Tag Archives: Hellschreiber

For Want of Nail, Nothing Like an Upgrade to Peak Interest, and Playing with Go-Kit Gear

In the run up to Dayton my Shack Computer had been acting up. Latency Spikes and gremlins that were giving PowerSDR no end of grief. Thought a decent dual-core Dell, I was even considering replacing the machine.

Troubleshooting found only erratic symptoms. The underlying cause(s) just weren’t easily found.

On return from Dayton middle son Winston KC9FVR/AG asked if we could run up the station so he could try some PSK31, having been reading the Digital HF book bought at the ARRL booth. We couldn’t get things to run very smoothly and after a very rapid shutdown in response to a sudden lightening storm powerful enough to set fire to buildings only 10 blocks away, the system would no longer recognize the Flex-5000A hardware.

Utilities and Testing showed that the OEM Dell Firewire card gave up the ghost.

Quick research at the Flex-Radio Knowledge Center & Forum Archives identified the best cards for performance and roughly $25 later a card was on its way rushing from Amazon.

Took the downtime to do ALL updates – from BIOS to any driver/software/system update that could be done. Also left the machine running a very in-depth anti-virus scan which ran overnight (all clean enough to pass).

The new card was truly PnP (Plug-n-Play) and despite having a different chipset than advertised (putting it into an OK-class rather than preferred-class for PowerSDR use) the system quickly reinstalled the “Found New Hardware” of the Flex-5000A.

Operator error led me to fight with VAC (Virtual Audio Cables) and settings – trouble I could have avoided by a simple reboot.

Once running it was lickety-split to help Winston KC9FVR/AG put a handful of PSK31 QSOs under his belt.

The drive that comes from a fresh license upgrade and an experimenter’s mindset had Winston KC9FVR/AG quickly asking – can I run fldigi from my Linux Thinkpad using some of your other gear?

So to the garage to raid the go-kit stash.

Up went the 20m Hamstick Dipole on 12 feet of surplus cameo-poles and a trial of a Small Wonder Labs PSK-20 I had ended up with somewhere along the way.

We had little joy with this setup, and it is uncertain if the PSK-20 is needing repairs or if we were struggling with Linux sound issues.

So out came the SGC-2020 Transceiver and the NUE-PSK Modem. This combination hadn’t really been used. The NUE-PSK modem had come back a few weeks ago from a full update at Midnight Solutions bringing it up to Version 5 with all the add-on features, and the transceiver had been run but once.

Plugged in the SGC-2020 and cabled up the NUE-PSK and “PING” we were on the air just that quick.

Winston KC9FVR/AG complete a QSO and then declared the micro-keyboard “worse than texting” and dug out an old full sized IBM clicky-clicky keyboard which worked wonderful.

Of course we weren’t about to read the manuals any further than the absolute basics to get things running, so we were hand-typing everything. Macros are for sissies (or for those who read the manuals).

Winston KC9FVR/AG downloaded a PSK31 app for his Android Phone and it was neat to see it decode from the speaker’s sound output.

I ran a handful of QSOs (it is sure a lot easier to type “K9ZW” than what it took him to type “KC9FVR/AG”) before we put the station away (took ten minutes to pick up everything and store it again.)

My go-kit HF gear did digital just fine! Power needs are such that I think I could get more than 12-18 hours of full duty out of each of the gell-cells I have set aside from their storage charge levels, and days if they were topped off first.

Remember that “spark of interest” that comes with a fresh license upgrade? Well it was back down to the shack to run a couple 20m & 160m JT65 demo contacts before promising each other that we would run some Hellschreiber on the weekend.

A couple things learned – in terms of the station the dead firewire card really put the main station out of commission. “For want of a Nail” they say the battle was lost, and for want of a working firewire port the station was off the air. Critical Key Component Dependency is not unique to an SDR setup, as most stations lack backups for mission critical items. Almost nobody has a spare for each item in their station.

Then the joy of seeing an inquisitive mind wanting to explore amateur radio shouldn’t be missing from an operator’s life. It was wonderful to help Winston KC9FVR/AG explore digital-HF and heartwarming that he would only let this father retire for the evening by making a promise for “more radios, more!” on the weekend!

And lastly that it is great fun to pull out the go-kit gear and give it a whirl. Couldn’t think of a finer father-son activity to put one’s work day aside.



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Hellschreiber – that Fuzzy Mode

K9ZW as received at KX5JT

K9ZW as received at KX5JT

Hellschreiber remains on my favorite mode list.

Simple, ticker-tape style, retro, steampunk… all are said to apply to the Hellschreiber mode.

The Flex-5000A does Hellschreiber well – https://k9zw.wordpress.com/2008/12/02/flex-5000a-does-hellschreiber/ – though this time I was using fldigi for the digital program.

Several years ago I put together a longer piece on exactly what Hellschreiber is: https://k9zw.wordpress.com/2008/08/04/repost-hellschreiber-about-the-mode/

Thank you to KX5JT  for sending me the screen shot  of his end of our QSO.

Hope to catch you on Hellschreiber!



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Digital Modes Club (DMC) and Feld Hell Club (FHC)

DMC Logo

DMC Logo

FHC Logo

FHC Logo

There are a number of on-line Radio “Clubs” that promote Digital Modes and two that I am member of are:

DMC Banner

Digital Modes Club

DMC #03379 K9ZW Certificate

and the

FHC Banner

Feld Hell Club (I am FH00169)

In each case they have awards, contests and add to the fun!

(I’ve written about PODS 070 where I am #432 before).



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Flex-5000A does Hellschreiber

Set up the Flex-Radio Flex-5000A and MixW Software to do “Feld Hell,” the most common variety of Hellschreiber.

If you are not familiar with Hellschreiber, I’ve done a post explaining this interesting mode.  You can find it at:

REPOST: Hellschreiber – The Modern/Historic Analog/Digital Mode


Flex-5000A doing Hellschreiber at the K9ZW shack

Flex-5000A doing Hellschreiber at the K9ZW shack

Again I have much more to configure, but the basic setup is sound!



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REPOST: Hellschreiber – The Modern/Historic Analog/Digital Mode

What modern Amateur Radio soundcard “Digital Mode” is nearly 80 years old?

What Amateur Radio soundcard “Digital Mode” is really analog?

What Amateur Radio soundcard mode was adopted by the WWII Axis Forces?

Dr Rudolph Hell’s “Hellschreiber” is that mode!

First we should make it clear that “Hell” was the good Dr’s surname, and that in Dr Hell’s German language it is a play on words of sort, translating as “Brightly.”

So it is NOT a cussword in this use, nor does it have any real meaning beyond Dr Hell’s name.

Hellschreiber sould be thought as related to the technology of a Fax machine. The message to be sent is “scanned” using a matrix or grid, much like making a halftone from a photograph for printing, and each spot in the grid is declared as either Black or White in an analog transmission.

Here is an example of Seven and Twelve High Grid formats for Feldhellschriber (Field Hell Writer):

7 and 12 wide Hellschreiber Layout

Dr Hell’s orginal prototype from the 1920’s seemed to have more to do with a Ticker Tape machine than anything else:

Hellschreiber Prototype

This original machine used Carbon Paper (kohlepapier) and a “striker” to tap the printout tape (called Registreirstreissen in the drawing):

7 and 12 wide Hellschreiber Layout
7 and 12 wide Hellschreiber Layout

The German Army gear was later refined for commercial use:

7 and 12 wide Hellschreiber Layout

Now we run Hellschreiber over Amateur Radio Bands using soundcard software:

Modern Soundcard Hellschreiber running on MixW

A good list of Hellschreiber References is:









http://feldhellclub.org/ is the premier Hellschreiber Club – K9ZW is FH #169 (there are over 650 members).


K9ZW (FH 169)

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