[GreenKeys] WANTED / NEEDED: BOOKS ON TELETYPE

Tue Aug 2 23:23:56 EDT 2011

Hello again fellow Greenkeyers.  I was wondering if any of you have any books on RTTY,  Teletype and or Teletype theory.  I will gladly accept any donation and pay postage. Can anybody recommend a good RTTY book?  New or old?  I need a good list of receiving frequencies as well for my shortwave receiver.  (Hammarlund SP-600) I will also give them a good home and read them

AMATEUR/HAM RADIO COMMUNICATIONS OPERATOR / GENERAL CLASS LICENSED
KD4MPW

AAR4SA

MILITARY AUXILIARY RADIO SYSTEM (MARS)
ASSISTANT DEPUTY EMERGENCY OPERATIONS OFFICER / NORTH ALABAMA

UNITED STATES ARMY MARS REGION 4 (ALABAMA)  

NATIONAL WEATHER SERVICE (HUNTSVILLE, ALABAMA) SEVERE STORM SPOTTER / ADVANCED LEVEL 

E-MAIL: jonkd4mpw at yahoo.com

WHILE ENJOYING THE WONDERFUL HOBBY OF AMATEUR RADIO, I OFTEN ASK MYSELF, DO I WANT TO LISTEN TO SHORTWAVE RADIO.....OR DO I WANT TO CREATE IT?

JONATHAN B. O'REAR  2010

Latitude: 34.866627 (34° 51' 59'' N) 
Longitude: -86.569504 (86° 34' 10'' W) 
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From: "greenkeys-request at mailman.qth.net" <greenkeys-request at mailman.qth.net>
To: greenkeys at mailman.qth.net
Sent: Tuesday, August 2, 2011 4:35 PM
Subject: GreenKeys Digest, Vol 91, Issue 3
Send GreenKeys mailing list submissions to    greenkeys at mailman.qth.netTo subscribe or unsubscribe via the World Wide Web, visit    http://mailman.qth.net/mailman/listinfo/greenkeysor, via email, send a message with subject or body 'help' to    greenkeys-request at mailman.qth.netYou can reach the person managing the list at    greenkeys-owner at mailman.qth.netWhen replying, please edit your Subject line so it is more specificthan "Re: Contents of GreenKeys digest..."Today's Topics:  1. Keyboards to decorate your walls...OT (DR HOUSE)  2. Re: TTY to Ethernet Converter or TTYoIP (John Nagle)  3. patch panel -FREE for postage (Steve Schlink)  4. patch panel -SPOKEN FOR (Steve Schlink)  5. Wobbly FSK ? (Nick England)  6. Re: Wobbly FSK ? (Jim Haynes)  7. Re: Wobbly FSK ? (Nick England)  8. Re: Wobbly FSK ? (Jack)  9. Re: Wobbly FSK ? (WA5CAB at cs.com)  10. Re: Wobbly FSK ? (tony j. podrasky)  11. Re: Wobbly FSK ? (Richard
 Knoppow)----------------------------------------------------------------------Message: 1Date: Tue, 2 Aug 2011 11:18:51 -0500From: DR HOUSE <k9tty at dls.net>Subject: [GreenKeys] Keyboards to decorate your walls...OTTo: greenkeys at mailman.qth.netMessage-ID: <AA921CAE-EFAE-49A1-96AE-6D4F0E40CFAC at dls.net>Content-Type: text/plain; charset=US-ASCII; format=flowedhttp://tinyurl.com/lino-kybds------------------------------Message: 2Date: Tue, 02 Aug 2011 09:33:53 -0700From: John Nagle <nagle at animats.com>Subject: Re: [GreenKeys] TTY to Ethernet Converter or TTYoIPTo: greenkeys at mailman.qth.netMessage-ID: <4E3826F1.1020005 at animats.com>Content-Type: text/plain; charset=ISO-8859-1; format=flowedOn 8/2/2011 9:01 AM, greenkeys-request at mailman.qth.net wrote:> On 01/08/2011 02:42, Keelan Lightfoot wrote:>>> I'm working on a 'TTY to ethernet' converter, that will>>> eliminate the need for a separate computer entirely. The hardware>>> design is complete, and I have all the
 pieces needed to build a>>> prototype, I just haven't had the time to put one together. The>>> hardware will occupy a board about the size of a business card,>>> and will include an Ethernet port for connecting to a network,>>> and a teletype loop connection (reconfigurable as either half>>> duplex or full duplex).>>>>>> My initial design was going to use a Lantronix XPort, which is a>>> serial-to-ethernet converter housed in a slightly oversized>>> through hole ethernet jack. The XPort wasn't capable of anything>>> lower than 300 baud, 8 bit operation, so I was going to include>>> a PIC microcontroller to handle the conversion to 45 baud, 5 bit>>> operation. Then I discovered that the same people that make the>>> Xport also make the XPort 'pro', which is the same hardware, but>>> it runs a tiny Linux OS.>>>>>> I've spent some time poking around the serial driver firmware>>> source, and it supports 5 bit operation out of the box (contrary>>> to the
 XPort documentation), and with a few changes to the>>> firmware, I will be able to add 45.45, 50 and 75 baud operation.    This seems like a good device for that.    Remember to turn the gap time and the buffer size way down.  Thedevice has an accumulation timer, which is, by default, 4 charactertimes.  If you leave it at the default, there will be a delay of 4character times between hitting a key and having it sent.  At 45 baud,that's seriously annoying.    The default buffer size is 2048 chars, and if left at that size,when you interrupt output, you get to wait for the remaining 2048 charsto print.  I went through all this with USB to serial converters.  Itcan all be made to work, but the modern defaults are far too big.             >>> The idea is to allow a teletype to connect to any internet>>> service that supports telnet, including other teletypes. I've>>> also been working on a 'TTYoIP' server that would allow a number>>> of
 teletypes to be connected together on a virtual loop via the>>> internet.    The Xport device, by default, is set up as a client, not aserver. It will need to be reworked so that it initiates connectionsto some external server on its own.  If you can do that, you caneliminate the need for an external computer.                John Nagle------------------------------Message: 3Date: Tue, 02 Aug 2011 14:03:50 -0400From: Steve Schlink <sschlink at mindspring.com>Subject: [GreenKeys] patch panel -FREE for postageTo: greenkeys at mailman.qth.netMessage-ID: <5.2.0.9.2.20110802140202.02704e98 at pop.mindspring.com>Content-Type: text/plain; charset="us-ascii"; format=flowedIf anyone would like this, you can have it for free, just pay the postage.It's 19"http://ebay529.home.mindspring.com/panel_1.jpghttp://ebay529.home.mindspring.com/panel_2.jpgTake care,Steve------------------------------Message: 4Date: Tue, 02 Aug 2011 14:11:50 -0400From: Steve Schlink
 <sschlink at mindspring.com>Subject: [GreenKeys] patch panel -SPOKEN FORTo: greenkeys at mailman.qth.netMessage-ID: <5.2.0.9.2.20110802141110.0264fbc0 at pop.mindspring.com>Content-Type: text/plain; charset="us-ascii"; format=flowedThe patch panel has found a new home.Thanks,Steve ------------------------------Message: 5Date: Tue, 2 Aug 2011 15:43:24 -0400From: Nick England <navy.radio at gmail.com>Subject: [GreenKeys] Wobbly FSK ?To: Greenkeys <greenkeys at mailman.qth.net>Message-ID:    <CAB55hNdjGsYGNK7nqemMWG10Qo6Vif1U+wSJpP+x1bdi0Nw6oQ at mail.gmail.com>Content-Type: text/plain; charset=ISO-8859-1I recently added some info to my site on the KY-30/GRT, an early NavyFSK keyer designed to take RF from a transmitter's oscillator, mix itwith an FSK signal, and send it back to the transmitter foramplification.http://www.navy-radio.com/rtty/ky30grt.htmA description of the TTY input keying voltage which controls thekeyer's local oscillator says "It may also be wobbled at
 about 200cycles per second by turning on the PHASE MODULATION switch. Theamount of phase modulation is varied by adjusting an associated dial.Phase modulation of the transmission may tend to improve receptionunder some conditions of severe selective fading."Was this wobbly phase modulation a common thing back in the day?cheers,Nick K4NYWwww.navy-radio.com------------------------------Message: 6Date: Tue, 2 Aug 2011 15:10:16 -0500 (CDT)From: Jim Haynes <jhhaynes at earthlink.net>Subject: Re: [GreenKeys] Wobbly FSK ?To: Nick England <navy.radio at gmail.com>Cc: Greenkeys <greenkeys at mailman.qth.net>Message-ID: <alpine.LFD.2.02.1108021505560.21897 at Frances>Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCIII've never heard of it before.  What time period do you think this camefrom?  I assume it was back when everybody was using 850Hz shift andfairly wide filters to accomodate drift in the transmitter and receiver.How rapidly does it
 wobble?------------------------------Message: 7Date: Tue, 2 Aug 2011 16:23:22 -0400From: Nick England <navy.radio at gmail.com>Subject: Re: [GreenKeys] Wobbly FSK ?To: Jim Haynes <jhhaynes at earthlink.net>Cc: Greenkeys <greenkeys at mailman.qth.net>Message-ID:    <CAB55hNd7GfBz6Uy0N4Yv9W3Mm=OkMRWHuQCgN1Apzo=CPdoJuA at mail.gmail.com>Content-Type: text/plain; charset=ISO-8859-1Early-mid 1950's - this unit was used to convert really big Navy shorestation CW transmitters to FSK, before the next generation of sidebandrigs started showing up.Commercially it was the Collins 709B-1.The text implies it phase wobbles at 200 Hz.On Tue, Aug 2, 2011 at 4:10 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:> I've never heard of it before. ?What time period do you think this came> from? ?I assume it was back when everybody was using 850Hz shift and> fairly wide filters to accomodate drift in the transmitter and receiver.> How rapidly does it
 wobble?>>>------------------------------Message: 8Date: Tue, 2 Aug 2011 16:06:26 -0500From: "Jack" <wa2hwj at att.net>Subject: Re: [GreenKeys] Wobbly FSK ?To: "'Jim Haynes'" <jhhaynes at earthlink.net>,    "'Nick England'"    <navy.radio at gmail.com>Cc: 'Greenkeys' <greenkeys at mailman.qth.net>Message-ID: <004c01cc5158$118b8570$34a29050$@net>Content-Type: text/plain;    charset="us-ascii"Heck...my Heathkit DX-40 and VF-1 wobbled on RTTY all the time!K0TTY-----Original Message-----From: greenkeys-bounces at mailman.qth.net[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Jim HaynesSent: Tuesday, August 02, 2011 3:10 PMTo: Nick EnglandCc: GreenkeysSubject: Re: [GreenKeys] Wobbly FSK ?I've never heard of it before.  What time period do you think thiscamefrom?  I assume it was back when everybody was using 850Hz shift andfairly wide filters to accomodate drift in the transmitter andreceiver.How rapidly does it
 wobble?______________________________________________________________GreenKeys mailing listHome: http://mailman.qth.net/mailman/listinfo/greenkeysHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:GreenKeys at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html------------------------------Message: 9Date: Tue, 2 Aug 2011 17:20:37 -0400 (EDT)From: WA5CAB at cs.comSubject: Re: [GreenKeys] Wobbly FSK ?To: greenkeys at mailman.qth.netMessage-ID: <69c5.74f6732a.3b69c425 at cs.com>Content-Type: text/plain; charset="US-ASCII"Phase Modulation might or might not be detectible to the ear.  Besides being down at 200 CPS, the phase shift is if I recall correctly typically +/- 180 degrees peak to peak.  Most people couldn't hear any wobble. even on a steady MARK.In a message dated 08/02/2011 16:06:46 PM Central Daylight Time, wa2hwj at att.net writes: > Heck...my Heathkit DX-40 and VF-1 wobbled on RTTY all the
 time!> > K0TTY> > > > -----Original Message-----> From: greenkeys-bounces at mailman.qth.net> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Jim Haynes> Sent: Tuesday, August 02, 2011 3:10 PM> To: Nick England> Cc: Greenkeys> Subject: Re: [GreenKeys] Wobbly FSK ?> > I've never heard of it before.  What time period do you think this> came> from?  I assume it was back when everybody was using 850Hz shift and> fairly wide filters to accomodate drift in the transmitter and> receiver.> How rapidly does it wobble?> Robert Downs - Houstonwa5cab dot com (Web Store)MVPA 9480------------------------------Message: 10Date: Tue, 02 Aug 2011 14:32:59 -0700From: "tony j. podrasky" <tony.podrasky at gmail.com>Subject: Re: [GreenKeys] Wobbly FSK ?To: Green Keys <greenkeys at mailman.qth.net>Message-ID: <4E386D0B.7070307 at gmail.com>Content-Type: text/plain; charset=us-ascii; format=flowedShush!Don't tell anyone that!That was WW II's first method of
 "encryption"...Remember: Lose lips sink ships!UE,W6ESE - tonyNNNNZCZCJack wrote:> Heck...my Heathkit DX-40 and VF-1 wobbled on RTTY all the time!> > K0TTY> -- Tony J. Podrasky | Great truths about life that little children have learned:                  |                  |  "Never hold a Dust-Buster and a cat at the same time"                  |------------------------------Message: 11Date: Tue, 2 Aug 2011 14:35:23 -0700From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>Subject: Re: [GreenKeys] Wobbly FSK ?To: "Nick England" <navy.radio at gmail.com>Cc: greenkeys at mailman.qth.netMessage-ID: <5F6837C3AB404AEFB2738371C0BF44F4 at VALUED20606295>Content-Type: text/plain; format=flowed; charset="iso-8859-1";    reply-type=original----- Original Message ----- From: "Nick England" <navy.radio at gmail.com>To: "Greenkeys" <greenkeys at mailman.qth.net>Sent: Tuesday, August 02, 2011 12:43 PMSubject: [GreenKeys] Wobbly FSK ?>I recently added some
 info to my site on the KY-30/GRT, an >early Navy> FSK keyer designed to take RF from a transmitter's > oscillator, mix it> with an FSK signal, and send it back to the transmitter > for> amplification.> http://www.navy-radio.com/rtty/ky30grt.htm>> A description of the TTY input keying voltage which > controls the> keyer's local oscillator says "It may also be wobbled at > about 200> cycles per second by turning on the PHASE MODULATION > switch. The> amount of phase modulation is varied by adjusting an > associated dial.> Phase modulation of the transmission may tend to improve > reception> under some conditions of severe selective fading.">> Was this wobbly phase modulation a common thing back in > the day?>> cheers,> Nick K4NYW> www.navy-radio.com    I guess that there is a technical paper on this burried away somewhere. I think the idea is to broaden out each mark and space pulse so as to make it less likely it will be completely lost by selective
 fading. As I am sure you know selective fading results when a signal is received via two paths of nearly the same length so that they cause a comb filter effect at the receiver nulling out some frequency. Usually, the path lengths are not very stable so the exact frequency of null moves around plus one or both signals may have regular fading, that is a change in stength over a wide band. By phase modulating the pulse at a fairly high rate, fast, that is, in comparison to its duration, the spectum is widened somewhat which makes it less likely the entire signal will be lost in a null. It is, in effect, a sort of frequency diversity.  I have no idea of how well this works. I have only the vaguest memory of reading something about the theory long ago.    BTW, I fell into your web site last night, what an amazing collection of material:-)--Richard KnoppowLos
 AngelesWB6KBLdickburk at ix.netcom.com------------------------------_______________________________________________GreenKeys mailing listGreenKeys at mailman.qth.nethttp://mailman.qth.net/mailman/listinfo/greenkeysEnd of GreenKeys Digest, Vol 91, Issue 3****************************************