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Hello All

I am really enjoying this kit and have had great results on WSPR and other modes. From Canada on 20 meters the U2 easily Wsprs around the world and the frequency calibration is very stable and accurate to a few hertz. A tremendous project by Hans.

Recently I have been confused by the differing results on Slow Hellschreiber with the new U2 when compared to my earlier U1 version.

I have tried different speeds , different shifts and different frequencies ( 30 and 40 meters) and it seems to me that the print received from my U1 is more legible than the print from my U2.

I would appreciate it if you could view the crop photos under VE3KCL and see if you have any ideas what settings or conditions could be causing difference in the definition of the print.

I built the U2 with 3 matched bs170s and am running 5 volts to the chip and 7 to 9 volts to the PA using a 7805 for regulation . Output is from .5 watts to about 1.5 watts depending on the band and PA voltage.
Idling current is 120 ma from the power supply and transmit goes to 270 to 350 ma depending on the band and antenna tuning.
Antenna is a G5RV and tuned by a matchbox to about 1.2:1

Any Ideas?

Dave Ve3kcl

On 06/06/2013 00:27, Dave wrote:

Recently I have been confused by the differing results on Slow Hellschreiber with the new U2 when compared to my earlier U1 version.

Hi Dave

I think you are the only person to have mentioned Hell Modes on the U2, and there have been no replies.

During initial tests I abandoned the Hell Modes early on as all results I was getting were indecipherable.
The frequency shifts (modulation) to produce Hell is critical. Being an FSK Mode it is suffering from the arithmetic software bug in v2.01, which is producing almost random shifts.
Additionally being a 'fast' mode the bandwidth due to the transients software bug in v2.01 is excessive.

Standby for the essential software release v2.0X.

73 Eddie G3ZJO

Hi Eddie

Thank you for your insight into the slow Hell.. math.
Trying to isolate the issue, I recently I mapped some Hell figures into the special messages mode and was pleasantly surprised to find that I could generate a letter V and letter E with pretty clear results on as little as 1 second timing. Each letter would require 25 numerical or letter inputs and then a few space inputs so it was a bit of a challenge for a dyslexic to do on graph paper and then transpose to inputs with U2 the editor.
The special messages mode would allow 20.... 1/2 hertz steps..... but in my case some of the numerical entries would not generate different steps eg. entering a 0, 1 or 2 sometimes generated the same frequency. In the middle of the 20 step band, the 1/2 hz steps worked correctly.
I assume the V2.0x may address this irregularity also.

Thanks for the reply
Dave Ve3kcl

On 08/06/2013 14:33, Dave wrote:

would not generate different steps eg. entering a 0, 1 or 2 sometimes generated the same frequency. In the middle of the 20 step band, the 1/2 hz steps worked correctly.

Yep, been there seen that.

I assume the V2.0x may address this irregularity also.

Yes indeed.

73 Eddie