Doug, that is much more power than I had hoped to get.
I am unsure about the max. values for the 6v6, therefore I stayed low.
When I increase the plate voltage to 325V my 2. grid runs about 280V and the
plate current increases to about 65 mA. I don't really dare to do that
without knowing the max values on that tube.
I guess I could lower the 2. grid voltage by increasing the value of the
resistor connectd to it.
I don't know if that would lower my plate current to what you get.
And yes I have a few 807's lying around, so eventually I could build
something more powerful, but at this point I need to work on my code,
otherwise all of this is a mute point.
You are right about monitoring the CW, it spills over to my receiver and I
can monitor it there, even if I run the transmitter with a dummy load.
So eventually I guess I could just use an arrangement that on transmitt I
would automatically shorten out my receivers antenna.
Hate to use a computer chip (for example) to do it though, I will have to
look for a lower tech way to accomplish this switching.
regards Uwe
in article
, Troglodite at
wrote on 3/12/04 08:36:
I run my 6V6's at about 325 volts on the plate, 250 on the screen. The plate
is
loaded to about 40ma, which is about 13 watts input. You can push it beyond
this, but there's really no point since you have to quadruple your power to
gain one S unit on the receiving end. You'll get about 8 watts out which is
fine. If you want something heftier, you can go to a 6L6, 807 or 6146 tube.
There is a compromise with single tube transmitters though, as the power goes
up they tend to chirp, that is, the frequency slides a bit as they are keyed.
It's not objectionable on the 6V6 transmitters, which is why I favor this
power
level.
I started out in 1954 with a surplus ARC-5 receiver and a simple 6V6
transmitter. With it I gained code proficiency and managed to work 28 states
before my Novice licence expired. (They were only good for a year back then.)
For monitoring, you can just use your receiver with the antenna disconnected,
or you can construct any number of monitor devices which you will find in the
ARRL handbook. You can get more sophisticated but you don't have to. There is
a
special satisfaction in communicating with very simple equipment.
Doug Moore KB9TMY