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 <36F7EF7F685543D6B4D350C921AE417E@SV8CSQTH>
From: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= <dl4yhf@freenet.de>
Message-ID: <058ba244-bcf9-b61e-9ac2-03a15eab03c7@freenet.de>
Date: Mon, 31 Dec 2018 19:19:09 +0100
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Subject: Re: LF: SV8CS : Good news
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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: 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 
>
>