[1000mp] MPV Driving Amp

[Mike Schatzberg]

Nice going Win:

Interesting how the Collins length of 20.5 feet dropped you well into the
area where there is no danger of power foldback.

I also see that the solution worked as well on 20 meters as it did on 15
meters where the pruning was done.

What we have from your data is that a length of 20.5 feet with the RG 8X
Radio Works cable provides a simple solution to matching the Mark V into
your modified SB 220.  Other people will have to reach their own solution
for their own configuration.

You might let the folks know about how long you had to work on the project
to obtain the solution.  I wouldn't think that it would have been too long.

I have explained this simple system for evaluation to many stations over the
years, but I don't usually get the details about exactly how well it worked.
But I normally do hear that the results were the same as yours.

Thanks for sharing your efforts with the reflector, "One experiment is
indeed worth a thousand expert opinions".

By the way, you might want to check out my website which has an early draft
of an article which will appear in
QST later this year or early next year.  It concerns an improvement for the
Mark V in receiver audio DSP.

I hope to find you soon on 20 meters enjoying your configuration.

73 and Happy DXing,

Mike
W2AJI
http://home.earthlink.net/~cherokeehillfarm/id2.html


----- Original Message ----- 
From: "Win" <w0lz at winlyn.us>
To: <1000mp at mailman.qth.net>
Sent: Monday, October 23, 2006 12:45 PM
Subject: [1000mp] MPV Driving Amp


OK, Mike, and anyone else that is interested, I started with 23 feet of RG8X
Premium Low Loss, FV 78% Center # 16, 1.2 db per 100' at 15 MHz coax from
Radio Works. Drive was 30 watts on 15 meters into a old SB-220 that is
somewhat modified for QSK and 10 meters,among other things.

At 23 feet the SWR was 1.75:1 into the Amp - !,2:1 to the antenna
At 20.5 feet the SWR was 1.15:1 into the Amp _ 1.2:1 to the antenna

The readings in between I am leaving out because I was tired and don't trust
my notes.

With the 20.5 foot cable SWR on 20 and 10 meters into the amp was 1.2;1 into
the amp and 1.2:1 to the antenna.

It works for me.  Thank you very much.

Win
______________________________________________________________
1000mp mailing list
Home: http://mailman.qth.net/mailman/listinfo/1000mp
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:1000mp at mailman.qth.net