> No lectures on low power for JT, I run power depending on
> propagation, or lack thereof, mostly on a dead six meter band.
Note that JT65 and JT9 are designed to be suitable for saturated
amplifiers as there is only a single tone at a time and one tone
ramps down before the next tone ramps up. *DO NOT* try running
PSK, MFSK, etc. modes at 600W average power from a KPA-500 as you
will be generating serious IMD and garbage.
Depending on the crest factor (peak to average ratio) of the mode
in use, the average power from the KPA-5000 should be kept 6 to 10
dB below the rated maximum (e.g., 60 to 150 watts) just as a 100W
transceiver should be kept between 10 and 25 watts average.
73,
... Joe, W4TV
On 2014-11-10 6:56 PM, mcduf...@ag0n.net wrote:
On Mon, 10 Nov 2014 09:34:09 -0800, Jim Brown wrote:
During KPA500 beta, I was loaned one for a major RTTY contest weekend
and told to run it "with all the lights lit." I did, and it worked fine.
In the 3-4 years I've owned one, I regularly run it at full power in
digital modes on all bands, 160-6M. When it gets warm, the fan speeds
up, but it continues to put out full power. This includes digital modes
like FSK441 and JT65A on 6M, and lots of RTTY on the HF bands.
I'm not a contester, but have done similar with mine with no issue. The fan
will scream at you as it gets above 70C, but the temp levels out. I'm not one
to push much beyond that, as that's all the warmer it gets in JT exchanges
running power. No lectures on low power for JT, I run power depending on
propagation, or lack thereof, mostly on a dead six meter band.
Gary
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to li...@subich.com
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
