Ed,
If you setup a custom TX filter, mine is 1000Hz low and 1800Hz high, you will
get more power out with the VAC TX slider set a lot lower than what you are
running.
The only problem with doing it that way is you can't have TX=RX offset turned on
in JT65-HF, if a station is -400 from you then you just dial the RADIO down to
match. Take your choice, a lot of the operating on JT65 is still locked in to
the
way PSK ops play.....wide filters, click and go and it's not always the best
way.
There's a bunch of radios out there stuck on 14070 :)
Oh and Brian is right JT65 is a weak signal mode not a low power mode. If it was
a low power mode the EME guys would all be running 5 watts. Use the power
needed to hit an RB in your target area with a reasonable signal, the rest of us
can always slide our passbands to eliminate a really loud signal....you gotta
think
outside the PSK box :)
Ron
K0IDT
----- Original Message -----
From: "Ed Wilson" <ed.wil...@ymail.com>
To: "Dave Beumer WØDHB" <d...@w0dhb.net>; <Flexradio@flex-radio.biz>;
<flexra...@yahoogroups.com>
Sent: Thursday, October 20, 2011 11:38 AM
Subject: Re: [Flexradio] VAC and JT65-HF
Dave,
Thanks for the hints.
First of all, the dummy load does not make any difference compared to the antenna
since the VSWR is essentially 1:1 with the antenna.
I did try PSK31 using DM780 and I was able to obtain about 50 watts output with the
ALC reading -3 dB...I believe that I moved the slider up to -3 to obtain this reading.
My transmit filter is 0 to 3K, so I do not think that should be a problem.
Ed, K0KC
________________________________
From: Dave Beumer WØDHB <d...@w0dhb.net>
To: 'Ed Wilson' <ed.wil...@ymail.com>; Flexradio@flex-radio.biz;
flexra...@yahoogroups.com
Sent: Thursday, October 20, 2011 12:23 PM
Subject: RE: [Flexradio] VAC and JT65-HF
Ed
Have you tried to get higher power with other digital modes ?
I can get 60+ watts out on PSK with Drive at 100, ALC level of -3 with
level slider -1 .
Are you certain your xmit filter is not attenuating the output.. have you
tested with a dummy load ?
Dave
-----Original Message-----
From: flexradio-boun...@flex-radio.biz
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Ed Wilson
Sent: Thursday, October 20, 2011 8:50 AM
To: Flexradio@flex-radio.biz; flexra...@yahoogroups.com
Subject: [Flexradio] VAC and JT65-HF
Colleagues,
I have been running JT65A using the JT65-HF software for the past month or
so with good results (several hundred contacts with at least half DX). I
have a Flex-5000 and I am running PowerSDR 2.2.3 under Windows 7/32. I have
set my Drive control to 100 and have adjusted the VAC TX gain for an ALC
reading of -3 dB (-6 on the slider control). With these settings I get from
25 to 30 watts out, depending upon the band. This power output is adequate
for JT-65A, but what if I wanted to run more power? The only way that I can
get my power output into the 100 watt range is to do so by increasing the
VAC TX gain to a value of at least 0 and then the ALC is up to +3 dB, which
probably would create splatter all over the slice of spectrum set aside for
JT65A.
Also, any other suggestions for DSP or other settings that would optimize
J65A operation with PowerSDR would be appreciated.
Thanks,
Ed, K0KC
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