James,
a widely used design is to wire the sources together via some resistors,
and get some gain by a following OP-amp. The resistors could be made as
pots to adjust volume.
I built one for my guitar amp, if you look into DIY guitar electronics
you'll find plenty of design ideas.
here is
Oh dear. Of course I know that stuff. BTW, except for very lossy RX antennas
the only thing I know of that gives a "flat" SWR is a dummy load.
The OP said, "My antenna, for 40 mtr's, is a 67' wire up about 25'." Why should
he make a 40-meter dipole so complicated?
Wes N7WS
On 1/16/2019
I have been happy with my SPE 1.3. Most important to me was the ability to
use my 10W K3s or my KX3 to get full output if desired (I never felt the
need use it at 1.3KW on air).
I usually run it at 500-1000W output happily. The multiple antenna/radio
ports are a plus.
It is definitely noisier
You have several choices.
1. Add voltage or current balun at tuner output. Voltage 4:1 is simpler.
2. Connect the ladder line directly but loop the coax by the tuner a few
times around a large toroid. This is equivalent to adding a balun. Do not
ground the tuner.
The first option guarantees
Me, too. Long live the KPA500 ;)
John K7FD
-From: "Raymond Sills"
To: elecraft@mailman.qth.net
Cc:
Sent: Thursday January 17 2019 5:38:58AM
Subject: Re: [Elecraft] SS Amp
HI Gang:
I'm glad that this is not an issue for me. Very happy to be a
HI Gang:
I'm glad that this is not an issue for me. Very happy to be a QRP guy.
73 de Ray
K2ULR
KX3 #211
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Post:
Hi,
just FYI... the articles "Looking for clean SS HF PA w/QSK" in 6 parts on my
blog here:
http://ok1rp.blogspot.com/2018/11/looking-for-clean-ss-hf-pa-wqsk-part-6.html
Talked about:
SPE EXPERT 1.3K-FA
ACOM 1200S
JUMA PA1000
LINEAR Amp Gemini HF-1K
Azden AZR-1000
Elecraft KPA1500
Hi,
just FYI... the articles "Looking for clean SS HF PA w/QSK" in 6 parts on my
blog here:
http://ok1rp.blogspot.com/2018/11/looking-for-clean-ss-hf-pa-wqsk-part-6.html
Talked about:
SPE EXPERT 1.3K-FA
ACOM 1200S
JUMA PA1000
LINEAR Amp Gemini HF-1K
Azden AZR-1000
Elecraft KPA1500
Burst-2000A
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