[ARC5] Model 19 MKll

[Henry Mei'l's]

Re WS19/MkII:
I also key the 807 cathode via the relay - I'm going to adjust the relay 
contact spacing so that the oscillator goes on a bit before 807 cathode 
contacts close.
I still get a slight chirp but will put some VRs on the osc. & 807 sg's --  
if necessary, I  might "step" load the 807 plate supply so that when in 
transmit mode, current drain will be nearly constant on key up / key down .
The A set space could be used for built in PS, a Q-multiplier or even en 
extra PA stage - but that would defeat the QRP quality of the set.
Henry OZ1UF, Cph

----- Original Message ----- 
From: "Donald Sanders" <w4bws at yahoo.com>
To: "ARC5" <arc5 at mailman.qth.net>
Sent: Monday, February 22, 2010 2:51 AM
Subject: [ARC5] Model 19 MKll


Back in 1956 while in High School our radio club advisor, who taught 
mathmatics and Radio theory class, got a model 19 for the club. I took the 
task to get it on the air. We had no manuals just the unit and power supply. 
I quickly found out about the key voltage and traced the wiring to find out 
why. Then promptly installed a keying relay with low coil voltage to the 
key. I traced most of the wiring just to find out how it worked. That was 
practice for many other "reverse Engineering" jobs later.
I was very happy to make contacts with that old girl, almost QRP but lots of 
fun. Yes, I got an A in the radio class.
Don W4BWS


Meyer Gottesman wrote:
I own a Wireless Set 19, Mark II. The "B" set is a rather useless SUPER 
regen or "rushbox" as some hams call it. I find it utterly useless. The "A" 
set can be made into a very nice 80 and 40 CW rig. The 807 grid modulation 
makes AM less than useless but again, a nice CW rig. The screen grid voltage 
on the key is very dangerous and should be rewired to 807 cathode keying. 
The original keying is a non-starter and a real shocker, literally. Hi Hi!

73,

Meyer Gottesman, W6GIV
Macon, GA



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