[digitalradio] Net14/Net28 July 2010 Report
Hi Guys The Net14/Net28 News for July 2010 has been uploaded to www.net14.org.uk . Not a very exciting month with no contacts outside Europe reported for Net14 and nothing at all for Net28. But in the midst of preparing the report on 2nd August TU5KC-14, Didier in the Ivory Coast, appeared on my Net14 map. So here's hoping for better conditions this month. 73 Jim, G0JXN/MB7UXN
Re: [digitalradio] Hellschreiber on-air comparison
Hi Tony, I have often switched from FH to FSK-Hell when working the States from VK via the Long-Path on 20M when conditions are poor. Often switching to FSK was the only way to complete (or even initiate) the QSO and the improvement in copy was often quite dramatic, from very difficult/impossible copy to arm-chair copy. de Laurie, VK3AMA It does seem to make a a substantial difference on long-haul propagation Laurie. Please feel free to send me any screen shots you might have - it's always interesting to see how the different modes print under tough conditions. Thanks, Tony -K2MO On 3/08/2010 10:32 AM, Tony wrote: All, I spent a little time this weekend comparing FSK-Hell to the standard Feld Hell mode. FSK-Hell is a modified version of PSK-Hell which was developed to improve readability over HF. The difference tends to show up more on long-haul paths where signals are more likely to encounter ionospheric distortion. Unfortunately, I didn't find any DX, but I did manage to work a few west coast stations from here in W2. I didn't expect to see much of an improvement since conditions on 20 meters were relatively quite (moderate multi-path fading), but in practice, there was a noticeable difference. Contrast was noticeably improved and the text did stand out more with FSK-Hell than it did with Feld Hel. This is especially true with weak signals. The 105 baud mode allows even more contrast which shows up both on-air and with the path simulator. All in all, FSK-Hell does offer better readability over Feld Hell. Click on the link below to see an on-air and example of how the modes compared. FSK-Hell is available in IZ8BLY's Hellschreiber (FM-Hell), DM780, MixW and Multipsk. http://www37.zippyshare.com/v/71092013/file.html Tony -K2MO http://www.obriensweb.com/digispotter.html Chat, Skeds, and Spots all in one (resize to suit) Facebook= http://www.facebook.com/pages/digitalradio/123270301037522 Yahoo! Groups Links __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Re: [digitalradio] Hellschreiber on-air comparison
On 8/2/2010 9:21 PM, Dave Wright wrote: Also available in Fldigi. Thanks for pointing that out Dave. Tony -K2MO On Aug 2, 2010, at 8:32 PM, Tony wrote: All in all, FSK-Hell does offer better readability over Feld Hell. Click on the link below to see an on-air and example of how the modes compared. FSK-Hell is available in IZ8BLY's Hellschreiber (FM-Hell), DM780, MixW and Multipsk. Dave K3DCW www.k3dcw.net http://www.k3dcw.net __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
[digitalradio] Direct RTTY Generation
A back-to-basics question for once... Is there any modern RTTY datacomms software that gives a single wire digital output for driving an FSK transmitter? Looked in the MultiPSK and MMTTY setup menus and nothing. While I realise there may be little call for such a one-wire drive now (although my not-too-old IC746 will take a RTTY input signal) it does lend itself to simple QRP designs for the less experienced constructor. Andy www.g4jnt.com
RE: [digitalradio] Direct RTTY Generation
Andy, Can you be more specific about the design requirements? Simon Brown, HB9DRV http://sdr-radio.com From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of AC TALBOT
[digitalradio] Re: Direct RTTY Generation
A simple QRP Tx suitable for beginners, for example, is usually the ubiquitous 1 Watt 40m thing for CW that all the magazines and book seem include ad-ad-naueam, built into sweet tins or whatever novel box they can think of. I want to be different, and publish a design for RTTY. A simple varicap across a crystal, needing a bit of applied science with SSB Rx and Spectrogram prog to set the shift - all part of the basic learning process. But to do that needs a way of driving the Tx with a wire that just waggles 1/0 with RTTY data - just like the mechanical teleprinters of old. So long as it does it at 45 or 50 baud and is properly timed (perhaps not so easy using Windoze - could this be why there's nothing out there?) I wanted to steer away from a design that linearly upconverted from a soundcard then filtered and amplified the result.The request was for simple designs for beginners Andy --- In digitalradio@yahoogroups.com, Simon HB9DRV simon.br...@... wrote: Andy, Can you be more specific about the design requirements? Simon Brown, HB9DRV http://sdr-radio.com From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of AC TALBOT
Re: [digitalradio] Re: Direct RTTY Generation
I think my FT-450 does that, just one pin on the CAT port, or the Data port, where is my manual page 74. ve3bdr From: IMR Sent: Tuesday, August 03, 2010 9:34 AM To: digitalradio@yahoogroups.com Subject: [digitalradio] Re: Direct RTTY Generation A simple QRP Tx suitable for beginners, for example, is usually the ubiquitous 1 Watt 40m thing for CW that all the magazines and book seem include ad-ad-naueam, built into sweet tins or whatever novel box they can think of. I want to be different, and publish a design for RTTY. A simple varicap across a crystal, needing a bit of applied science with SSB Rx and Spectrogram prog to set the shift - all part of the basic learning process. But to do that needs a way of driving the Tx with a wire that just waggles 1/0 with RTTY data - just like the mechanical teleprinters of old. So long as it does it at 45 or 50 baud and is properly timed (perhaps not so easy using Windoze - could this be why there's nothing out there?) I wanted to steer away from a design that linearly upconverted from a soundcard then filtered and amplified the result. The request was for simple designs for beginners Andy --- In digitalradio@yahoogroups.com, Simon HB9DRV simon.br...@... wrote: Andy, Can you be more specific about the design requirements? Simon Brown, HB9DRV http://sdr-radio.com From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of AC TALBOT No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3047 - Release Date: 08/03/10 02:35:00
AW: [digitalradio] Re: Direct RTTY Generation
I know that the old hamcom software does this . In rtty and cw mode is sends the data 1:1 out on a serial pin on the rs 232 . I know this exactly as I made a mod in my hamcom modem. In rx the transistor is always set to high so I had to connect the ptt transistor and the fsk transistor in series (connector of one going to emitter of the other . I cutted the ground connection of the fsk transistor and connected that to the collector of the ptt transistor So with that soft you surely can do this The soft runs well in a dosbox (as I know) You wanna go cheap? Take an old laptop with win98 on it A slow one will work okay with it and on the older ones you will have a better chance to find a rs 232 Greetz Dg9bfc On this 2 pages you will find lots of hamsoft for digi modes (also older ones) http://www.xs4all.nl/~nl9222/software.htm http://www.xs4all.nl/~nl9222/digisoft.htm _ Von: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] Im Auftrag von IMR Gesendet: Dienstag, 3. August 2010 13:34 An: digitalradio@yahoogroups.com Betreff: [digitalradio] Re: Direct RTTY Generation A simple QRP Tx suitable for beginners, for example, is usually the ubiquitous 1 Watt 40m thing for CW that all the magazines and book seem include ad-ad-naueam, built into sweet tins or whatever novel box they can think of. I want to be different, and publish a design for RTTY. A simple varicap across a crystal, needing a bit of applied science with SSB Rx and Spectrogram prog to set the shift - all part of the basic learning process. But to do that needs a way of driving the Tx with a wire that just waggles 1/0 with RTTY data - just like the mechanical teleprinters of old. So long as it does it at 45 or 50 baud and is properly timed (perhaps not so easy using Windoze - could this be why there's nothing out there?) I wanted to steer away from a design that linearly upconverted from a soundcard then filtered and amplified the result. The request was for simple designs for beginners Andy --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com , Simon HB9DRV simon.br...@... wrote: Andy, Can you be more specific about the design requirements? Simon Brown, HB9DRV http://sdr-radio.com From: digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com [mailto:digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com ] On Behalf Of AC TALBOT
[digitalradio] Re: Direct RTTY Generation
Simon Just checed the help file of mmtty ''Prepare for FSK'' it uses the COM port to out put the FSK signal .. much the same as CW-type uses the com port for cw tx via a transistor switch , or any of the data software uses the CO port as a T/R switch . I think 'delfi' has the ability to out put a 'fabricated' serial data stream via the com port , may be has a versitile port driver in the package ? G .. from the mmtty help files :- The ground for this FSK signal is pin 5 on the serial DB-9 and pin 7 on the serial DB-25. On the right is the switched output to the FSK input on the radio. With this circuit, when MMTTY sends a space (current off) the transistor switch is open and when it sends a mark (current on) the transistor switch is closed. This same circuit is used for push-to-talk, see Using a Serial Port to Control PTT, but it is connected to different pins on the serial port. --- In digitalradio@yahoogroups.com, Simon HB9DRV simon.br...@... wrote: Andy, Can you be more specific about the design requirements? Simon Brown, HB9DRV http://sdr-radio.com From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of AC TALBOT
AW: [digitalradio] Re: Direct RTTY Generation
And hamcom modem is cheap Just an opamp powerd from the rs232 .. Used as komparator So you need no soundcard ... What about using an si570 for the vfo? And there is a lcd circuit for controlling the si570 . That would give a nice cw psk rtty trx Dg9bfc Sigi _ Von: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] Im Auftrag von Siegfried Jackstien Gesendet: Dienstag, 3. August 2010 16:36 An: digitalradio@yahoogroups.com Betreff: AW: [digitalradio] Re: Direct RTTY Generation I know that the old hamcom software does this . In rtty and cw mode is sends the data 1:1 out on a serial pin on the rs 232 . I know this exactly as I made a mod in my hamcom modem. In rx the transistor is always set to high so I had to connect the ptt transistor and the fsk transistor in series (connector of one going to emitter of the other . I cutted the ground connection of the fsk transistor and connected that to the collector of the ptt transistor So with that soft you surely can do this The soft runs well in a dosbox (as I know) You wanna go cheap? Take an old laptop with win98 on it A slow one will work okay with it and on the older ones you will have a better chance to find a rs 232 Greetz Dg9bfc On this 2 pages you will find lots of hamsoft for digi modes (also older ones) http://www.xs4all. http://www.xs4all.nl/~nl9222/software.htm nl/~nl9222/software.htm http://www.xs4all. http://www.xs4all.nl/~nl9222/digisoft.htm nl/~nl9222/digisoft.htm _ Von: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] Im Auftrag von IMR Gesendet: Dienstag, 3. August 2010 13:34 An: digitalradio@yahoogroups.com Betreff: [digitalradio] Re: Direct RTTY Generation A simple QRP Tx suitable for beginners, for example, is usually the ubiquitous 1 Watt 40m thing for CW that all the magazines and book seem include ad-ad-naueam, built into sweet tins or whatever novel box they can think of. I want to be different, and publish a design for RTTY. A simple varicap across a crystal, needing a bit of applied science with SSB Rx and Spectrogram prog to set the shift - all part of the basic learning process. But to do that needs a way of driving the Tx with a wire that just waggles 1/0 with RTTY data - just like the mechanical teleprinters of old. So long as it does it at 45 or 50 baud and is properly timed (perhaps not so easy using Windoze - could this be why there's nothing out there?) I wanted to steer away from a design that linearly upconverted from a soundcard then filtered and amplified the result. The request was for simple designs for beginners Andy --- In digitalradio@ mailto:digitalradio%40yahoogroups.com yahoogroups.com, Simon HB9DRV simon.br...@... wrote: Andy, Can you be more specific about the design requirements? Simon Brown, HB9DRV http://sdr-radio. http://sdr-radio.com com From: digitalradio@ mailto:digitalradio%40yahoogroups.com yahoogroups.com [mailto:digitalradio@ mailto:digitalradio%40yahoogroups.com yahoogroups.com] On Behalf Of AC TALBOT
RE: [digitalradio] Direct RTTY Generation
AA6YQ comments below. -Original Message- From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com]on Behalf Of AC TALBOT Sent: Tuesday, August 03, 2010 5:46 AM To: digitalradio@yahoogroups.com Subject: [digitalradio] Direct RTTY Generation A back-to-basics question for once... Is there any modern RTTY datacomms software that gives a single wire digital output for driving an FSK transmitter? Looked in the MultiPSK and MMTTY setup menus and nothing. MMTTY provides this FSK signal via the TxD pin of the serial port specified in the PTT FSK panel on the Setup MMTTY window's TX tab. Since using this signal requires a serial port capable of 45 baud operation, which some USB-to-serial-port-adaptors can't do, you can set the PTT FSK panel's port selector to EXTFSK, which displays a window that lets you configure the generation of an FSK signal on a serial port's RTS or DTR pins. In this latter configuration, the timing of the FSK signal is software-generated, and thus less accurate than that generated by a 45 baud serial port. Digital mode applications that use MMTTY as their RTTY Engine -- WinWarbler, HamScope, etc. -- thus offer this capability. While I realise there may be little call for such a one-wire drive now Not true! Modern transceivers provide RX filtering for RTTY that is only availalble when the transceiver is operated in RTTY mode, thus requiring the FSK signal when transmitting. Icom's ic-7200, ic-7600, ic-7700, and ic-7800 all provide a very nice twin-peak filter that is only available in RTTY mode. 73, Dave, AA6YQ
[digitalradio] RTTY parts
A large number of RTTY parts have been put up for sale. If anyone is looking for anything please ask. John, W0JAB Louisiana, Missouri
[digitalradio] World's nastiest PSK31 signal [1 Attachment]
On 10M tonight, from Mexico See attached, the image around 500 Hz is his MAIN signal with LOTS of side bars, and the image around 1700 Hz is also him ! Andy K3UK
Re: [digitalradio] World's nastiest PSK31 signal
On Tue, Aug 03, 2010 at 09:18:20PM -0400, Andy obrien wrote: On 10M tonight, from Mexico See attached, the image around 500 Hz is his MAIN signal with LOTS of side bars, and the image around 1700 Hz is also him ! I don't see an attachment, OM. -- Mike Andrews, W5EGO mi...@mikea.ath.cx Tired old sysadmin
Re: [digitalradio] World's nastiest PSK31 signal
It's NOT an attachment - it's an embedded link. It looks pretty nasty too! Jeff -- KE7ACY - Original Message - From: mikea To: digitalradio@yahoogroups.com Sent: Tuesday, August 03, 2010 6:27 PM Subject: Re: [digitalradio] World's nastiest PSK31 signal On Tue, Aug 03, 2010 at 09:18:20PM -0400, Andy obrien wrote: On 10M tonight, from Mexico See attached, the image around 500 Hz is his MAIN signal with LOTS of side bars, and the image around 1700 Hz is also him ! I don't see an attachment, OM. -- Mike Andrews, W5EGO mi...@mikea.ath.cx Tired old sysadmin
