That's an interesting way of doing it... Have you run into problems with
the rapid switching that occurs when you're doing SO2R? (are you using
it in a SO2R rapid switching environment?)
There's some data to be gathered (on my end) but it's still interesting...
On 4/28/2017 11:51 PM, Ken K6MR wrote:
Yes. I have two KPA500s. I use the splitter to drive both of them on
the same band, and the combiner to put the two outputs back together.
I also have a set of relays that switch the assembly between the two
K3s. I have an Arduino that handles switching band data, keyline,
etc.. It uses the Tx Focus from the u2R to make the amps follow the
active radio. The amps are in the closet, I just watch them using the
Elecraft remote programs. Ditto for the tuners, one per radio.
All of my antennas are fine on cw/rtty, but the 80m antennas get
squirrely above 3650. I hardly ever operate phone so it doesn’t
affect me. The tuners will make them tolerable up to 3750 or so. The
KAT500s are good to 1000W at 3:1. Good enough for me.
As long as the tuner will handle it, the feedline losses are so low on
80 that it’s not worth changing anything. 3 or 4 to 1 isn’t going to
break anything even at 1500W with normal sized coax.
Ken K6MR
*From: *WT2P - CJ Johnson <mailto:fredwt2p@gmail.com>
*Sent: *Friday, April 28, 2017 9:18 PM
*To: *k6mr@outlook.com <mailto:k6mr@outlook.com>; amps@contesting.com
<mailto:amps@contesting.com>
*Subject: *Re: [Amps] W6PQL Designs
Ken-
Did you get the Combiner/Split for an existing amp?
I'm looking at obviously not duplicating the 4O3A design in SO2R amps,
and have been resigned to the fact that i'll probably operate two amps
for SO2R... but I am looking at building at least *one* amp that is SS
for my shack. That is the pinnacle here, of finally operating an amp
that performs well in a contest and being able to say "I
built/assembled it myself". And being able to troubleshoot any faults
that may occur.
There's been a lot of talk about LDMOS amps, and I'm genuinely
curious... I have resonant ants for 40/20, but on 80, my seasonal
antenna is fairly resonant but narrow bandwidth (3.5-3.68) before the
SWR jumps. I've seen some videos of the LDMOS variant amps taking a
3:1 rating (obviously not at RTTY levels) but it has piqued my
interest. Even my 76PA has "appeared" to tolerate my momentary
excursions up to 75M, but I know that the reflected power is just
eating away at the tubes. Probably even more so with transistors.
I know the answer is to get resonant antennas, which I have done.. I'm
impressed with my Alpha 76PA in the fact that it has dealt with me at
3AM mistuning the thing and it still works like a racehorse.
On 4/28/2017 11:00 PM, Ken K6MR wrote:
I bought the combiner/splitter assemblies made by W6PQL for my
dual KPA500 project. High quality boards and they work great. The
amp pallets look like they are the same high quality. I’m just too
lazy to take on a project like that.
He did an update on the filter design that has better harmonic
suppression for the high power model.
Ken K6MR
*From: *WT2P - CJ Johnson <mailto:fredwt2p@gmail.com>
*Sent: *Friday, April 28, 2017 8:37 PM
*To: *amps@contesting.com <mailto:amps@contesting.com>
*Subject: *Re: [Amps] Amps Digest, Vol 172, Issue 92
Can we get back to the topic(s) at hand, namely building/repairing
amps?
I, for one, am very curious about the new SS amp line(s) coming
out and
researching as much as I can about the W6PQL designs and would
like to
hear more about the merits of that design and some advice for budding
builders who want to experiment along that path.
Or is this going to devolve into an online version of 7.200?
Thanks,
WT2P
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