[TMC] TMC notes

[telegrapher at q.com]

John, 

I wonder if you have any of the drawings to accompany the notes that you've added to the web site?  As an example there is a mod for the VOX 1&2 to make it like the VOX 4 & 3.  One of the notes in this mod is the replacement or addition of a Cast part for the oscillator chassis.  Other notes are for the change out of connectors.  However there is no information as to what this work is supposed to achieve or why it's being done other than to make it compatable with the VOX 4 & 3.  What were the advantages of making the change?  Did it have to do with Osc. stability or just interconnection compatibility?  Be kind of nice to find drawings associated with the changes to also be able to see where holes are being drilled. along with other concerns.  

I still need to figure out a good way to eliminate the signal being radiated from the VOX ( ) when the transmitter switches back to receive mode.  As it is on a simplex frequency which is how we hams operate anyway the radiated signal from the VOX over powers the receiver.  A simple relay used to lift the coax side to open and terminating the output with a resistor (75 ohms) would do the job i think.  Has anyone thought of doing this or has anyone actually fired their unit up?  I thought i would use mine to drive the Viking II which requires 5-8 V into 10K ohms.

I turned mine on today to get the electrons running around in circles again for a change and am watching the frequency drift as it warms up.  As it has three outputs on the back hooking one to a frequency counter and another to the transmitter allows me to watch the drift while operating.  It's really easy to keep it within a hundred cycles or less and the other AM ops don't even know it's moving unless they have their BFO on.  After a good warmup period it doesn't move more than 100 cyces in either direction so its pretty stable at least for AM use.  Now to figure out how to mod the output to kill the signal when going back into receive.
Control voltage, tie points,mounting of the relay and associated hardware are a few things to consider.

Larry
W0OGH