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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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18th Mar 2021, 10:21 am | #1 |
Nonode
Join Date: Jun 2009
Location: Herefordshire, UK.
Posts: 2,495
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Air Ministry IF unit 10U/254
I've tried searching for information on this IF unit. The best I have been able to do is to work out that 10U/254 is likely to be an Air Ministry Stores Reference number. How to find out the designation of the Receiver that incorporates the IF Unit has eluded me. Does 10U mean a Radio IF unit whereas a 10UB would indicate a radar IF Unit??
Photos attached. |
18th Mar 2021, 11:51 am | #2 |
Hexode
Join Date: Jan 2013
Location: Kelvedon, Essex, UK.
Posts: 273
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Re: Air Ministry IF unit 10U/254
Hi Steve.
I am having the same trouble finding info on my if unit RU196. Have a look at my post - "RADAR IF Unit" John. |
18th Mar 2021, 4:51 pm | #3 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: Air Ministry IF unit 10U/254
John,
I've already told you that your unit is part of ASV Mk15 radar, covered by A.P.2544H. I'm struggling with 10U/254. Andy |
19th Mar 2021, 1:24 pm | #4 |
Rest in Peace
Join Date: Mar 2010
Location: Berkshire, UK.
Posts: 72
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Re: Air Ministry IF unit 10U/254
It is IF amplifier from ther TR19xx range of RAF/commercial transceivers.
STC designation STR.9-x I think the frequency is 9.72MHz. Chris |
19th Mar 2021, 6:35 pm | #5 |
Nonode
Join Date: Jun 2009
Location: Herefordshire, UK.
Posts: 2,495
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Re: Air Ministry IF unit 10U/254
Thank you geeoboeh2s for the info.
A search for TR1985 (mentioned on the vmarsmanuals web-site) produced this link: http://www.radiomuseum.co.uk/str9x.pdf So my thanks to radiomuseum as well. |
19th Mar 2021, 7:05 pm | #6 |
Octode
Join Date: Mar 2020
Location: Blackburn with Darwen, Lancashire, UK.
Posts: 1,572
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Re: Air Ministry IF unit 10U/254
Chris is spot on.
The military version of this unit has a different layout, well mine has anyway with two tuning caps per IF stage at the top of the board and a different valve line up in the latter stages. So the STC STR9.x manuals which are online will match that particular IF, here is a pic from the pdf. Adrian |
20th Mar 2021, 11:12 am | #7 |
Nonode
Join Date: Jun 2009
Location: Herefordshire, UK.
Posts: 2,495
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Re: Air Ministry IF unit 10U/254
AdrianH,
Indeed, the IF unit in the STC manuals .pdf fits the one I have, as per your pic. One thing of note is that the input socket has 250 Volts HT on it! (providing the Anode load for the front end stage valve notated as 3V4). |
5th Apr 2021, 12:14 pm | #8 |
Nonode
Join Date: Jun 2009
Location: Herefordshire, UK.
Posts: 2,495
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Re: Air Ministry IF unit 10U/254
Just to wind up this thread. The unit worked without any problem and as advertised!
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