First decode with SlowJT9 (albeit JT9-1) :
474.2 kHz + 1306 Hz audio:
1814 -22 0.1 1306 1 CQ SV8CS KM07
hny,
Wolf .
On 31.12.2018 18:21, SV8CS-Spiros Chimarios wrote:
Hi to all.
Now I found my problem with the transmission with JT9-5.
The Yaesu FT-2000 is completely unstable.
The Yaesu FT-485 the same.
The Kenwood TS-2000 super stable.
The Icom IC-756 also stable.
So, now I switched to Kenwwod TS-2000 ad I can transmit JT9-5 very well.
NOW CW JT9-5 474.2 KHz 1st cycle.
Reports or answers are welcome.
73, HNY
Spiros/SV8CS
-----Original Message----- From: N1BUG
Sent: Monday, December 31, 2018 15:54
To: [email protected] ; [email protected] ;
Discussion of the Lowfer (US, European, & UK) and MedFer bands ;
[email protected]
Subject: LF: Re: Bad news / help request
Duh! Scratch item 3. Of course that won't work as it will destroy
the JT9 tone spacing!!
Paul
On 12/31/18 8:59 AM, N1BUG wrote:
So, the latest SlowJT9 test is completed. I regret I was not able to
run one night on 630m as planned.
I used a QRP Labs Ultimate 3S beacon transmitter for these tests.
Yesterday I checked my ability to use JT9-5 for QSOs and found that
I have none! My FT-2000 transceiver has too much drift to be of any
use on JT9-5 and is very marginal even for JT9-2. What a huge
disappointment, though it did not come as any surprise.
I can think of several ways to solve this but am not sure any of
them can save some part of this winter season:
1. Add insulation and a heater to the FT-2000 TCXO area. I will try
this but I am not convinced I can make enough improvement. The drift
is really ugly!
2. Replace the FT-2000 TCXO with an outboard programmable GPS
referenced oscillator, for example a Leo Bodnar unit. The trouble
with this is I do not have sufficient knowledge or experience to
know what kind of problems might be encountered. The GPSDO is enough
of an investment to kill any and all other attempts at a resolution
if I am unable to make it work.
3. Use a divide-by-100 circuit with the FT-2000 operating at 13.6
MHz instead of a LO/mixer converter from 10 MHz. This should reduce
drift to the order of 0.1 Hz, probably quite acceptable. So far I
have not found a divide-by-100 circuit using a modern/available part.
4. Run away from the junk FT-2000 completely, using audio to 136 kHz
converter for Tx and 136 kHz to audio converter for Rx. This is
finally the direction I want to go but there seems to be much
learning left to do and a lot of building. It's probably not a
solution which can be completed in time for this winter season.
If anyone has experience in any of these areas and is willing to
share knowledge, please get in touch with me. This may be the last
solar minimum for me, and I would like to make some LF/MF DX QSOs
before these incredible conditions fade away.
73,
Paul N1BUG
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