[Amps] W6PQL Designs

[WT2P - CJ Johnson]

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 at gmail.com>
> *Sent: *Friday, April 28, 2017 9:18 PM
> *To: *k6mr at outlook.com <mailto:k6mr at outlook.com>; amps at contesting.com 
> <mailto:amps at 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 at gmail.com>
>     *Sent: *Friday, April 28, 2017 8:37 PM
>     *To: *amps at contesting.com <mailto:amps at 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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