[Elecraft] Subject: Re: How to outfit a K3 for JT65HF or JT9

[Edward R Cole]

From: Larry Lopez <lawlopez3 at gmail.com>
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] How to outfit a K3 for JT65HF or JT9
Message-ID: <1398112561934-7587639.post at n2.nabble.com>
Content-Type: text/plain; charset=us-ascii

But what about EME.
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I run my K3 in DATA-A which sets the radio to USB standard bandwidth 
(I have the 2.8-KHz 8-pole filter).  I leave the bandwidth at 
2.8-KHz, though I could widen it to 4-KHz.

JT65 EME operation is centered on 1-KHz frequency steps (you could 
call them channels) from 144.100 to 144.170 MHz, so there is really 
no need to use 4-KHz unless you want to watch an adjacent 
frequency.  AFAIK no one corrects for Doppler when running 2m-eme 
with JT-65, since you can see the signals in the waterfall.  If you 
cannot see them, they are probably too weak to work.

One does not use JT65-HF on eme rather you use JT65B for 2m-eme.  I 
think JT65A is used on 6m-eme and JT-65C on 1296.

I have no nearby eme stations that would require a narrowed roofing 
filter.  JT65 imposes a digital filter to maximize sensitivity.  If 
you have many eme stations close in frequency the "Freeze" mode 
allows you to narrow the decoder window in bw.  IN extreme pileups I 
often go to 20-Hz to decode the desired signal and exclude others.  I 
have experienced up to seven stations calling on my frequency at one 
time.  I do not use the roofing filters for this, use the  sw filter 
in JT65 (the tol window).

In the past year I have switched to using MAP65 on 2m-eme, which 
permits watching up to 90-KHz of the band and decodes any JT65 signal 
running eme within that wide window.  MAP65 has a secondary window 
that looks just like what you see on JT65.  When you click the 
display of a signal the small window centers on that frequency and 
the decoder uses that bandwidth to select stations to work.

73, Ed - KL7UW
I've not tried JT9, yet.



73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
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