G4NSJ - A close look at a 70cms amateur radio repeater GB3RL

In this video, I take a close look at a 70cms amateur radio repeater. This includes the transceivers, the logic and the duplexer cavities. Thanks to Roy, G4WTV, for his expertise and technical help in making this video.
www.radio-workshop.co.uk/g4ns...

[@buckbrown823]

Thank you again. I always took repeaters for granted without slightest understanding of how they work. While I don't have any repeater circuits, I am about to try the bottle test with some brandy. 73! Buck KA3GEA

[@g4nsj]

Hi, Buck. Great to hear from you. Cheers! 🍺

[@moormoor4281]

Very informative and good learning curve thank you from UK

[@g4nsj]

Thanks!

[@charliesoffer]

Thank you so much Ray - loved learning about some of the intricacies within a UHF repeater. Where would we be without engineers, eh !?

[@g4nsj]

Where would we be, indeed!

[@alzag6hpr553]

Excellent video Ray and very educational, loved the wine bottle analogy. Always look forward to you videos no matter what they are. 73 Allan.

[@g4nsj]

Thanks, Allan.

[@ianxfs]

Great explanation. Thanks Ray 👍🏻

[@g4nsj]

Thanks!

[@Paddy_Roche]

Thanks Ray, great video as always. I appreciated the explanation of the Cavities especially. Please don't stop making the content.

[@g4nsj]

Thanks, Paddy. Great to hear from you. More videos coming soon. Cheers, Ray.

[@polarbear7720]

Very interesting thanks for the insight into repeaters.

[@g4nsj]

Thanks!

[@G4WTV]

Thanks for doing the video Ray, I'm glad I was able to assist in your explanation of how the repeater works. Roy.

[@g4nsj]

Hi Roy, I couldn’t have done it without your expertise and knowledge. I look forward to the next joint video. 👍

[@FrancoDX]

Thanks for posting this up Ray, very informative. Always enjoy your videos and you always make me smile 🙂
If you get chance and given the good conditions on the 10m band could you do a video on your 10m Repeater and others? I think it would be interesting and encourage more use on that section of the band 👍🏼
73 Franco

[@g4nsj]

Hi Franco, a ten metre repeater video is a good idea. I'll give it some thought. Cheers, Ray.

[@MrEdTraveller]

Great video Ray! Thank you for making this one. 73 from Ed M0MNG.

[@g4nsj]

Thanks, Ed. Glad you liked it. 73 Ray.

[@julianrobertson3303]

Hello Ray , I hope that all is well & good . I just wanted to pass on an observation on several programs that I recently watched on RF tower transmitters , all the coax cables are within copper tube conduits in order to minimize RF loss & to restrict external interference & noise .

[@g4nsj]

That's interesting, thanks for the info.

[@richardmillican7733]

Theres a video somewhere in youtube land where a TH-camr built a repeater for the American GMRS system. I seem to recall an American ham channel making one out of a couple of Baofeng HT's.
Incredible science. A bit above my pay scale at the moment 😂

[@AdamDeal-KF0PRI]

were well exdplained!

[@g4nsj]

Thanks, Adam.

[@AdamDeal-KF0PRI]

@@g4nsj your weclome Ray! happy weekend sir and happy Dxing!

[@user-rj6po9cl2b]

Thanks Ray - G3YSW

[@g4nsj]

Thanks, Nigel.

[@barrywendon5168]

TNX Ray good video as always 73 de G6JMX

[@g4nsj]

Thanks!

[@Boozion]

Very cool video. I like the wine bottle effect. Very fun. You should do another video on your morse code switch you where playing with on your last podcast. Love to see that. Anyway thanks for sharing. Take care as always. 😊

[@g4nsj]

Great to hear from you. Good idea about Morse code video. 👍

[@michaelclutton8446]

Thanks for the video Ray 73 de Mike G4VQH

[@g4nsj]

Thanks, Mike.

[@ChuckKirchner-se6ib]

So, this entire video is merely an excuse for you to get pissed?? Ha Ha. Very good analogy, though. I have some experience with THREE TX/RX combinations. THAT is a complicated calibration It is, however exactly the same procedure you just described, just three instead of two. I liked the AUDIO station ID, it sure beats Morse. With our triplexer, we had channel ID telemetry, which was mores, but not numbers, it was a specific sequence that ID'd the channels. 12356 (Pause 1sec) 2. -denoted the channel from Eddington to Almanac Mountain in Maine. Thanks, Ray!!

[@g4nsj]

Hi Chuck, great to hear from you. Haha, you sussed me out with the wine! I didn't drink it all.... not quite! Thanks for the info, very interesting. Cheers, Ray.

[@highflyermw0lkx311]

Thanks Ray de MW0LKX

[@g4nsj]

👍

[@michaelmiller641]

Are you the repeater keeper? I was wondering how you came by this kit? Great video btw

[@mariaviklund4546]

The sense wire that turns the radios on is pin10, Ignition. Just connect it to V+ and the radios will always be on if there is power.

[@g4nsj]

👍

[@user-hh7vf2hs8l]

Set up is almost identical to a mmdvm digital repeater. Only the logic differs. Do you have to use a vocal id or is a morse ID sufficient for an analog repeater in the UK ? 73 PD9PB - PI1BLA

[@g4nsj]

Hi, great to hear from you. We don't have to use a voice ident. But many people think it's a good idea.

[@TRIPPLEJAY00]

Ray, you're awesome. I have always wanted to know how a duplexer works. And I'm glad it was explained by you. Thank you, Sir. 🫡

[@Zeebee1971]

Invar was used to produce shadow masks for color picture tubes.

[@g4nsj]

Interesting, thanks!

[@MrFoxy1951]

It was also sometimes used for pendulums for clocks because of of its very low coefficient of expansion. You don't want a pendulum to change in length with temperature variations.

[@g4nsj]

@@MrFoxy1951 excellent! 👍

[@yinglyca1]

If you keep drinking that wine ,your SWR's Gonna go up and you will blow your finals.
DE VE3TYA

[@g4nsj]

Haha, good point! 🍷🤣

[@CathodeRayNipplez]

Just wondering... might we get more youth into the radio hobby if we stop talking in wavelengths and start talking in frequencies?
Here in Australia 477MHz CB is the everyday comms in every car and truck. Call it a 70cm band radio and everyone will look at you like you're from Mars. Take commercial FM radio, it's all frequency based. "The Breakfast Drive Time Show On 105.5" and everyone knows what 105.5 MHz is but call it the 3 metre band and you're talking gibberish.

[@g4nsj]

Hmm, good point. Great to hear from you. Cheers, Ray.

[@MM0IMC]

At the very start of the video, you sounded quite tired. 🤔

[@g4nsj]

I was tired. I’d been up since 5am. 😴