Your PA is fine.
The amount of drive is dependent on the AF gain being fed from the
digital mode program. If it is not putting out 0 dB, then a VAC TX gain
setting of 0 dB will not produce very near 100 watts PEP with a tone.
You ALWAYS want to use DIGx modes for digital mode operation because it
bypasses all of the voice signal processing (EQ, compander, leveler)
that can adversely effect the AF generated by the digital mode program.
You also NEVER want to exceed 0 dB on ALC, as this is "clipping" the DSP
and that is never good for digital modes. I never exceed -1 dB to allow
for some headroom. With Fldigi, I get 90W out on PSK31 with the VAC TX
Gain = 0
Tim Ellison
On 10/20/2011 3:27 PM, Ed Wilson wrote:
Dave,
I can get 100 watts out in the tune mode (and CW when I use that mode).
Ed, K0KC
________________________________
From: Dave Beumer WØDHB <d...@w0dhb.net <mailto:dave%40w0dhb.net>>
To: 'Ed Wilson' <ed.wil...@ymail.com <mailto:ed.wilson%40ymail.com>>;
Flexradio@flex-radio.biz <mailto:Flexradio%40flex-radio.biz>;
flexra...@yahoogroups.com <mailto:FlexRadio%40yahoogroups.com>
Sent: Thursday, October 20, 2011 2:48 PM
Subject: RE: [Flexradio] VAC and JT65-HF
Ed
When I get a chance later today I’ll see the max power I can get out
of JT65 alc -3 drive slider 100 into a dummy load.
Have you tested your max power out hitting “TUN” and running Drive to
100 ? Maybe your overall output power is low.
Dave
From:Ed Wilson [mailto:ed.wil...@ymail.com
<mailto:ed.wilson%40ymail.com>]
Sent: Thursday, October 20, 2011 10:39 AM
To: Dave Beumer WØDHB; Flexradio@flex-radio.biz
<mailto:Flexradio%40flex-radio.biz>; flexra...@yahoogroups.com
<mailto:FlexRadio%40yahoogroups.com>
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 <mailto:dave%40w0dhb.net>>
To: 'Ed Wilson' <ed.wil...@ymail.com <mailto:ed.wilson%40ymail.com>>;
Flexradio@flex-radio.biz <mailto:Flexradio%40flex-radio.biz>;
flexra...@yahoogroups.com <mailto:FlexRadio%40yahoogroups.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-bounces%40flex-radio.biz>
[mailto:flexradio-boun...@flex-radio.biz
<mailto:flexradio-bounces%40flex-radio.biz>] On Behalf Of Ed Wilson
Sent: Thursday, October 20, 2011 8:50 AM
To: Flexradio@flex-radio.biz <mailto:Flexradio%40flex-radio.biz>;
flexra...@yahoogroups.com <mailto:FlexRadio%40yahoogroups.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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