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Don Dulmage
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VE3LYX Ham Since 1980

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Other Callsigns
First issued VE3LYU

My Ham Radio Interests
Homebrew tubes CW and AM. Minimalist style.
Skeds for low power QSOs with homebrew stuff.

50C6 Cw rockbound with matching 12sn7 regen.
01 TNT 40M with matching 01 regen
40M hartley CW
80M x 40M Am transceiver HB
Two No 19 Wireless Sets
6l6 Breadboard Cw TX and matching 6sl7 regen.
BC454 recvr Operational 80M
ARC 5 T18 transmitter which now covers all of 80M band in CW and AM (cathode modulated through CW key jack)
Twin 811A HB linear Amp.

Other Interests
Speak Deutsch at a functional level, can get by in French but it is hardwork for me.
Make fiddles and play them. (gospel and country)
Drag racer . I run The Senior Dragster. Slant six powered.
I race it at Picton Airfield
Am a writer. I have two books published and many magazine articles in both the USA and Canada. I used to have my own opinion column in a local paper for several years.(View from the Ridge)
Cast aluminum for fun.
Also raised cattle for several years and trucked them. I also bought and sold for others. (Dolmetsch Beef Farm)

In the interest of allowing others to enjoy their clubs I now refrain from joining.(does not play well with others)

Further adventures in Cathode Modulation


3/18/2013 5:02:38 AM (0 comments) Add a commentAdd Comment

>On a whim I experimented with a strictly electro mechanical form of cathode modulation. (no tubes or transistors.) I call it passive cathode modulation. Much to my surprise after sorting through a few values I got it to work. It worked first try but was weak in voice quality. (I tested it on my ARC5)I have since cured that. Seems to work well enough for decent copy but I will test further today as I didn't have a lot of time when I tested it. It was just a whim, one of those "Ok so if that works, I wonder what happens if I try this?" deals. Eliminates almost all the losses caused by inserting and powering a tube from the B- circuit of the PA. Now I need to see how much % I can modulate it that way. 80% is supposedly possible thru cathode control but anything over 30% will be useable. I am going to test it on my 40M TNT (7214kcs 10AM EST))as well to see if it is practical for it.
> > Don VE3LYX

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