Jim,
I was thinking of back in the 1950's when class-C was used with
amplifiers for CW. I guess the finals were direct-keyed and not
driven by a keyed stage. Its been awhile. My DX-35 used grid-block
keying and ran screen-grid AM on the 6146. But then you youngsters
probably don't go that far back so would not know this. Just yanking
your chain a little, Jim, so don't get all riled up by that statement
(you and I both were licensed in the 50's; ex-K8MWA).
I was thinking that my classic W6PO-8877 was running class-C but in
fact is running linear (probably class-AB). Class-C was used in the
past for higher efficiency when gain was expensive. Now even on
microwaves gain is cheap.
But you missed the point that I am not planning to build a class-C
amp for 630m: "I think its just
simpler to provide class-AB then its a non-issue"; a direct quote of
what I said.
If you look at my original post on this topic: "I am wondering what
kind of interest there would be for a linear amp that could be driven
by the K3s/K3?" No where did I suggest anyone use a class-C
amp. Other's brought up using class-C, D, E.
On 630m spectrum is dear so clean signals are more important than
other bands. Likewise, frequency stability is also required to be a
good citizen on the band. The ARRL Group specifies 1-Hz for both
accuracy and stability. The K3 with TCXO-3 (1ppm) can do that.
I don't have a P3. Guess I would have to use my old frumpy HP141T.
73, Ed - KL7UW
Jim, nice pics on your QRZ.com
----------------------------------
On Mon,7/27/2015 10:43 AM, Edward R Cole wrote:
> CW, JT65, FSK all do fine with class-C, of course.
Ed,
I suggest that you drive a Class C amp with a K3 transmitting CW and
look at the spectra with a P3 both at the output of the rig and at the
output of the amp. Set the P3 display for 5 kHz.
73, Jim K9YC
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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