[600MRG] WSPR-15

[Claude Baker]

Jay, Rudy,

It turns out it doesn't work for me at the moment. I use a "modern" transceiver Icom IC-7200. All information moves between the computer and transceiver via a USB cable.

I found that the standard WSPR app, V2.11_r2263, exits when it attempts to transmit while WSPR-X, v0.8_r3058, is transmitting. Next attempt will involve installing an additional copy of WSPR-X with a different name and see what happens.

Jay - I considered your concerns and there may be some intermods but I expect very low level. As I conceive the system, I'm simply putting audio into the mike input of an SSB transmitter and I'm asking a 100 watt transmitter to put out 1 to 2 watts. The transmitter has a digital control for setting output power, but, from an external power/swr meter I find that the setting is not very accurate - varies by band. Again, using digital transmitter controls, I control the audio level to bring power output down to where I want it. 

Also, the way I conceived the two data streams going to the sound card, the audio signals are not mixed in the RF sense, they are simply summed before going to the modulator.

I found that with both WSPR and WSPR-X running, either would change the frequency of the transceiver but WSPR wouldn't cooperate on transmitting. I see a need to write some software coming up. 

I rarely exceed 10 watts output for anything because my only antenna is an 8'x13' loop on the wall about 8' behind me. I was just licensed early last year and my first transmissions of SSB caused several problems, punched through output capacitors in the entertainment system audio amp (they self-healed after a few days), killed part of the bathroom scale display, and had to reboot the garage door opener to get the car out of the garage. I'm strongly motivated toward QRSS for obvious reasons.

Why am I using an indoor antenna? - HOA.

More tales to follow.

Claude Baker, AC0ZL







On Monday, December 30, 2013 5:35 AM, "jrusgrove at comcast.net" <jrusgrove at comcast.net> wrote:
 
Claude

Transmitting two separate signals like that would require a close look at the IMD performance of the 
exciter and amplifier stages ... otherwise you will have unwanted products in the band. Reducing 
each tone by 6 dB would, for practical purposes, maintain the same PEP power as a single tone. If 
you're running at close to maximum output, your 3rd order IMD products will likely be down only ~ 30 
dB with higher order products down a bit further. Reducing power below -6 dB for each tone will 
improve the IMD. This of course assumes that you're running a linear amplifier and not Class D or E 
which aren't linear. Have done this here with a high power linear amplifier run at low power levels 
... works fine when the above limitations are accounted for.

Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2


----- Original Message ----- 
From: "Claude Baker" <ac0zl at yahoo.com>
To: <600mrg at w7ekb.com>
Sent: Monday, December 30, 2013 12:35 AM
Subject: [600MRG] WSPR-15


> As you've probably noticed, I leave a receiver parked on 630M decoding WSPR-2. After missing a few 
> hours of XSV tonight, I've decided to continue running WSPR-2 and WSPR-15 simultaneously as the 
> norm. If anyone else decides to run WSPR-15, I'll be listening!
>
> On the topic of running WSPR-2 and WSPR-15 simultaneously, has anyone considered transmitting both 
> signals simultaneously? Modern Windows and sound cards don't seem to have any problem putting out 
> (combining) multiple sound streams. WSPR is just a digital sound stream in the computer, it seems 
> simple in principle to transmit both signals unless you're using an Ultra 3.
>
> I think I'll try it on a higher band tomorrow and see what happens.
>
> Claude, AC0ZL
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