is excellent for avoidance of interception. Direction Finding is still pretty easy, as the radiated signal will still be omnidirectional for upto 300km before the skip starts.
The 320 has a fantastic Tuning Unit, which does a great job with those whips.
Great drone footage.
Thank you!
Good to see you back Gil, hope to work you one day from here in the U.K. my twin brother was an Army radio operator, used The 320 often. They tended to use either the whip or wire Dipoles out in the field and never had trouble getting out (they had to get out or they would be shouted at hi hi). He is the guilty one for getting me started in this hobby a few years ago.
Yes, keep an ear out for me on week-ends!
@@RadioPrepper will do!
Yes, my particular interest too. Hf for local and semi local contacts. Apparently in Nam the US soldiers pioneered the use of HF radio to make contact from scout units back to base thru the miles of incredibly thick jungle vegatation using VNIS propagation .
Where VHF would most likely fail!
@@RadioPrepper i forgot to say it did ! that is why they resorted to HF
Great video Gil as a QRPer learning CW you have been a fantastic source of help and info but I'm shocked, a Frenchman drinking instant coffee! 😃
I know right! LOL thanks.
I thought exactly the same thing......:)
Great to see you back on UA-cam Gil! Excellent videos! Thank you.
Good to see you back, Gil! I hope you and yours are doing well.
HF is certainly usable for local comms. I'm working on an NVIS now, but your whip setup has me rethinking things.
Thanks. I was surprised about the NVIS on 40m, probably due to the 10m counterpoise on the ground, but I had a good signal...
Awesome video Gil. Also nice to see you back.
73
Julian oh8stn
Thanks Julian, indeed! It's good to take a little break too and come back with renewed enthusiasm!
Such a great location too - but I wouldn't want to spend a night up there in the winter! Sure, anyone can spend money on a big tower, three element HF beam and a kilowatt linear, but what you are doing looks MUCH more fun.
Yes! And it does get cold up there..
I have the same idea, but using 10M radios, I do use 80M and 40M for regional comms. 10M has short antennas, a lot of power, and SSB.
Before VHF became a thing in the 90s, hams routinely used 10M for local comm. We had under-dash rigs, repeater networks, and the whole 8.23 meters. Wish we still did.
@@RobMacKendrick8.23 meters just doesn't sound as good as 9 yards
Is 10m decently reliable at communicating within a 75km radius?
No, unless you're on a hill.
@@RadioPrepper Thanks so much for responding. I'm new to this, got my General license here in the US (the license that gives us HF privileges). Is NVIS my only option for getting reliable coverage within 75-100km?
Thanks!
I liked your video! Especially your friends in background hearing your qso's and smiling!
Tanks for the Video, HF is my fav. Dirty Diaper 21 in S.C.( I hit all your buttons,and I am a new channel friend)
Thanks for the cool video! Very interesting with the military radios and the short antennas! 😃
Thanks for the video, very interesting topic. Looking forward to seeing your next 😀
Thanks for another good video. Glad to see you back.
Good stuff! I wish I was more knowledgeable about military radios. I seen tons of them at hamcation.
HF is very usable for local communications, though I have noticed that the signals are receivable only if they are very close or in the NVIS range. I could not hear stations 7 miles away, but I could hear stations across the state (Texas). I did hear one on 40 meters that was 60 over, and when I looked up his call sign I realized he lived on my street. :D
Polarization really matters for short-range 10m. I need to have both dipole and an EFHW sloper, depending on what the other guy has. The wrong polarization makes the other guy sound like he is blowing bubbles underwater.
Indeed, a loss of 19db when crossed-polarized.
Your videos are great! I just got my HAM about a month ago and have already ordered the tri band QRP guys antenna on your advice for the Xeigu G90. Cool stuff. VA7SPV 73 Cheers!
Good choices :-)
Gil the Thomson-CSF sounds lovely beautiful audio
Always surprises people! I never tried a speaker on thev320 but the 372 sounds like hi-fi!
Most in my VHF/UHF simplex group are also preppers working on NVIS setups for more regional coms. I was pleasantly surprised how well 75 and even 160 worked for regional coms during DAYLIG|HT. And you are right about DFing an NVIS bounce it would be very tough because unless the monitoring station is within your ground wave or maybe in an aircraft they are not going to find you. 40 meters does pretty good for NVIS but I find those lower bands even a bit better for NVIS raining back down over a couple hundred miles radius.
This Spring I am going to delve into Mag-loops for NVIS and see how they do since it would not be hard to put a coax-shield based loop into a rucksack.
I have a 5m perimeter mag loop and it works great!
Great style of video Gil, and these are some of my favorite radio's.🖐🏻73's🎙🎧 KD9OAM📻
Thanks, I will yet try to improve my editing!
That's a serious HF radio you have!!
Nice video! Yes, that is true, even 0 to 200km really near vertical incidence or "NVIS" is not possible to geolocate accurately if a sigint operator tracks the skywave (even with modern TDOA tech, etc). You need to get within near LOS to get the direct or refracted wave to geolocate near 1km or so (TDOA with multiple receivers receiving the direct wave to get within 100m). Adapting the signature (physical LPD sort of) by using valleys as transmit sites blocks the ground wave towards a potential electronic warfare operator forcing them to geolocate with the skywave. Near vertical skywave is near impossible to geolocate (no pun intended), but I can tell you more on how an EW force would work to geolocate a difficult target. I'm both a military signals operator and a ham op with abt 6 years experience specifically experimenting avoiding EW systems (russians especially, obviously). Using the terrain as signature adaption is pretty common for military RF work, but my approach applying it to HF is not that common, but turns out works really well. Mil HF for comms within a battalion or similar is usually always within 200km using very low hanging antennas (2m above ground for example), i.e no skipzone, 0-400km skywave only (easily confirmed by assuring there is QSB, otherwise it's not skywave... also confirmed to be skywave that you need to change QRG at the evening and during the night, etc).
Thanks, indeed! The Germans got quite good at it during WWII though, so definitely something to keep in mind... Not to mention wires being visible on millimeter-wave synthetic-aperture radar...
@@RadioPrepper Germans used similar methods EW operators use today (except better equipment and coordination today of course). First coarse geolocation via large sites (during WW2, one was in Paris), naval DF for e.g Norway followed by sig recon air assets. Once narrowed down, boots on the ground (vehicles or as DF troops on skis in Norway that Germany utilized). In Italy they even drove around in mocked icecream trucks with direction finders (trouble when locals wanted to buy icecream). It's a long process, today it's a highly coordinated effort between multiple branches. A few transmissions from the same site will not get you located, for example. What some Norwegian radio agents did wrong was to send from the same site for months (as SIS had told them HF is impossible to geolocate). This is "normal" HF, not the signature adapted one I talked about, that's a different story (i.e a large HF geolocation site 1000km away will not even receive the signal). Also, HF below foF2 (i.e true NVIS) does not penetrate the ionosphere so it is not heard by satellites.
Having some insight into SAR (the radars) from collegues, you don't see the small wires we use on these (even if you did, you will see soldiers or hides earlier and easier), especially not if the antennas are installed where they are supposed to for work in a contested environment (in a forest, underneath the tree tops). Heat signature from vehicles near the transmit site would be what you look for (cool vehicles should not show up as they should be camouflaged if correct discipline is utilized). I have seen antenna arrays on highres SAR images, but these antennas are huge, bare metal reflective, nothing like the ones we use as hams for portable ops, for example.
@@RadioPrepper Actually, yes, you would see a T2FD on a highres SAR image, was not thinking about those kind of antennas, but more concerning the supports and midsection, not the wire itself. Can be hidden in the forest of course, which is recommended.
@@RadioPrepper Spoke to my SAR source who basically said "no, very unlikely we could find a thin antenna wire, usually appears transparent", but I pushed for a theoretical scenario and got this: Hires low frequency spotlight-mode SAR, "below 2GHz" (to see through leaves, etc). Must be horizontal polarisation to see a horizontal wire (more pixels will show reflections). The caveat, my SAR source explained, was that it takes 1-3 days to relocate the satellite, for a commercial satellite (that you pay premium per image) it could take between 2-4 weeks. An orbit takes up to 2 hours and for these hires spot images and usually only has capacity for 1 of these very hires images which arrives up to 2 hours after imaging. All of this, my SAR source explained, usually means the target has already moved when we get the data, "if we could find this needle in a hay stack to begin with". Base stations, hides, vehicles, etc, is obviously much easier to find underneath camouflage and tree canopies and a fixed camp is unlikely to relocate within the window it takes to get and analyse the image. SAR on an airplane would be less efficient as it's better to send up a signal reconnaissance aircraft instead.
Very informative, thank you. Have you seen the S2 Underground channel?
I previously thought that 27 MHz was a bad allocation for CB. I look back and think I was wrong.
It's very hilly here around Brighton, and 10/11m sure does curve round those hilltops. G7TXU
Yes, i used to think the same. but that was like around the time of a sunspot maxima circa 1980 and every one of the channels was chock full of signals from italy in the morning and north america onwards with the usual exotic stuff only really the big boys with beams could hear and work. i lost count of the times i tried to work these huge skip signals to only be able to hear my call sign repeated back thru the am/ssb 9++ hetrodyning !. now i realize that the band is VERY useful during a sunspot mininum because after all 27 mhz is really the beginning of VHF "low band" - well 30 mhz is LoL. Add RF speech processing and/or a decent compressor mic and ground contact ranges even base to mobile are very respectable with good antenna's and not a lot of power. rivals anything on VHF/UHF .
Hi Tony, from 1.7 miles away!
73 de M3KXZ
I wonder if, with a short whip and a long counterpoise, their roles switch and the counterpoise becomes the effective radiating element.. Great video, as always Gil. Hope to catch you on the radio some time. Ronan MM0IVR
I suspect as much...
I think antenna should have discussed more, and let's extend the topic, please.
I will later :-)
We are waiting more about short distance effective communications by using such as short antennas and qrp radios whether it is military based or not..thanky you Gil we realy missed you and your fantastic videos..73 de Ta3iid used to be Ta3le..
There will be more!
Again perfect video as usuall...thank you Gil..73...de Ta3iid...
Yay! Gil's back!
Excellent video. Thank you
Before repeaters, 80 and 160 ground wave was popular. You can talk many Km from one valley to another and much more on a boat. If you get some skip, that's nice too.
Yes, and repeaters are not to be relied upon..
It's been a while. Nice to see your latest video. I hope that you are keeping well.
Thanks, well enough :-)
I like your videos because I have a connection to France. I have done bicycling tours, everywhere in the North, from Lille to Brest to Nantes and Paris. I chose the North because my brother had a house in Montreuil-sur-Mer dans le Pas de Calais. But I never made many contacts there, QRP, VHF. I would like to return to travel around the South. Better weather for sure! Salut et 73
Barry, VE7VIE
Did you try the famous stone paved roads in the North?
@@RadioPrepper I rode the Paris-Brest-Paris event twice, and am very familiar with cobblestones (pavés )! I even crashed on them at one point. And I also rode part of the Paris-Roubaix route once. But at least not in the Winter. Now I ride up mountains here (CN..) for SOTA and the VHF contests.
I was born and raised ten mile from Roubaix :-)
@@RadioPrepper Four times I cycled the LF1 bike route from Boulogne-sur-Mer to Texel, the northern tip of Holland. I think I cycled from Hazebrouck to Poperenge to cross the first border. When I got the Texel a Euro VHF contest was going on and I met a couple of hams with a VHF/UHF superstation in the back of their little car with a high mast and multiple yagis. I think it was 2003. I did take pictures which I have somewhere....
Oh man, do I know those names! :-) Too cold for me up there though..
Caffe and radio 😍
73 👋👋
It could be a form of adventure to do groundwave on bands that are at a 0 propogation time of day, example 20 meters at midnight, 80 meters at noon, but some get really noisy when the bands are in that "dead" phase, but trying things to reduce noise and simply trying filter techniques to just work thru the noise. Needs to almost be a new ARRL holiday or contest.
Absolutely, and it might lead to big surprises..
@@RadioPrepper Right, and don't forget about the squelch knob!
If there was one ;-)
Excellente vidéo, comme toujours. Qui plus est je m'intéresse particulièrement aux EMCOMM (dans mon environnement c'est cohérent) et le NVIS est surprenant par ses capacités. Sinon, tu bois cet ersatz de café? Donne moi ton adresse en mp que je te fasse goûter notre production locale..😉
Volontier merci!! Elle est sur qrz.com
Air raid siren at 6:12 into the video? Reminds me of the every Wednesday 12 noon test of the sirens back in my home town.
Must have been a test, as there was no raid 😉
Thanks again Gill! fun footage; you are pretty good at flying that thing! I am more inspired to try local coms with HF as a result of your "U-TUBE" Stay safe KI7RJS
Thanks! Certainly worth a try..
Perhaps I missed the amount of RF power you used on that particular afternoon?
20 to 30W.
Very cool video. Merci!
Nice........................
I would love to see more of your drones.
ua-cam.com/channels/rHRhALanLvH7xelya_PFLw.html
Bon Matin Monsieur
Merci!
Check out daytime bands other than 20 Meters there's been good openings daylight
Fantastic video Gil ! Was wondering if someone was interested in acquiring a military hf radio who would be a dependable and knowledgeable provider ?
clansman-radio.co.uk
Security shutters. Nice.
Plastic unfortunately..
i wear the same hat !! 20th century motor corporation ! good on ya i just subscribed btw 73 kc7moz
Good catch ;-)
MdR la tête du reveil...
T'inquietes pas on est tous comme cela le matin
Oui, c'est pas une série télé, LOL.
What's the name of the mic you are using.
It's a Racal handset.
@@RadioPrepper thank you. I also have the PRC 320 but never used it much and I have more recently. So I wanted to get that mic. Thank you 73 from Scotland 🏴
You are missing out! That handset is hard to find, more so with the right connector. I got lucky.
@@RadioPrepper I know I've been looking since I seen your video. So I will keep an eye out. But love your videos.
What ? Instant coffee ? :(
I know right...
💥 Ｐ𝐫Ｏ𝕞Ｏ𝓢ｍ
Ah oui c'était bien le 7100 KHz qu'ils écoutaient; la fréquence des déchets humains français licenciés, la honte ultime de l'hexagone.
Oui, incroyable...
Thank you for the qso Gilles. On 40M we had half wave dipol, 10m above the ground plus 300W out. Vy73's de F4VSQ (TM5F)
Thanks! I was surprised that the whip worked as close as 180km.. Maybe the counterpoise is the culprit.. Gil.
@@RadioPrepper 180km is not that close. Late morning/early afternoon is perfect for such experiments with NVIS on 40M. We can try with your QRP and without CP one day 😉
As an addition, small documentary of our activity this weekend ua-cam.com/video/C9wj3On7abM/v-deo.html
Sure, email me at gil@radiopreppers.com we'll set that up some time :-)
Awesome radios! Where do you get one of those these days? Hamfests? I always enjoy your videos. 73 de Guido LU8EQ
Hi, try clansman-radio.co.uk
This makes more fun than working an modern sdr! 73 de Nik OE3SZE