What have I got? - UK Vintage Radio Repair and Restoration Discussion Forum

Alan Stepney · 18th Aug 2013, 6:31 pm

I bought this recently and wondered if anyone can positively identify it.

The front has three knobs, the left and right ones switching contacts on the coil bank.

The centre moves a slug that travels inside the coil bank.

The coils, which are wave round, are NOT in series but the two switches (left and right) appear to connect them, or parts of them, in various combinations.

It appears to be an ATU (or part of one) but the wire on the coils is too thin to handle much power, so cant have been used for any sizeable transmitter.

The construction has a military look about it, possibly RAF.

There are no numbers on it.

Any suggestions of ideas?

Sean Williams · 18th Aug 2013, 6:45 pm

Its the output loading section of a T1154 transmitter.

Alan Stepney · 18th Aug 2013, 8:32 pm

Thanks.
I knew it was vaguely familiar, and should have remembered what it was.

Just need to decide what to do with it now!

lesmw0sec · 19th Aug 2013, 1:25 pm

I made a remarkably good crystal set for LW with one of those - many years ago!

Les.

GW3OQK Andrew · 19th Aug 2013, 1:37 pm

Could be OK in series with an inverted L aerial to tune 472 kHz. I made my own variometer to do that. I use my T1154 on the band now and then, which has the very unit pictured, via 350 pf to a 50 ohm cable.
Andrew

18th Aug 2013, 6:31 pm	#1
Alan Stepney Rest in Peace Join Date: Feb 2008 Location: Dorset, UK. Posts: 947	What have I got? I bought this recently and wondered if anyone can positively identify it. The front has three knobs, the left and right ones switching contacts on the coil bank. The centre moves a slug that travels inside the coil bank. The coils, which are wave round, are NOT in series but the two switches (left and right) appear to connect them, or parts of them, in various combinations. It appears to be an ATU (or part of one) but the wire on the coils is too thin to handle much power, so cant have been used for any sizeable transmitter. The construction has a military look about it, possibly RAF. There are no numbers on it. Any suggestions of ideas? Attached Thumbnails

18th Aug 2013, 6:45 pm	#2
Sean Williams Dekatron Join Date: Feb 2005 Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW Posts: 3,518	Re: What have I got? Its the output loading section of a T1154 transmitter. __________________ Engineers make things work and have spare bits when finished

18th Aug 2013, 8:32 pm	#3
Alan Stepney Rest in Peace Join Date: Feb 2008 Location: Dorset, UK. Posts: 947	Re: What have I got? Thanks. I knew it was vaguely familiar, and should have remembered what it was. Just need to decide what to do with it now!

19th Aug 2013, 1:25 pm	#4
lesmw0sec Octode Join Date: Jul 2009 Location: Carmel, Llannerchymedd, Anglesey, UK. Posts: 1,509	Re: What have I got? I made a remarkably good crystal set for LW with one of those - many years ago! Les.

19th Aug 2013, 1:37 pm	#5
GW3OQK Andrew Pentode Join Date: Apr 2011 Location: Swansea, Wales, UK. Posts: 144	Re: What have I got? Could be OK in series with an inverted L aerial to tune 472 kHz. I made my own variometer to do that. I use my T1154 on the band now and then, which has the very unit pictured, via 350 pf to a 50 ohm cable. Andrew