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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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12th Jan 2007, 11:41 pm | #1 |
Heptode
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 664
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British TV sound IF Frequency
Not having ant data on the British TV early/late sound IF frequencies;
can anyone tell me if any other sets ezcept the early US made sets used a 21 MC sound IF? I am trying to build a tuner subber for the early US sets (Have 5 I am repairing) and need a 21 MC sound IF tuner for the project. Sadly, I am not having much luck here in the states trying to locate one out of a "parts set". If any of the British- or other- made sets used this sound IF freq, I'd like to give it a go at adapting one of these tuners for my project. Thanks. FrankB |
13th Jan 2007, 10:02 am | #2 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
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Re: British TV sound IF Frequency
Hello Frank,
I cannot recall a single British set that used a 21mc i.f. The nearest we got to this was 16/19mcs that was used on most sets just into the band 3 era around 1955/56. There were many odd i.f. frequencies but the chances of finding a set even with those is almost zero. They were only used with fix tuned band 1 only sets. Regards John. |
13th Jan 2007, 12:47 pm | #3 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: British TV sound IF Frequency
Hi!
ISTR hearing about very early UK TVs using a 14 Mc. IF But I've never heard of a 21Mc. IF in a UK TV. What I have heard of is 21Mc. as an IF being used in radar & UHF receiving equipments - but nothing specific springs to mind (yet!). Al / Skywave |
13th Jan 2007, 1:16 pm | #4 |
Dekatron
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,274
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Re: British TV sound IF Frequency
Hi Frank,
As John says there are lots of 50s sets with 19.5MHz sound IFs and a few with 23.5 MHz. The nearest to your needs is 21.5 MHz which was used on English Electric model 1550 and 1550M for channel 2 and 4 reception areas. The Channel 1 sets had their IFs tuned to 20 MHz. I suspect it would be easier to modify something else than to track down a 1550. Peter. |