A note on first, second and third harmonics. The primary frequency I am transmitting on is the first harmonic. Then the second and third follow as shown on the video. When I refer to the second harmonic as the "first" I am meaning to say, the "fist harmonic seen after the first..." I hope I didn't make that too confusing! Thanks!
Dont forget that without the antenna you are only testing part of "the system". A halfway decent 2M/70CM antenna will present an impedance mismatch to the second harmonic which may well bring marginal cases within specification.
It would be interesting to see if the Baofeng harmonies are different on the antenna than into a dummy load. Since the dummy load presents a consistent load on a large amount of bandwidth, an antenna would not. Therefore it may be possible that in a real world use of the radio, the harmonics are attenuated by the fact the antenna is not resonant there. You would have to use a fixed antenna on both the receiver and the transceiver, with good separation to maintain the protection of the receiver input. You’d also need to make sure nothing moves in the area of or between the transmitter and receiver antennas that would cause fluctuations in the signal.
Ham Radio Crash Course I would put a resonant antenna on your attenuator instead of directly plugging the radio to it, then place your HT at least a wavelength away, key up and see if you have enough signal that way. The receiver may not even need an antenna, maybe just leaving the attenuator input disconnected would be adequate coupling for you to move the HT close enough to it get the reference signal reading you need.
I have seen this same logic used in other posts to dispute the original HT testing ARRL did in I think 2013. If the antenna is considered part of the system and it does attenuate the harmonics even slightly, then the radio would indeed be in spec while in actual use. Of course, then we add different antennas so all bets are off, hi hi.
cyclecamp1 the manufacturer or FCC may see this as a “user modification” and place the responsibility directly on the operator. I know that may sound like a stretch, but there are millions of items that get type acceptance based on supplied equipment/accessories. I’ve noted that antenna connections are sometimes non-standard, which could be a sign they may not be compliant if used with an amp or other antenna. Good ole Apple of course does this for money purposes, and that can also be the driving force for ham devices too. In an example of this “stretching with a rule....” As a pilot, I fly a Cirrus airplane. The FAA rules for certification requires some ability for a pilot to recover from a stall. The particular popular model I fly did not demonstrate this appropriately enough on its own, but does so with a ballistic rocket parachute deployment known as CAPS. Thus, the parachute is “required” for it to gain and maintain its certification.
Looking to get one of these very soon. Got my tech license a couple months ago, and taking my general this next week. Im trying to determine if there is an antenna for the sdrplay that gives a wide band range that may make sense for just a receive
I’ll also add that I’ve for years I’ve used a USB on the go cable to connect an RTL with to an Android phone using an SDR app, for very portable use. The Android powers the RTL just fine. I was able to DF a spur of a broadcast FM station a few years ago using it. You can also get an ACARS and ADSB apps to use with it too.
Why is -46dB under the fundamental at -3dB not passing? Looks like it's -43dB, which is better than -40dB, which is the rule. Did I miss something there?
Admittedly, this is not something I know a lot about but could we maybe hook an antenna to this and use it to search for RFI sources? Very interesting video. Thanks Josh
Hello , I've been using this software since last year , And it's very good for what it is , Makes a very handy spectrum analyser out of my SDR play RSP1 , I've also got two standalone spectrum analyser s in the shack , but find I use this one more 👍... Regards de Marc 'Gw0wvl' ...
Hello, my name is James, I've been on your live stream before. I was wondering if you'd travel to other states for Ham Radio Conventions. The ShyWy Amateur Radio club in Cheyenne Wyoming is holding the Wyoming Ham Con on September 12th 2020. If your interested, let me know. Interesting video. So, just how bad would that first harmonic on your F8 effect other radios, and how far away would it effect them? I've yet to get a decent answer.
I’m always interested in checking out all kinds of ham radio events. My issue is time off work and covering travel. I’m going to Hamvention for sure this year.
@@HamRadioCrashCourse Okay the Convention here in Cheyenne will be September 11th, that's a Friday night and it will just be a meet and greet. The actual convention will be on Saturday the 12th, from 8 am to 2-3 pm, ish, could go longer if we have things to do. I can ask the committee if we could get you a travel allowance. You are after all well known, at least to those of us Hams who are on UA-cam. Any ways, let me know what you think. I will talk to my people and let you know.
I believe the video said you were going to supply links on Amazon where i/we could order the same stuff you had in video? Am I blind or is it not here yet?
A note on first, second and third harmonics. The primary frequency I am transmitting on is the first harmonic. Then the second and third follow as shown on the video. When I refer to the second harmonic as the "first" I am meaning to say, the "fist harmonic seen after the first..." I hope I didn't make that too confusing! Thanks!
do you read minds? This is just what i was searching about. I thought it was only possible with hackrf and specific drivers
Well understood. Thanks. I'd like to see this a live stream.
It will likely be this Friday!
Dont forget that without the antenna you are only testing part of "the system". A halfway decent 2M/70CM antenna will present an impedance mismatch to the second harmonic which may well bring marginal cases within specification.
Awesome! I did not know SDRPlay put out a spectrum analyzer app!
This is really cool! I have to get myself one of these radios.
Great video Josh.
Also covers stuff I'm studying on my Extra manual so double cool sir!
It would be interesting to see if the Baofeng harmonies are different on the antenna than into a dummy load. Since the dummy load presents a consistent load on a large amount of bandwidth, an antenna would not. Therefore it may be possible that in a real world use of the radio, the harmonics are attenuated by the fact the antenna is not resonant there. You would have to use a fixed antenna on both the receiver and the transceiver, with good separation to maintain the protection of the receiver input. You’d also need to make sure nothing moves in the area of or between the transmitter and receiver antennas that would cause fluctuations in the signal.
This is not a bad idea either. Ideally you’d need some kind of faraday cage though to make sure the only received signals were the radio under test.
Ham Radio Crash Course I would put a resonant antenna on your attenuator instead of directly plugging the radio to it, then place your HT at least a wavelength away, key up and see if you have enough signal that way. The receiver may not even need an antenna, maybe just leaving the attenuator input disconnected would be adequate coupling for you to move the HT close enough to it get the reference signal reading you need.
I have seen this same logic used in other posts to dispute the original HT testing ARRL did in I think 2013. If the antenna is considered part of the system and it does attenuate the harmonics even slightly, then the radio would indeed be in spec while in actual use. Of course, then we add different antennas so all bets are off, hi hi.
cyclecamp1 the manufacturer or FCC may see this as a “user modification” and place the responsibility directly on the operator. I know that may sound like a stretch, but there are millions of items that get type acceptance based on supplied equipment/accessories. I’ve noted that antenna connections are sometimes non-standard, which could be a sign they may not be compliant if used with an amp or other antenna. Good ole Apple of course does this for money purposes, and that can also be the driving force for ham devices too.
In an example of this “stretching with a rule....” As a pilot, I fly a Cirrus airplane. The FAA rules for certification requires some ability for a pilot to recover from a stall. The particular popular model I fly did not demonstrate this appropriately enough on its own, but does so with a ballistic rocket parachute deployment known as CAPS. Thus, the parachute is “required” for it to gain and maintain its certification.
I'm gonna have some time on my hands real soon, so I will try this out. Thanks
Great information! Thanks for sharing!
The Yaesu 4X is a sweet little radio.
Silly question can i connect a sdr play example to my aor 8600 scanner cheers from mr newbie uk...
Looking to get one of these very soon. Got my tech license a couple months ago, and taking my general this next week. Im trying to determine if there is an antenna for the sdrplay that gives a wide band range that may make sense for just a receive
I’ll also add that I’ve for years I’ve used a USB on the go cable to connect an RTL with to an Android phone using an SDR app, for very portable use. The Android powers the RTL just fine. I was able to DF a spur of a broadcast FM station a few years ago using it. You can also get an ACARS and ADSB apps to use with it too.
Good call here as well!
Ohhhhhh shiney! I have a Duo, so 2 channel specan!
Why is -46dB under the fundamental at -3dB not passing? Looks like it's -43dB, which is better than -40dB, which is the rule. Did I miss something there?
So will you still use your Chinese radios
Admittedly, this is not something I know a lot about but could we maybe hook an antenna to this and use it to search for RFI sources? Very interesting video. Thanks Josh
Hello , I've been using this software since last year , And it's very good for what it is , Makes a very handy spectrum analyser out of my SDR play RSP1 , I've also got two standalone spectrum analyser s in the shack , but find I use this one more 👍... Regards de Marc 'Gw0wvl' ...
Thanks for the comment!
Whats the name of this software Good Year Thanks
It’s free off the SDRPlay website. I can’t remember the name.
Hello, my name is James, I've been on your live stream before. I was wondering if you'd travel to other states for Ham Radio Conventions. The ShyWy Amateur Radio club in Cheyenne Wyoming is holding the Wyoming Ham Con on September 12th 2020. If your interested, let me know. Interesting video. So, just how bad would that first harmonic on your F8 effect other radios, and how far away would it effect them? I've yet to get a decent answer.
I’m always interested in checking out all kinds of ham radio events. My issue is time off work and covering travel. I’m going to Hamvention for sure this year.
@@HamRadioCrashCourse Okay the Convention here in Cheyenne will be September 11th, that's a Friday night and it will just be a meet and greet. The actual convention will be on Saturday the 12th, from 8 am to 2-3 pm, ish, could go longer if we have things to do. I can ask the committee if we could get you a travel allowance. You are after all well known, at least to those of us Hams who are on UA-cam. Any ways, let me know what you think. I will talk to my people and let you know.
Hi James, email me at hoshnasi@gmail.com if you get some more details I would be interested in doing a talk and meet-and-greet.
I believe the video said you were going to supply links on Amazon where i/we could order the same stuff you had in video? Am I blind or is it not here yet?
It’s there. Look at for the amazon link.
Click the See More button, and then you will see more. LOL
Will this software work with other sdr's?
No. Not the version on sdrplay site.
Hate live streams.
Ok