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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)



3/3/2014 9:06:39 AM (2 comments) Add a commentAdd Comment

Over the past week or so I have been working on a 4 transistor solid state rig for 20M. It is mainly a CW rig but I wanted AM function available if need It is finished now. A Hartley osc tuned by slog tuned coil runs whenever the tx is on. That drives a buffer which drives a driver transistor which is where the key is. The Driver and PA transistor are keyed together and the Am function is by way of an old style carbon mic inserted in the key circuit of needed. Output is around 4 to 5 watts. It is built in $-store tin recipe box. I use it around 14050 to 14060khz as time permits. I build a bit of solid state stuff so I don't forget how but I LOVE TUBES!

Read the 2 comments after the break below.


by CT1BWW 3/3/2014 4:03:39 PM

Hi Don.

Wher i found the schematic? I also llike to built some QRP's. I made my own PCB's.
73s frm Marq ct1bww

by VE3LYX 3/4/2014 1:26:49 PM

Hi Marq,
I just built it from my head, no schematic.
I built a Hartley oscillator with a mps102 fet,
fed that through a 56pf capacitor to a 2n3725 NPN transistor (any will work) I bised it with a 68K top to collector and a 22k ground to 68K where the base is connected (56 pf comes there too. )
That feeds a coil from the collector to the B+ The coil has about 36 turns and is about 1.25 cm diameter. A ten turn coil at the one end feed the base of the driver transistor through a 56 pf cap and grounded on the other end. The driver feeds a power transistor through another 56pf cap. Both emmiter leads for the driver (C1760) and power output transistor (C2029) have a low voltage lightbulb. (like a 40 47 52 etc)A small ohm value resistor could also be used. and they are both bypassed to ground with a .0015 cp. The power transistor feeds a T network same diameter as Osc coil but two ten turn coils separated by about .5cm. A tuning capacitor from an old transistor radio tunes the to from the centre (where the space is) to ground. It tunes both coil sections and makes a tuneable but reasonably broadband circuit. It goes to the antenna through a .01 capacitor. The B+ to the two power transistors (driver and Power output) are keyed with the CW key. A carbon mic from an old telephone can be substituted for the CW Key and some pretty good AM comes out when you speak.

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