Message-ID: <36F7EF7F685543D6B4D350C921AE417E@SV8CSQTH>
From: "SV8CS-Spiros Chimarios" <zante@otenet.gr>
To: <rsgb_lf_group@blacksheep.org>
References: <837ccf97-5020-0ed3-b67e-966df3020851@n1bug.com> <dc5ca2b8-b777-1132-67cf-c0d6044bd3b7@n1bug.com>
In-Reply-To: <dc5ca2b8-b777-1132-67cf-c0d6044bd3b7@n1bug.com>
Date: Mon, 31 Dec 2018 17:21:46 -0000
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Subject: LF: SV8CS : Good news 
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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: rsgb_lf_group@blacksheep.org ; rsgb-lf-group@groups.io ; Discussion of 
the Lowfer (US, European, & UK) and MedFer bands ; 600MRG@mailman.qth.net
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