DIY 'manpack'. - UK Vintage Radio Repair and Restoration Discussion Forum

HMV 1120 · 13th Apr 2009, 6:33 pm

Having always wanted, but never been able to afford, my own military valve set for portable HF operating I decided to make my own. The result uses a 12K5 battery valve for 20 meters CW, crystal controlled. The casing is a stripped out SARBE mk.3 distress transciever (VHF). The orange lead is for keying the plate.

Inside the 12K5 is installed upside down, with tank coils and trimming cap to the right and 20MB crystal in the centre. The casing gets warm to touch after 10-15 mins, I have yet to check crystal stability. Everything is mechanically connected and the layout is rigid, inspite of how it looks!

The TX will run from 12-18 vdc (in this case I have connected both filament and plates to the same supply), although operating much above 12 volts will reduce valve life. Output is 1/4-1/2 Watt over this range.

Robs

Edit: will repost photo's once I've worked out how to re-size!

http://i148.photobucket.com/albums/s...DSC_0004-1.jpg

http://i148.photobucket.com/albums/s...DSC_0001-2.jpg

M0AFJ, Tim · 14th Apr 2009, 7:23 am

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Hi, well done with your Tx, looks interesting. Be careful though about the terms of your licence, I think you'll need your intermediate before you can use it.

Cheers
Tim M0AFJ / G8GGP

HMV 1120 · 15th Apr 2009, 6:48 pm

My thanks, yes this is the project for my intermediate licence. for now I can use it my local club (which has better aerials then I do anyway!)
kind regards,

Robs

M0AFJ, Tim · 16th Apr 2009, 9:52 pm

Quote:

Originally Posted by HMV 1120

My thanks, yes this is the project for my intermediate licence. for now I can use it my local club (which has better aerials then I do anyway!)
kind regards,

Robs

Well done chap, look forward to working you soon

Tim

13th Apr 2009, 6:33 pm	#1
HMV 1120 Hexode Join Date: Jan 2007 Location: Weeting, Norfolk. Posts: 465	DIY 'manpack'. Having always wanted, but never been able to afford, my own military valve set for portable HF operating I decided to make my own. The result uses a 12K5 battery valve for 20 meters CW, crystal controlled. The casing is a stripped out SARBE mk.3 distress transciever (VHF). The orange lead is for keying the plate. Inside the 12K5 is installed upside down, with tank coils and trimming cap to the right and 20MB crystal in the centre. The casing gets warm to touch after 10-15 mins, I have yet to check crystal stability. Everything is mechanically connected and the layout is rigid, inspite of how it looks! The TX will run from 12-18 vdc (in this case I have connected both filament and plates to the same supply), although operating much above 12 volts will reduce valve life. Output is 1/4-1/2 Watt over this range. Robs Edit: will repost photo's once I've worked out how to re-size! http://i148.photobucket.com/albums/s...DSC_0004-1.jpg http://i148.photobucket.com/albums/s...DSC_0001-2.jpg __________________ Real radios glow in the dark M6GLD

14th Apr 2009, 7:23 am	#2
M0AFJ, Tim Hexode Join Date: Mar 2006 Location: Helston, Cornwall, UK. Posts: 303	Re: DIY 'manpack'. ------------------------------------------------------------------------ Hi, well done with your Tx, looks interesting. Be careful though about the terms of your licence, I think you'll need your intermediate before you can use it. Cheers Tim M0AFJ / G8GGP

15th Apr 2009, 6:48 pm	#3
HMV 1120 Hexode Join Date: Jan 2007 Location: Weeting, Norfolk. Posts: 465	Re: DIY 'manpack'. My thanks, yes this is the project for my intermediate licence. for now I can use it my local club (which has better aerials then I do anyway!) kind regards, Robs __________________ Real radios glow in the dark M6GLD