UK Vintage Radio Repair and Restoration Discussion Forum

UK Vintage Radio Repair and Restoration Discussion Forum (https://www.vintage-radio.net/forum/index.php)
-   Vintage Amateur and Military Radio (https://www.vintage-radio.net/forum/forumdisplay.php?f=13)
-   -   Racal RA1772. (https://www.vintage-radio.net/forum/showthread.php?t=153371)

hammarlund 7 22nd Jan 2019 11:06 pm

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

Radio Wrangler 23rd Jan 2019 12:23 am

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

IanG3XYV 23rd Jan 2019 11:25 am

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

Craig Sawyers 23rd Jan 2019 11:47 am

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

hammarlund 7 14th Mar 2019 10:54 pm

Re: Racal RA1772.
 
many thanks for all replies,Regards Merv G6NJJ


All times are GMT +1. The time now is 4:39 pm.

Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.