[digitalradio] Hellschreiber History

[Pete Kemp]

Interested in Hellschreiber History? While exploring eBay  I found 
the following item being offered for sale.  I am NOT connected with 
this sale in any way.
73,
Pete, KZ1Z
FH# 8:

---

1927 Picture Transmission Fax Invention, Rudolf Hell

Item number: 150230791145

---

Bildfunk
(Picture Transmission)
Anleitung zum Selbstbau eines Bildempfaengers
(Guide for Building Picture Receivers)

by

Rudolf Hell

Die Radio-Reihe/Band 21

Schmidt, Berlin, 1927. In German.
Black hard covers with white lettering, octavo, 114 pages, 80 b&w 
photographs, schematic diagrams and illustrations

Very scarce book by the prominent German engineer and inventor of the 
first facsimile transmission apparatus as well as many other 
inventions in radio technology and other fields. This book describes 
his invention of the Hellschreiber.

Rudolf Hell developed technology that led to the fax and the color scanner.

Hell's landmark invention was a machine for transmitting text that 
electronically broke up letters into a stream of dots reassembled at 
the receiving end, in effect the first telefax.

The commercial success of his 1929 "Hell Recorder" allowed him to 
found his own company.

The technology was less prone to poor reception than telex 
transmissions, making Hell's machines popular for news agencies, the 
post office and police departments. In the 1920s, he also invented an 
image scanning tube for televisions and a radio-beam flight-path 
finder that is considered a forerunner of aircraft autopilots.During 
World War II in Nazi Germany, Hell worked on encoding machines. After 
the wartime destruction, he resumed business in 1947 and came up with 
inventions that revolutionized the graphic arts.

An electronically controlled engraver unveiled in 1954 made photo 
publishing easier for newspapers, and an early version of the color 
scanner followed in 1963. Hell also was a pioneer of electronic 
digital typesetting in the 1960s, which ushered out the traditional 
method using lead.

Hell sold his Kiel-based company in 1981 to German industrial giant 
Siemens. It was later merged with Linotype AG to become Linotype-Hell 
AG, which in turn was taken over by German printing press maker 
Heidelberger Druckmaschinen in 1996.

Rudolf Hell (December 19, 1901 March 11, 2002) was a German inventor.

He was born in Eggm??hl, Bavaria, Germany.From 1919 to 1923 he 
studied electrical engineering in Munich. He worked there from 1923 
to 1929 as assistant of Prof. Max Dieckmann, with whom he operated a 
television station at the Verkehrsausstellung (lit.: Traffic 
exhibition) in Munich in 1925. In the same year Hell invented an 
apparatus called the Hellschreiber, an early forerunner to the fax. 
Hell received a patent for the Hellschreiber in 1929.

In the year 1929 he founded his own company in Babelsberg, Berlin. 
After World War II he re-founded his company in Kiel. He kept on 
working as an engineer and invented machines for electronically 
controlled engraving of printing plates and an electronic photo 
typesetting system called digiset.

He has received numerous awards such as the Knight Commander's Cross 
of the Order of Merit of the Federal Republic of Germany, the 
Gutenberg Prize awarded by the City of Mainz and the Werner von Siemens Ring.

His company was taken over by Siemens AG in 1981 and merged with 
Linotype in 1990, becoming Linotype-Hell AG.He died in Kiel, Germany. 
(Wikipedia)Condition: Good+ (Covers have minor shelfwear. Title page 
has name and date in pencil, triangular piece cut from the lower 
corner. Foreword page has creases and repair at gutter margin (with 
no loss of text). Text and illustrations are otherwise intact and 
clean. Binding is tight.)

[digitalradio] Re: SSTV VK - EU Tests on 7.033Mhz Update on Results

[Pete]

--- In digitalradio@yahoogroups.com, "Pete" <[EMAIL PROTECTED]> wrote:
>
> I am new to this group and it appears to be where I might find
> operators  with a similar interest, most of my activity is focused 
on
> MMSSTV DX and  propagation tests. The last year I have focussed 
mainly
> on 14.230 and LP to US and SP to EU.
> 
> This Winter in VK I am looking for operators in EU region interested
> in SSTV on 7.033Mhz.
> 
> Equipment will be a TS430S and Emtron DX-2 amp with a 40m Inverted V
> Horizontal polarisation is oriented to EU. I have run some tests 
with
> PE2SWL webcam over last week and have managed some RX pics on a 20m
> antenna at his location so the path is feasible.
> 
> Over next week I intend to add a wire Reflector behind the Inverted 
V
> to lower the angle of radiation from 70 Degrees to 26 Degrees.
> 
> Also interested in EasyPal tests on 7.033Mhz but I am less familiar
> with  this software on DX paths.
> 
> Any takers, The best opening to EU seems to be between 20-21 UTC I
> will endeavour to be there most days my website will announce if my
> station and webcam are operating
> 
> http://users.tpg.com.au/adslsymb/VK6AAL/
> 
> Look forward to any contacts, all the best and GD DX.
>

ZS2ABF was seen on 40m 2 nights ago a bit early best time for EU 
between 17 UTC and 18 UTC a few of stations worked can be seen at 
http://users.tpg.com.au/adslsymb/VK6AAL/40m/40mpix.html

The vertical lines are the Chinese Radar that gets up to S9 here this 
can be managed using a very aggressive modified Noise Blanker and 
stations have been worked through it.

I will be on 7.033 most week nights this winter to work as many EU 
stations on 40m as I can, weekends there is too much CW QRM S9 in EU, 
I added a Reflector to the Inverted V for 40m gives me a 2 ele 
antenna for EU on 40m interested in any signal reports it should 
still be wide enough to cover SA + EU with gain and back lobe reaches 
ZL worked ZL2SY on his OCF. Pattern of lobes can be seen at 
http://users.tpg.com.au/adslsymb/VK6AAL/Antennas/ant40.html 
bottom of page.

Tried running a SSTV repeater on 15m at 21.340 Mhz during my day 
light hours, approx 8am to 5pm WAST as an experiment, the results 
from this have astounded me in first few days has been accessed by 
ZL, JA, VK4, VK3 seems open to eastern states/JA all day long, and 
N5VP from US has been there twice in 2 days 01:44 UTC at 534 signals 
and worked him direct on 25w both times and VK6POP has worked him 
also on 50w.

Would be very interested in any reports, there is an opening to ZS2 
Hamcap propagation tool shows best window for 15m to ZS2 between 
07:30 UTC to 09:30 UTC optimum at 08:30 UTC this can be worked on 40m 
dipole with low power I look forward to seeing more activity over the 
next week on this band.

Hamcap propagation tool shows best window for 15m to ZL2 between 
03:00 UTC to 05:30 UTC.

Maybe ZS2 can work ZL2 on 15m via repeater or direct at different 
times.

Repeater access tone 1750 Hz it can be a bit finicky on 15m so try + -
100 hz if you dont get the CWID responding first time, I am on Echo 
Link some times to help.

As I am using one end of the 20m beams boom to support the reflector 
on 40m I will not be on 20m as the tower needs to be tilted over to 
facilitate this installation.

73 GD DX
VK6AAL

[digitalradio] Re: Vista another view

[Pete Flynn]

--- In digitalradio@yahoogroups.com, "Ross Biggar" <[EMAIL PROTECTED]> wrote:
>
> Hi all,
> Just to add another twist to the comments, I am now running all my 
ham programs digital and otherwise
> on Vista machines, using both Vista Ultimate and Vista business, all 
>with SP1. Which by the way went in perfectly.
BIG SNIP!

Howdy Ross;
Were all these programs XP "legacy" software that predated Vista? 
I'd suspect that there are quite a few aps that are so "vanilla" as 
far as their low level of system resources and OS elements that Vista 
isn't challenged.
I just bought a Vista laptop to run packet with the intent of whacking 
Vista and installing XP Pro, but am going to wait and see if the 
packet ap will run. I patched to SP1 and the computer ran noticeably 
quicker, so the update is a "must do".
73
Pete
K5BCG

[digitalradio] Re: RFI-Free PCs?

[Pete Flynn]

--- In digitalradio@yahoogroups.com, Tony <[EMAIL PROTECTED]> wrote:
SNIP! 
> I'm leaning towards something in the small-PC catagory with an LCD 
> monitor. Sound card and multiple USB ports are a must. Any  
> suggestions would be greatly appreciated.
> Tony -K2MO

Hi Tony;
I'd second the suggestion on assembling your own. I'd get a full 
metal cased mini-ATX. None of that foolishness with plastic windows 
in the sides of the case. There are numerous great deals; many 
choices on MBs and CPUs. If you're not looking for big CPU power 
even a socket AM2 Sempron-based system would be very affordable. 
Then you can always upgrade the CPU in the future if you wish. 
Everyone has on-board sound now, but you can jumper it "off" and 
install a discrete card if you wish. And USB ports are numerous too. 
Not to mention the option of putting in a PCI USB card for some 
extras.

good hunting
Pete
K5BCG

[digitalradio] Re: RFI-Free PCs?

[Pete]

--- In digitalradio@yahoogroups.com, Tony <[EMAIL PROTECTED]> wrote:
>
> All,
> 
> Need to replace the PC in the shack and would like to find something 
> that's RFI-free out of the box. I've had terrible luck with desktop 
> PC's, but the last two laptops (Toshiba) were very quiet.
> 
> I'm leaning towards something in the small-PC catagory with an LCD 
> monitor. Sound card and multiple USB ports are a must. Any suggestions 
> would be greatly appreciated.
> 
> Tony -K2MO
>
 I went through this and found 2 things that solved the problem I tied
the station earth to the metal case of the desktop and changed refresh
rate of the monitors, this where most of the birdies where coming from.

Now I can run dual screens with Cat5 extender on Mouse Keyboard +
screen to another room, had to wind the cat5 cable through 15 turns on
an old ferrite from TV tube to quieten it down.

Peter - VK6AAL

[digitalradio] SSTV VK - EU Tests on 7.033Mhz

[Pete]

I am new to this group and it appears to be where I might find
operators  with a similar interest, most of my activity is focused on
MMSSTV DX and  propagation tests. The last year I have focussed mainly
on 14.230 and LP to US and SP to EU.

This Winter in VK I am looking for operators in EU region interested
in SSTV on 7.033Mhz.

Equipment will be a TS430S and Emtron DX-2 amp with a 40m Inverted V
Horizontal polarisation is oriented to EU. I have run some tests with
PE2SWL webcam over last week and have managed some RX pics on a 20m
antenna at his location so the path is feasible.

Over next week I intend to add a wire Reflector behind the Inverted V
to lower the angle of radiation from 70 Degrees to 26 Degrees.

Also interested in EasyPal tests on 7.033Mhz but I am less familiar
with  this software on DX paths.

Any takers, The best opening to EU seems to be between 20-21 UTC I
will endeavour to be there most days my website will announce if my
station and webcam are operating

http://users.tpg.com.au/adslsymb/VK6AAL/

Look forward to any contacts, all the best and GD DX.

Re: [digitalradio] What's the roar?

[Pete]

Its Radio NZ  DRM operating from Taupo 59+++ here and wipe out fair 
chunk of band !! De Pete ZL2AUB
>
>
>
> Without even listening, I would have guessed it is a SWBC station
> operating under DRM.
>
> OK, I turned on the rig here and that is what it almost surely is. Very
> similar to ham DRM, except, of course, much wider.
>
> 73,
>
> Rick, KV9U
>
> Robert Chudek - K0RC wrote:
> > On 7147 KHz at about 14:00 UTC today there was a 10~12 KHz wide
> > digital signal that was booming in. It's still there 2 hours later but
> > only S-5 now. Can anyone tell me what this "noise" is about? It sounds
> > almost at bad as the old Russian jamming signals from years gone by.
> >
> > 73 de Bob - KØRC in MN
> >
> >
>
> 
> 
>
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 268.18.18/734 - Release Date: 26-03-07 
> 2:31 PM
>   

Re: [digitalradio] Newbie to DigitalRadio - Couple of Questions

[Pete]

Try Multipsk Kevin  it detects the mode for you   de Pete zl2aub
>
> Hi All,
>
> My name is Kevin, ZL1KFM.
> I am starting to get back into digital modes after a number of years
> away from it. Before was mainly on VHF packet.
> Back then I had a AEA PK-232 multimode modem. Back then I loved this
> unit for it's many features.
> One of the features I liked was the ability to have the PK-232 decide
> what the digital signal was, Packet, Amtor, Rtty etc.
>
> Today I am using MixW, and Ham Radio Deluxe, which are great software
> packages, and have just recently downloaded Hamscope (But haven't
> tried it yet). But none of these have the feature to allow it to
> search and decide the type of digital mode it is.
> Maybe it's the number of different digital modes now out there that
> make this feature unusable, but is there something out there, or
> could it be added?
>
> Why I ask this is listerning around, I hear what I believe to be a
> Rtty, PSK or the others (listerned to the tones from some of the web
> sites) and I can not for the life of me to get them to decode. I even
> change the modes as it goes to see if this helps, in most cases I am
> unable to see anything. My success rate s about 20-25%
>
> I am using a Kenwood TS-480S, and using the Data connection for RX
> and TX to the computer. I get a good pattern on the waterfall, and
> can see strong signals when there.
>
> Anyway I will keep trying to get it working, then I will try my hand
> at transmitting.
>
> Thanks for any help you can send my way. Will hopefully get it
> working 100% soon.
>
> Regards
>
> Kevin, ZL1KFM
>
> 
> 
>
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.441 / Virus Database: 268.17.31/676 - Release Date: 08-02-07 
> 3:04 PM
>   

[digitalradio] FCC Digital Reg Revision

[Pete Kemp]

FCC Corrects J2D Error in "Omnibus" Report and Order

NEWINGTON, CT, Nov 28, 2006 -- The FCC today 
released an 
Erratum 
that corrects one error in the recent<> Report 
and Order 
(R&O) 
in WT Docket 04-140 -- the so-called "omnibus" 
Amateur Radio proceeding -- that inadvertently 
limited J2D emissions to an occupied bandwidth of 
500 Hz. J2D emissions are data sent by modulating 
an SSB transmitter. Had it been left to stand, 
the error would have rendered illegal below 30 
MHz PACTOR III at full capability as well as 
Olivia and MT63 when operated at bandwidths 
greater than 500 Hz bandwidth, 1200 baud packet, Q15X25 and Clover 2000.

The FCC Erratum revises §97.3(c)(2) of the 
Amateur Service rules going into effect December 15 to read:

Data. Telemetry, telecommand and computer 
communications emissions having (i) designators 
with A, C, D, F, G, H, J or R as the first 
symbol, 1 as the second symbol, and D as the 
third symbol; (ii) emission J2D; and (iii) 
emissions A1C, F1C, F2C, J2C, and J3C having an 
occupied bandwidth of 500 Hz or less when 
transmitted on an amateur service frequency below 
30 MHz. Only a digital code of a type 
specifically authorized in this part may be transmitted.

In its comments on the proceeding, the ARRL 
argued that a 500-Hz bandwidth limitation in the 
definition of data emissions would have 
unintended consequences because the limitation 
would also apply to Amateur Radio bands where a 
higher bandwidth is allowed. In its R&O, the FCC 
said relaxing the bandwidth limitation "would de 
facto eliminate the separation of narrow 
bandwidth and wide bandwidth emissions," which it 
called an "reasonable means to minimize 
interference on shared frequencies and bands."

The Commission said in the running text of the 
R&O that it would address the League's concern by 
revising the Part 97 rules "to clarify that the 
500 Hz limitation applies only to the emission 
types we are adding to the definition of data 
when transmitted on Amateur Service frequencies below 30 MHz."

Unfortunately, the language of the intended 
revision that appeared in the original version of 
the R&O inadvertently included J2D emissions 
among those to which the 500-Hz bandwidth limitation would apply.

The FCC incorporated some unrelated editorial 
revisions in the version of the R&O that appeared 
November 15 in the 
Federal
 
Register. The "omnibus" rule changes -- including 
those accounted for in the Federal Register and 
the Erratum -- take effect Friday, December 15, at 12:01 AM EST (0501 UTC).

[digitalradio] SlowFeld

[Pete Kemp]

Talking all about airplanes last week led to 
airplane bounce software this week.
by Stan Horzepa, WA1LOU


G3PPT's VHF Communication via Aircraft 
Reflections 
Web 
page describes the aircraft propagation anomaly 
and includes software to experiment with this RF incongruity.

After reading last week's Surfin', 
About 
Airplanes, Mark Herson, N2MH, wrote to tell me 
about software that attempts to use the 
reflections from aircraft in order to make long 
distance contacts. Lionel Sear, G3PPT, wrote the 
software, which is called SlowFeldXPAS; you can 
read all about it at the VHF Communication via 
Aircraft Reflections 
Web page.

The Web page describes this propagation anomaly 
and includes a link to a revealing paper written 
by Ray Scrivens, G3LNM, explaining the mechanics 
of aircraft reflections. Lionel then explains how 
he determined the best mode of operation to use in his software.

According to Lionel, Hellschreiber is not 
sufficiently sensitive for our purpose, but he 
developed a very slow form of the mode for use 
where QRSS CW is used. The software that produced 
this mode was called SlowFeld, and at some three 
characters per minute, was very slow, but the 
sensitivity (readable at a level approaching 
âˆ'30dB below AWGN) was adequate for this application.

After further experimentation, it took only 
slight modifications of SlowFeld to produce 
SlowFeldXPAS, a version dedicated to aircraft 
scatter use, which you can download from this Web page.

Until next time, keep on surfin'.

(Via ARRL Web)

[digitalradio] New FCC Rules Dec 15th

[Pete Kemp]

FCC "Omnibus" Amateur Radio R&O Published in Federal Register, Takes 
Effect December 15

NEWINGTON, CT (November 15, 2006) -- Just a little over a month after 
the Federal Communications Commission released the Report and Order 
(R&O) in the so-called "Omnibus" Amateur Radio proceeding, WT Docket 
04-140 (FCC 06-149) to the public, a revised version appeared today 
in the Federal Register. The changes in the R&O will take effect 
Friday, December 15, at 12:01 AM EST, 30 days after its publication.

As expected, the Report & Order as published this morning clarified 
two items that had raised some concerns when it was first released 
last month: That the 80/75 meter band split applies to all three IARU 
Regions, and that FCC licensees in Region 2, which includes North 
America, can continue to use RTTY/data emissions in the 7.075-7.100 MHz band.

Still to be resolved are three controversial aspects of the Proceeding:

Expansion of the 75 meter phone band all the way down to 3600 kHz 
(thus reducing the privileges of General, Advanced and Amateur Extra 
class licensees, who had RTTY/data privileges in the 80 meter band, 
and CW privileges of General and Advanced class licensees)

The elimination of J2D emissions, data sent by modulating an SSB 
transmitter, of more than 500 Hz bandwidth (thus making PACTOR III at 
full capability illegal), and

The elimination of access to the automatic control RTTY/data subband 
at 3620-3635 kHz.

The ARRL Board is discussing the possibility of a petition to 
reconsider several items in the R&O.

ARRL Regulatory Information Specialist Dan Henderson, N1ND, 
commented: "The release of the R&O in the Federal Register has 
started the countdown clock. We are all looking forward to being able 
to use the refarmed frequencies starting on December 15. We are still 
anxiously awaiting the release of the Report and Order for 05-235, 
the Morse Code Proceeding. We are hopeful that the Commission will be 
able to move on that petition and address the outstanding issues in 
the Omnibus R&O soon."

(ARRL Web)

[digitalradio] PK-232 DCD problem

[Pete Jordahl K5GM]

Hey, guys,
I have a problem with a PK-232 that someone here has probably 
encountered.  This particular unit has the DSP mod, and worked fine 
until just recently.  Now the DCD light will not turn off, no matter 
what the setting of the Threshold control, which of course means that it 
will never transmit on packet.

I have a similar problem on an older unit which has only the MBX 
upgrade, so I don't think it is directly related to the DSP mod, but the 
two problems could be unrelated.

While I am at it, might mention that I have a DSP-2232 unit on which 
radio 1 works fine, but radio 2 will not key (pull down the PTT line).  
I suspect the TTL-RS-232 chips (MC1488-1489 or equivalent) but other 
suggestions are welcome.

Anyone have good words of advice?  What to check?  What obscure command 
to give?

Thanks and 73
Pete K5GM



The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/
 
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