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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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20th Jun 2016, 11:26 am | #1 |
Retired Dormant Member
Join Date: Jun 2016
Location: Saguenay, Quebec, Canada
Posts: 3
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Canadian Racal RA8772
Glad to read about the RA1772 here: https://www.vintage-radio.net/forum/...ad.php?t=69206
I've Just acquired the Canadian version, the RA8772. I find it low in sensitivity for now, but that is less troublesome than the fact that the tuning will only go down in frequency, not up. Before opening up the beast, could anyone direct me to a possible cause ? Thanks Last edited by AC/HL; 20th Jun 2016 at 12:53 pm. Reason: Thread split |
20th Jun 2016, 5:42 pm | #2 |
Tetrode
Join Date: Feb 2006
Location: Newport Pagnell, Buckinghamshire, UK.
Posts: 95
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Re: Canadian Racal RA8772
One of the bulbs in the tuning encoder has blown.. A very common fault in my experience back in the day...
I can't remember the exact bulb type except it's small. They can be accessed by looking at the back of the tuning encoder - It's been a long time... The encoder is just an optical shutter wheel that turns with the tuning knob. Two bulbs shine through it to photocells behind...
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Jim G4MEZ |
20th Jun 2016, 6:00 pm | #3 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,800
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Re: Canadian Racal RA8772
There are adjustments for the optical encoder and they are notorious for drifting. You'll need to adjust them periodically. One of the bulbs could also have blown.
David
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