Harvard 420M CB27/81 UK FM CB radio - repair & service

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One of the best ever Cybernet 134 based sets is the Harvard 420M. You get exactly the same board as the York 863, Rotel 240 & Binatone 5-star....but with less fiddly/unneccesary/pointless controls & knobs. Whereas the lower range Cybernet 134 sets like the Rotel 220 & York 861 have one less tuned circuit in the receive; this set has that extra receive circuit & a bigger 3.5" speaker too. This one turned out to be exceptional & after replacing the reference crystal which was faulty, I was able to tune the radio to a full 4W output & receive at 0.2uV fir 12dB SINAD.

Recorded 7th September 2024

Richard, G0OJF

Lincolnshire, UK

(C) Tango Systems Group 2024

  1. UK FM CB radio servicing
  2. Richard Shireby G0OJF
  3. TSG Communications
  4. UK CB radio
  5. CB radio servicing
  6. Lincolnshire UK
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Комментарии
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Nice sets these never seen one in the old days sadly only the good buddy owned by others.

JamesHowe-civt
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My favourite 27/81 set... mic on the front, no silly chrome, and the half-balanced mixer circuit.

robertbrown
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A Golden Oldie Radio this, my first and favourate CB Radio still got this somewhere lurking about somewhere!

RobCharles
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On 19 that sounds like someone was playing one of them old records that had sound effects on it like haunted house or something,

chris_vandepeer
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Hi RICHARD I've just bought one Harvard 420 M. And that's what I call great timing. But the one I've just got don't turn on, so it's coming to you, I'm going to look at were I've got to send it. And I'll get in touch with you soon Alan from Leighton buzzard. 💯🇬🇧👍

alanslade
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That on 19 i think is from Nottingham..
been getting a lot of it recently,
probably someone who wants to be famous by being on your video and being called 'Nottingham Burner Brigade'..

CBRadioWayBack-
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The 10.240 reference crystals i think are HC-18 socket. I think i am brain dead this morning thinking hard lol.

Quartz crystal 10.240 MHz HC-49s is a cut down smaller version of the HC-18. I will keep an eye out if i find any for a good price.

chris_vandepeer
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hi 👋 richard good luck repairing &servicing the harvard 420m cb 27/81 uk fm cb radio from paul chapman at east sheen 73's

paulchapman