Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id wBVLV5K8008607 for ; Mon, 31 Dec 2018 22:31:07 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ge53a-00086i-Ly for rs_out_1@blacksheep.org; Mon, 31 Dec 2018 21:25:06 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ge539-00086X-UP for rsgb_lf_group@blacksheep.org; Mon, 31 Dec 2018 21:24:39 +0000 Received: from smtp1web.tin.it ([212.216.176.195]) by relay1.thorcom.net with esmtp (Exim 4.91_59-0488984) (envelope-from ) id 1ge537-0004Q1-Q0 for rsgb_lf_group@blacksheep.org; Mon, 31 Dec 2018 21:24:38 +0000 Received: from feu15 (10.192.64.25) by smtp1web.tin.it (8.6.060.43) id 5AB0B63D0726F4A7 for rsgb_lf_group@blacksheep.org; Mon, 31 Dec 2018 22:24:32 +0100 Received: from (87.12.12.26) by webmailtin.pc.tim.it; Mon, 31 Dec 2018 22:24:32 +0100 Message-ID: <16806276907.marcocadeddu@tin.it> Date: Mon, 31 Dec 2018 22:24:32 +0100 (CET) From: "marcocadeddu@tin.it" To: Mime-Version: 1.0 X-Originating-IP: 87.12.12.26:1928 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. 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Content preview: Paul, I never seen the FT 2000 so made a search on the web for the manual hoping to find a feature like my old TS950.. but unfortunately found no provision for an external frequency reference (in my TS950 t [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.216.176.195 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (marcocadeddu[at]tin.it) 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: e57013951ca4c86ddcf48e741efd2b78 Subject: R: LF: Re: Bad news / help request Content-Type: multipart/alternative; boundary="----=_Part_11573_27933581.1546291472651" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false ------=_Part_11573_27933581.1546291472651 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Paul, I never seen the FT 2000 so made a search on the web for the manual hoping = to find a feature like my old TS950.. but unfortunately found no provision = for an external frequency reference (in my TS950 there is the possibility t= o feed 10 kHz external reference) so the only chance on my opinion is to re= place the original TCXO with another oscillator maybe GPS or Rb disciplinat= ed.. or find the internal reference derived from the divided TCXO (probably= in the range 1=C3=B710 kHz) and switch to a suitable stable external refer= ence. Of course on a quite new generation transceiver this could be almost a surg= ical operation :-( but maybe the Yaesu designer although didn't make availa= ble a simple external jack.. didn't squeeze this vital part in no accessibl= e area. HNY Paul HNY LF&MF Marco, IK1HSS ----Messaggio originale---- Da: paul@n1bug.com Data: 31-dic-2018 16.54 A: "rsgb_lf_group@blacksheep.org", "rsgb-lf-g= roup@groups.io", "Discussion of the Lowfer (US, Eu= ropean, & UK) and MedFer bands", "600MRG@mailma= n.qth.net"<600MRG@mailman.qth.net> Ogg: 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. >=20 > 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. >=20 > I can think of several ways to solve this but am not sure any of > them can save some part of this winter season: >=20 > 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! >=20 > 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. >=20 > 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. >=20 > 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. >=20 > 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. >=20 > 73, > Paul N1BUG ------=_Part_11573_27933581.1546291472651 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: quoted-printable Paul,

I never seen the FT 2000 so made a search on the web for the m= anual hoping to find a feature like my old TS950.. but unfortunately found = no provision for an external frequency reference (in my TS950 there is the = possibility to feed 10 kHz external reference) so the only chance on my opi= nion is to replace the original TCXO with another oscillator maybe GPS or R= b disciplinated.. or find the internal reference derived from the divided T= CXO (probably in the range 1=C3=B710 kHz) and switch to a suitable stable e= xternal reference.
Of course on a quite new generation transceiver this = could be almost a surgical operation :-( but maybe the Yaesu designer altho= ugh didn't make available a simple external jack.. didn't squeeze this vita= l part in no accessible area.

HNY Paul
HNY LF&MF

Marco= , IK1HSS

----Messaggio originale----
Da: paul@n1bug.com
Data: 31-dic-2018 16.5= 4
A: "rsgb_lf_group@blacksheep.org"<rsgb_lf_group@blacksheep.org>,= "rsgb-lf-group@groups.io"<rsgb-lf-group@groups.io>, "Discussion of t= he Lowfer (US, European, & UK) and MedFer bands"<lowfer@mailman.qth.= net>, "600MRG@mailman.qth.net"<600MRG@mailman.qth.net>
Ogg: 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 c= ompleted. I regret I was not able to
> run one night on 630m as plann= ed.
>
> I used a QRP Labs Ultimate 3S beacon transmitter for t= hese tests.
> Yesterday I checked my ability to use JT9-5 for QSOs an= d 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. Wha= t a huge
> disappointment, though it did not come as any surprise.>
> I can think of several ways to solve this but am not sure an= y 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
&g= t; this but I am not convinced I can make enough improvement. The drift
= > is really ugly!
>
> 2. Replace the FT-2000 TCXO with an o= utboard programmable GPS
> referenced oscillator, for example a Leo B= odnar unit. The trouble
> with this is I do not have sufficient knowl= edge or experience to
> know what kind of problems might be encounter= ed. 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 m= uch
> learning left to do and a lot of building. It's probably not a<= br>> 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 l= ast
> solar minimum for me, and I would like to make some LF/MF DX QS= Os
> before these incredible conditions fade away.
>
> 7= 3,
> Paul N1BUG



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