SSM Europa Transverter - UK Vintage Radio Repair and Restoration Discussion Forum

m0cemdave · 25th Sep 2016, 1:36 am

I am restoring an old SSM Europa Mk1 (not the Europa B) 2 metre transverter that goes with an FT101ZD MK0, also recently restored.

I need to replace a capacitor to complete the job, but the original (well, not really original, but a previous user's bodge replacement) was a polystyrene type that has melted and the value can not be ascertained.

It's the coupling capacitor that goes between the collector of the 2N3866 local oscillator amplifier and the link coil that feeds the Tx mixer valve. Does anybody know the value? Probably less than 50pF, and I'd expect it to be ceramic.

Before anybody asks, yes I am aware of the limitations of these old transverters and I know the MOSFET Rx converter is probably deaf by design.... although the valve Tx converter is probably no worse (and may be better) than a lot of solid state types still in use.

I have drawn out the complete circuit diagram, but if anyone has a scan of an original, and any other documentation, I'd be interested in a copy.

dodgy-dxer · 25th Sep 2016, 9:01 am

Hi Dave

I do have a paper copy "somewhere", and a 2m Europa in the loft.

My shack and home office is in boxes at the moment as we built an extension (to house more "good stuff"). It is almost finished and will be unpacking in the next few weeks

Hopefully we will be able to have a QSO once I get my SB102 and SB500 running

73 Fred
G4BWP

Quote:

Originally Posted by m0cemdave

I have drawn out the complete circuit diagram, but if anyone has a scan of an original, and any other documentation, I'd be interested in a copy.

dodgy-dxer · 25th Sep 2016, 11:48 am

Dave

Mr Google found a previous discussion on the Europa on this board with a link to get the documentation!

https://www.vintage-radio.net/forum/...ad.php?t=61204

http://www.mods.dk/manual.php?brand=_other

You need to register but it is free

73 Fred

dodgy-dxer · 25th Sep 2016, 11:51 am

Quote:

Originally Posted by m0cemdave

Probably less than 50pF, and I'd expect it to be ceramic.

30pf

m0cemdave · 25th Sep 2016, 10:07 pm

Hi Fred, many thanks for the info. Fortunately I have some 30pF ceramics in stock so all should be well.

G3VKM_Roger · 26th Sep 2016, 8:43 am

I have a scan of the original manual for the Europa B model, if that's any use?

73

Roger

m0cemdave · 26th Sep 2016, 12:55 pm

Hello Roger. I'll send you a PM.
Cheers,
Dave

GMB · 26th Sep 2016, 4:50 pm

It's 30pF

m0cemdave · 26th Sep 2016, 7:10 pm

Thanks to all for the replies.
Two votes for 30pF and the circuit diagram from Roger all agree... capacitor duly fitted.

25th Sep 2016, 1:36 am	#1
m0cemdave Octode Join Date: Feb 2009 Location: Bletchley, Buckinghamshire, UK. Posts: 1,218	SSM Europa Transverter I am restoring an old SSM Europa Mk1 (not the Europa B) 2 metre transverter that goes with an FT101ZD MK0, also recently restored. I need to replace a capacitor to complete the job, but the original (well, not really original, but a previous user's bodge replacement) was a polystyrene type that has melted and the value can not be ascertained. It's the coupling capacitor that goes between the collector of the 2N3866 local oscillator amplifier and the link coil that feeds the Tx mixer valve. Does anybody know the value? Probably less than 50pF, and I'd expect it to be ceramic. Before anybody asks, yes I am aware of the limitations of these old transverters and I know the MOSFET Rx converter is probably deaf by design.... although the valve Tx converter is probably no worse (and may be better) than a lot of solid state types still in use. I have drawn out the complete circuit diagram, but if anyone has a scan of an original, and any other documentation, I'd be interested in a copy.

25th Sep 2016, 11:48 am	#3
dodgy-dxer Heptode Join Date: Mar 2008 Location: Newmarket, Suffolk, UK. Posts: 612	Re: SSM Europa Transverter Dave Mr Google found a previous discussion on the Europa on this board with a link to get the documentation! https://www.vintage-radio.net/forum/...ad.php?t=61204 http://www.mods.dk/manual.php?brand=_other You need to register but it is free 73 Fred

25th Sep 2016, 10:07 pm	#5
m0cemdave Octode Join Date: Feb 2009 Location: Bletchley, Buckinghamshire, UK. Posts: 1,218	Re: SSM Europa Transverter Hi Fred, many thanks for the info. Fortunately I have some 30pF ceramics in stock so all should be well. Last edited by m0cemdave; 25th Sep 2016 at 10:13 pm.

26th Sep 2016, 8:43 am	#6
G3VKM_Roger Heptode Join Date: Jun 2012 Location: Southeast Norfolk, UK. Posts: 773	Re: SSM Europa Transverter I have a scan of the original manual for the Europa B model, if that's any use? 73 Roger

26th Sep 2016, 12:55 pm	#7
m0cemdave Octode Join Date: Feb 2009 Location: Bletchley, Buckinghamshire, UK. Posts: 1,218	Re: SSM Europa Transverter Hello Roger. I'll send you a PM. Cheers, Dave

26th Sep 2016, 4:50 pm	#8
GMB Dekatron Join Date: Aug 2003 Location: near Reading (and sometimes Torquay) Posts: 3,093	Re: SSM Europa Transverter It's 30pF

26th Sep 2016, 7:10 pm	#9
m0cemdave Octode Join Date: Feb 2009 Location: Bletchley, Buckinghamshire, UK. Posts: 1,218	Re: SSM Europa Transverter Thanks to all for the replies. Two votes for 30pF and the circuit diagram from Roger all agree... capacitor duly fitted.