This channel has the best audio of the 100+ channels I'm subscribed to. Sometimes I watch an episode I'm not interested in just to hear the good audio quality.
My Dad was a Ham Operator & Physician. He built a LASER transmitter and small parabolic antenna receiver. He then sent live images from Ultrasound Scanner from his Lab to his home, 3 miles away. It worked for quite a while until the receiver over-heated and caught fire... 😬.
As an American it amazes me that you can transmit video to a relay for public consumption. We have public access timeslots on a few large metro areas. Good work.
There are PC board log periodic antennas out there that will cover that range. Not sure how much power they will handle since they are circuit boards with copper trace antenna elements. There was an American Ham who was making and selling these about 20 years ago but I did recently come across a Chinese site that was selling clones of these antennas as well as panel antennas for WiFi and Bluetooth. Recently I purchased a low power DATV transmitter that is capable of various formats of digital transmission formats. It is specifically designed for use in a low power in house tv networks within hotels where they can rebroadcast local stations, in-house advertisements, weather info provided by computer as well as composite video all "real time" into a multi coupler to create the in house cable tv system. Have not set it up yet since time does not permit plus I need to find out which of the DATV formats are in use in my region of the EU.
Great stuff Matt, yep a horizontal yagi and some very low loss coax will be the trick, I'm not sure what you have going up to the vertical but there are probably big losses there too. Back in the 90's I did analogue 23cm TV and my amp and tx were mast mounted.
@@TechMindsOfficial That's good, those units are really small though and that TX can be controlled across a really long stretch of Cat5/6 easily. Mast mounting could be a real option! Worth a look?
Thanks Matt, very interesting. I shall have to have a go at receiving GB3TV from my QTH. Quite a distance though being Norfolk based. But am on high ground. Well, high by East Anglia standards!
Hi Matt, did you measure the actual RF strength from the amp at all as these seem very well priced, I could do with a couple but only if the output is over 10w. Cheers for this video, very useful indeed.
You could etch a yagi antenna for 23 cm onto a PCB, with the only soldered part being the connector. Weatherproof with hot glue and you've got a suitable (but ugly) antenna for a few quid.
I would say the (Vertical) Antenna you are using to TX is fine at 1.249 Gig (Vertical).. From what I gather the DTV Repeater Antenna is a "Dual Alford Slot" (Design) also Vertical.. The Only Referance to Horizontal Polorization that I can see for the "DTV Repeater Description".. If you TX on 437 MHz then the Antenna for that is (A Horizontal Loop).. (For audio) and 144.55 2 Meter Receive.
I briefly covered this in the video. I use OSB to gather the Audio and Video, and then DATV Easy you select OBS as the video source. DATV Easy then encodes the video and uses the transmitter to transmit it.
OBS Studio. Its an application which can gather audio/video and media sources. Normally designed to encode and stream to streaming platforms. We use OBS to create a virtual camera, which DATV Easy picks up on the same computer. OBS supports screen capture, images, media files and webcams etc.
can i ask if its possible to make a video about plugins on airspy or sdrpp I seen you have so many plugins mine wont work . like tera is muted cant unmute . i have few but most wont work . i seen you have sooo many .
This channel has the best audio of the 100+ channels I'm subscribed to. Sometimes I watch an episode I'm not interested in just to hear the good audio quality.
Wow, thanks!
My Dad was a Ham Operator & Physician. He built a LASER transmitter and small parabolic antenna receiver. He then sent live images from Ultrasound Scanner from his Lab to his home, 3 miles away. It worked for quite a while until the receiver over-heated and caught fire... 😬.
As an American it amazes me that you can transmit video to a relay for public consumption. We have public access timeslots on a few large metro areas. Good work.
Kudos for doing this. This is exactly what nuts like us do. If you have a wife that didn't roll her eyes, kudos to her too.
One of the coolest videos I have watched in your channel and radio channels in general.
Well done, I used the analogue setup for GB3TV around 18 years ago.
Im currently building some ATV capacity into my shack and this has really helped me to visualise a set up.
A video on making that yagi would be really neat, I’m sure it will make a huge difference!
Awesome video! This is a excellent test!
Thank you!
There are PC board log periodic antennas out there that will cover that range. Not sure how much power they will handle since they are circuit boards with copper trace antenna elements. There was an American Ham who was making and selling these about 20 years ago but I did recently come across a Chinese site that was selling clones of these antennas as well as panel antennas for WiFi and Bluetooth.
Recently I purchased a low power DATV transmitter that is capable of various formats of digital transmission formats. It is specifically designed for use in a low power in house tv networks within hotels where they can rebroadcast local stations, in-house advertisements, weather info provided by computer as well as composite video all "real time" into a multi coupler to create the in house cable tv system. Have not set it up yet since time does not permit plus I need to find out which of the DATV formats are in use in my region of the EU.
nice test Matt. nice equipment looking forward to your video about making a Yagi for that freq.
Great stuff Matt, yep a horizontal yagi and some very low loss coax will be the trick, I'm not sure what you have going up to the vertical but there are probably big losses there too.
Back in the 90's I did analogue 23cm TV and my amp and tx were mast mounted.
I use Formula Zero, which is almost identical to Westflex W103.
@@TechMindsOfficial That's good, those units are really small though and that TX can be controlled across a really long stretch of Cat5/6 easily.
Mast mounting could be a real option! Worth a look?
Thanks Matt, very interesting. I shall have to have a go at receiving GB3TV from my QTH. Quite a distance though being Norfolk based. But am on high ground. Well, high by East Anglia standards!
Try whacking a 45* wedge between the mount and the pipe/mount. Might be able to reduce the loss to ~10dB. (Cross polarized)
So cool Mat
Cheers dude
hi sir your vids are very helpfull
Hi Matt, did you measure the actual RF strength from the amp at all as these seem very well priced, I could do with a couple but only if the output is over 10w. Cheers for this video, very useful indeed.
Not yet, I need to figure out the best way to measure it, in other words I need to find a reliable power meter for that band :-)
@@TechMindsOfficial it would also be interesting to know the harmonic distortion of the amp. Also those aliex dcdc connectors are pretty noisy ime.
You could etch a yagi antenna for 23 cm onto a PCB, with the only soldered part being the connector. Weatherproof with hot glue and you've got a suitable (but ugly) antenna for a few quid.
Make sure that PA is linear (NOT class C), also check it's harmonic output, you have no LPF'ing at all.
I would say the (Vertical) Antenna you are using to TX is fine at 1.249 Gig (Vertical).. From what I gather the DTV Repeater Antenna is a "Dual Alford Slot" (Design) also Vertical.. The Only Referance to Horizontal Polorization that I can see for the "DTV Repeater Description".. If you TX on 437 MHz then the Antenna for that is (A Horizontal Loop).. (For audio) and 144.55 2 Meter Receive.
The Alford Slot is an omni-directional horizontally polarized antenna, from what I have been told. Cheers
@TechMindsOfficial Ah OK.. What a slick Repeater. Would be fun to have one in my area .. Thanks for posting the demonstration Video.👍
HI Matt, is this amplifier bidirectional?
Wonder if I can do that with a ic9700
What Lime SDR model would you suggest to start this? Yes to 23CM antenna and please include 3D printing parts if you find a good one. Thanks!
can you measure please the output power of that amplifier?
Very cool! 73s
How are you getting the video feed into your transmission system?
I briefly covered this in the video. I use OSB to gather the Audio and Video, and then DATV Easy you select OBS as the video source. DATV Easy then encodes the video and uses the transmitter to transmit it.
@ I guess I asked the question wrong. What does your actual video gathering? I assume it’s some kind of small camera?
OBS Studio. Its an application which can gather audio/video and media sources. Normally designed to encode and stream to streaming platforms. We use OBS to create a virtual camera, which DATV Easy picks up on the same computer. OBS supports screen capture, images, media files and webcams etc.
@@TechMindsOfficial Ah!!!! Now I understand. The video of your garden that went to the DATV site was a recording. I had assumed it was live. Thanks!
@N8XS it was live, from a webcam plugged into my computer :)
What kind of device is in the power amplifier ? 73 Jan
You flatlanders and your fancy line of sight!
Make a yagi for 1.2 they are simple to make or even mod a small dish you probably don't even need that much power with one
That's odd. My post vanished.
I didn’t see it, try again.
Americans how does your beloved HOA love those antennas
Excellent work Matt
de m0zww 73
Many thanks!
can i ask if its possible to make a video about plugins on airspy or sdrpp I seen you have so many plugins mine wont work . like tera is muted cant unmute . i have few but most wont work . i seen you have sooo many .