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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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13th Aug 2018, 10:08 pm | #1 |
Pentode
Join Date: Apr 2009
Location: Durham, UK.
Posts: 165
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Redifon ATU - ID Please
A friend showed me a Redifon ATU which he's had for a long time. It is a substantial piece of equipment. He hasn't found out which Redifon equipment it belongs to and would like to know. (So would I.)
I have added a couple of pictures showing the front panel and the rear panel with the ID plate. It's pretty clean inside with fixed caps, a variable cap, inductors & a roller coaster. Can anyone help? Jeff |
14th Aug 2018, 3:05 am | #2 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,871
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Re: Redifon ATU - ID Please
Two possibilities: The Redifon GA481 100W linear amplifier and the Redifon HFA125 125W amplifier.
the former is grey, the latter green. I used to have an HFA125, but I swapped it for a Marconi H2900! I may still have a field repair kit (spare boards) for it. One of the Redifon power amps used multiple modules in an oil-filled case! David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
14th Aug 2018, 9:29 am | #3 |
Heptode
Join Date: Feb 2008
Location: Great Barr, Sandwell, West Midlands, UK.
Posts: 589
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Re: Redifon ATU - ID Please
This ATU was part of the Redifon GR410 and GR410T station Jeff, also known as the Larkspur C14 I believe...
Cheers, Martin G4NCE |
14th Aug 2018, 10:54 am | #4 |
Pentode
Join Date: Apr 2009
Location: Durham, UK.
Posts: 165
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Re: Redifon ATU - ID Please
Hi David & Martin
Thanks for the info. I looked the C14 set up in Louis Meulstee's Compendium 2. Interesting set, looks quite useful with 100W SSB. Many thanks for the info. Regards Jeff G6CQH |
14th Aug 2018, 8:34 pm | #5 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,998
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Re: Redifon ATU - ID Please
I've got one of those as part of my HF station. See photo.
It's a Tuning Unit, Aerial - Manual" model 6288R [NATO Stock Number 5820-99-949-2756] Designed to load relatively-short mobile whip antennas [10-20 foot] generally on the lower-end of the HF band [1.6-10MHz] A batch of them were sold onto the UK surplus market in the 1970s and reappear regularly at radio-rallies. I got mine from the Newbury rally a decade back; you can guarantee to see at least one turn up there every year. I paid £10 for mine. They have one major weakness - the cam-detents on the rotary switches are made of 'Mazak' and so after a few decades they go crystalline and crumbly. |
15th Aug 2018, 8:50 am | #6 |
Heptode
Join Date: Feb 2008
Location: Great Barr, Sandwell, West Midlands, UK.
Posts: 589
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Re: Redifon ATU - ID Please
There is a bit more info on the GR410 HERE. When I had one I eventually had to make up some extender 'cards' from connectors and cable so the boards could be worked on live out of the chassis.
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