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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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Old 22nd Jan 2019, 11:06 pm   #1
hammarlund 7
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Location: Ormskirk, Lancashire, UK.
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Default Racal RA1772.

help and advice needed ,I,ve had a problem with my rx losing digits on display,after playing for a while it sorts itself out,now I find it wont tune in fast mode,slow will and in reverse it tunes at (almost )normal speed,my shack is outside in a wooden insulated building,which has a low wattage heater left on and a dehumidifier,could it be because it,s too cold?this rx was probably switched on 24/7 in it,s working life,any comments would be appreciated,Regards Merv G6NJJ
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Old 23rd Jan 2019, 12:23 am   #2
Radio Wrangler
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Default Re: racal ra 1772

Are the OBIC displays fitted into sockets? Contacts can be iffy.

THe bias on opto-isolator type RPG detectors can need adjustment to get them going reliably.

David
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Old 23rd Jan 2019, 11:25 am   #3
IanG3XYV
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Default Re: Racal RA1772.

Merv,

My 1772 would start up intermittently. I can't remember the precise details but I did a search on this forum and others and read that the griplets joining top and bottom of the psu PCB, after time, could fail to conduct. A good dose of solder applied with my Weller seems to have done the trick. It's a fairly simple thing to try - the psu does get quite hot I recall, and you never know, it may be the cause of your problems indirectly.
The thread here discusses:

https://www.vintage-radio.net/forum/...ad.php?t=69206

Ian
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Old 23rd Jan 2019, 11:47 am   #4
Craig Sawyers
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Default Re: Racal RA1772.

There is a Yahoo group called RacalRA17forum. Although says RA17 it covers things like the RA1772 too. The RA guru Rob Filby is on the group.

Craig
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Old 14th Mar 2019, 10:54 pm   #5
hammarlund 7
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Default Re: Racal RA1772.

many thanks for all replies,Regards Merv G6NJJ
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