[Elecraft] k2/100 + rtty

[Charles Greene]

Hi,

I use MMTTY with N1MM Logger on RTTY and it works very well.  I use the 
normal filters I have set up for PSK31.  They are centered at 1000 Hz, so I 
adjust the frequency in MMTTY to be centered in these filters.   It works 
out to be 915/1085 Hz.  One of the filters is 500 Hz wide, so I use that, 
or else the next wider one.  I have the DSP filters centered at  the same 
audio frequencies and the same bandwidth as the xtal filters, and they work 
well too.  If I try to use 2125/2295, they are way out of range of the K2 
audio spectrum.  You can readjust the K2 filters if you want to use 
2125\2295 but you may have trouble getting that high frequency, but I see 
no reason to not use 915/1085.  There are no spurious responses if you 
operate in the linear mode. I set the power about 75 watts on the K2/100 
and about 10 watts on the K2 and advance the audio level using a pot in the 
interface until I get 50 watts,  watts on the K2, output.  You probably can 
go higher, but the finals get pretty hot even with a little fan on the heat 
sink, and the power level is only 3 dB down from max at 50 watts.  The 
efficiency is higher than the two tones of PSK31, but the finals still get 
hot on continuous duty.   I only operate at 30 watts (5watts on the K2) on 
PSK31 and the other digital modes.

At 08:42 AM 1/7/2004, PA3EWP, Ronald wrote:
>Hello,
>
>
>
>Have someone experience with the K2 and RTTY?
>
>I had some problems this weekend.
>
>
>
>I use writelog in combination with MMTTY. So I use a soundcard from my
>laptop.
>
>
>
>1) First the smallest filter on the K2 in RTTY mode. I can select is 1.6
>Khz, that is too width. Normally I like to listen to 500 Hz and when its
>extremely big mesh 250 hz.
>
>
>
>2) I can only tune en decode signals when I listing at 2.0 Khz or more.
>
>
>
>In the past I used always a DXP38 and the radio a FT1000MP.
>
>Any signal was tuned in within seconds, but now it's hopeless.
>
>
>
>Now connecting the FT1000MP and Writelog/MMTTY it works fine, RX on 500 or
>250 hz, but the weakest signals are coming in.
>
>
>
>So what can I adjust on the K2 to get it working?
>
>
>
>
>
>
>
>
>
>Ronald Stuy, PA3EWP
>
>
>
>member:
>PI4COM (Contestgroup Oude Maas)
>http://www.qsl.net/pi4com
>
>
>
>LLDXT (Low Land DX-pedition Team)
>http://www.qsl.net/lldxt/index.html
>
>
>
>Banaba Island DX-pedition 2004
>http://www.dx-pedition.de/banaba2004
>
>
>
>
>
>
>
>
>
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73, Chas,  W1CG
K2 462b, 3571