Lynmar Engineers

Garey Barrell k4oah at MINDSPRING.COM
Tue Jan 27 13:30:17 EST 2009

Alan -

That is a T/R switch.  There should be a very low value capacitor
connected from the box to the "TUBE" side of the Pi-Net in the
transmitter, and a piece of RG-59 coax coming out of the top of the box
to the receiver antenna input.  Filament and plate power for the 6AH6
comes from the transmitter.

Great little box, instantaneous (QSK) T/R switching with no relay
clacking.  It was originally published in QST, and then sold
commercially by the author, W3DM.

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs

Alan W. Fremmer wrote:
> Fellow Collectors/Restorers,
> Wondering if anyone is familiar with this organization.  A quick  search 
> resulted in the fact that the principals were consulting electrical  engineers.  
> I'm asking because a recent purchase of a homebrew transmitter  based on an 
> October 1951 construction article in QST has, as a modification to  the original 
> design, a small aluminum box with a 6AH6 mounted on top.   Leads from the box 
> exit the chassis to the usual rf type  connector.  Other modifications 
> probably include the ability to plate  modulate the rig.  Uses two 807's and delivers 
> about 60 watts out.
> Any leads greatly appreciated.  Thanks in advance for all help.
> 73, Alan - KB2HEI

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