RAF Control Tower Receiver R1132 - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

allan · 13th Aug 2011, 4:58 pm

I found some silver plated tubing. It's about an eighth of inch diameter, wound 3 turns about 3 quarters of an inch and it worked like a charm. R1132 now tunes the low end of the aircraft band with good sensitivity but I need to fix the tracking of the two RF stages. Unfortunately the FM band is present as the image (76-100).
As the original design has the oscillator on the low side there's not a lot one can do. I could add the bandpass filter to improve matters but that wasn't present on my set.
Of course as luck would have it Radio Solent is on 96.1Meg (96.1+24= 120.1) and the local airport (Bournemouth) has ATC frequencies straddling this on 119.475 and 120 odd.
Classic FM on 100.3 is the image for 124.3.

bill knox · 5th Mar 2014, 12:37 pm

Hi Allan

Be a little careful with the diagrams in the manual, there are two circuit diagrams one for before a serial number of approx.. 15000 and a later version.

The problem is, that my receiver has a serial number of 11500 approx. and although the later diagram is very close to the radio there are some differences.

What I am having trouble with at the moment is the AGC, or apparent lack of it I am just waiting for delivery of some more components.

I know this is an old posting but thought the info useful.

REgards

Bill

Julesomega · 5th Mar 2014, 1:50 pm

Weren't there two quite different R1132s? one with the Bakelite dial assembly as per the Radiomuseum and one with circular dial à la TF144G
Anyway, those tuning caps used to be readily available in the surplus stores; I have a few singles and doubles if anyone is attempting to refurbish after the '2m mod'

dave walsh · 5th Mar 2014, 2:17 pm

Bill has inadvertently revived my comment about the 144 Meg conversion article [p8*]. I wondered where that was? [See his 1132A Type 3 PSU Thread]
Dave W

Anthony Thomas · 6th Mar 2014, 4:05 pm

My 1132 has an ECL80 in the output stage plus many other mods too numerous to mention. I am wondering whether to keep as is or revert to original.

Tony.

13th Aug 2011, 4:58 pm	#21
allan Pentode Join Date: Oct 2005 Location: South coast near Ringwood/Christchurch, Dorset, UK. Posts: 230	Re: RAF Control Tower Receiver R1132 I found some silver plated tubing. It's about an eighth of inch diameter, wound 3 turns about 3 quarters of an inch and it worked like a charm. R1132 now tunes the low end of the aircraft band with good sensitivity but I need to fix the tracking of the two RF stages. Unfortunately the FM band is present as the image (76-100). As the original design has the oscillator on the low side there's not a lot one can do. I could add the bandpass filter to improve matters but that wasn't present on my set. Of course as luck would have it Radio Solent is on 96.1Meg (96.1+24= 120.1) and the local airport (Bournemouth) has ATC frequencies straddling this on 119.475 and 120 odd. Classic FM on 100.3 is the image for 124.3.

5th Mar 2014, 12:37 pm	#22
bill knox Hexode Join Date: Mar 2011 Location: Wilstead, Bedfordshire, UK. Posts: 367	Re: RAF Control Tower Receiver R1132 Hi Allan Be a little careful with the diagrams in the manual, there are two circuit diagrams one for before a serial number of approx.. 15000 and a later version. The problem is, that my receiver has a serial number of 11500 approx. and although the later diagram is very close to the radio there are some differences. What I am having trouble with at the moment is the AGC, or apparent lack of it I am just waiting for delivery of some more components. I know this is an old posting but thought the info useful. REgards Bill

5th Mar 2014, 1:50 pm	#23
Julesomega Nonode Join Date: Dec 2012 Location: Stockport, Greater Manchester, UK. Posts: 2,117	Re: RAF Control Tower Receiver R1132 Weren't there two quite different R1132s? one with the Bakelite dial assembly as per the Radiomuseum and one with circular dial à la TF144G Anyway, those tuning caps used to be readily available in the surplus stores; I have a few singles and doubles if anyone is attempting to refurbish after the '2m mod'

5th Mar 2014, 2:17 pm	#24
dave walsh Dekatron Join Date: Jan 2006 Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex. Posts: 5,817	Re: RAF Control Tower Receiver R1132 Bill has inadvertently revived my comment about the 144 Meg conversion article [p8*]. I wondered where that was? [See his 1132A Type 3 PSU Thread] Dave W

6th Mar 2014, 4:05 pm	#25
Anthony Thomas Hexode Join Date: Jan 2013 Location: Ålesund, Norway Posts: 361	Re: RAF Control Tower Receiver R1132 My 1132 has an ECL80 in the output stage plus many other mods too numerous to mention. I am wondering whether to keep as is or revert to original. Tony.