To: | [email protected], "[email protected]" <[email protected]>, "Discussion of the Lowfer (US, European, & UK) and MedFer bands" <[email protected]>, "[email protected]" <[email protected]> |
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Subject: | Re: LF: Re: [rsgb-lf-group] Bad news / help request |
From: | N1BUG <[email protected]> |
Date: | Tue, 1 Jan 2019 17:33:43 -0500 |
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Hello Rik, Being able to set tone spacing to 100x could help me but I don't think it is worth to do for one person! I have no problem to receive. I don't use the same equipment for Rx and Tx. Only the Tx equipment has drift problems. 73, Paul N1BUG On 1/1/19 4:58 PM, Rik Strobbe wrote: > But this will solve only the TX stability problem, you will still need a > sufficient stable RX! > > 73, Rik ON7YD - OR7T > > ________________________________________ > Van: [email protected] <[email protected]> namens Rik Strobbe > <[email protected]> > Verzonden: dinsdag 1 januari 2019 22:57 > Aan: [email protected]; [email protected]; Discussion of the > Lowfer (US, European, & UK) and MedFer bands; [email protected] > Onderwerp: Re: [rsgb-lf-group] Bad news / help request > > Hello Paul, > > in the current SlowJT9 version double and quadruple tone spacing can be > selected. > If it is of any help I can allow any value for increased tone spacing. > The practical limit will be the TX bandwidth. > But for JT9-5 the signal bandwidth is only 2.6Hz, so anything up to 1000 > should fit within the TX bandwidth. > > 73, Rik ON7YD - OR7T > > ________________________________________ > Van: [email protected] <[email protected]> namens N1BUG > <[email protected]> > Verzonden: maandag 31 december 2018 16:54 > Aan: [email protected]; [email protected]; Discussion of the > Lowfer (US, European, & UK) and MedFer bands; [email protected] > Onderwerp: Re: [rsgb-lf-group] 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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