[600MRG] DDS on 500MHz was XPQ WSPR2

Thu Oct 17 13:52:23 CDT 2013

Dick - yes even with my shaky hands and need lots of magnification eyesight I managed to do the fine pitch soldering on the display - the new ReV model Ultimate 3 will have bigger pitch and be back lit, again easing the eyestrain.

Im using the 500kHz LPF  plug in module kit today - sweeping the filter for 500K gives some 41dB second harmonic attenuation, that followed by a 7 section W1VD and a hi-Q loop means not of lot of stuff escapes apart from the 1st. I use 
http://www.picks.plus.com/software/LFtunemeter.pdf   to see whats going on and still useful down at 0.5W or so.

 I dont think the kit as is will goupto 50 as some people even had had to tweek the DDS a bit for operation on 28.

Im using the latest (as was) 2.04K chip which arrived yesterday - 2 mins to program up using two buttons in sequences and hey presto. In the end ill use it a X2 source for 137 and 500, square it up a bit, so it can be fed into a flip flop for the two FET PA , so will mod the filters accordingly

Yes its purely a standalone transmitter for the QRSS market so youd have to go back to the good old days of flicking a switch or interfacing the logic. Inputs are GPS/1pps (although it could run without this), 5V DC from a Walwart; Outputs are 50 ohm connector of your choice and thats it. No puter.

A (simple) Patch GPS module is also available for the 1PPS and Data required for auto Maidenhead location definition etc. I use a homebrewed version of the G3RUH 10MHz GPS solution for my data -   It appears to me to be the easiest way to get on Ive seen with these modes to date.

I wasnt fortunate to be selected for an XSH licencsee as I travelled too much during the original processes but got XPQ after WD2XDW (2003-6 Alaska and Oklahoma) after I was moved to AsiaPac for a few years.

Cheers
Laurence KL7 L We2XPQ etc

Date: Thu, 17 Oct 2013 10:27:54 -0700
Subject: Re: [600MRG] XPQ WSPR2
From: dick.bingham at gmail.com
To: hellozerohellozero at hotmail.com

Good morning Laurence

This Ultimate2 QRPLabs looks like a great 'kit' . Will this unit transmit on 50.293MHz too? Do you run it from a Windows-based computer or use a microprocessor like the Arduino (sp?) Since this is only a TX-kit, you have to coordinate a WSPR receiver too, so that ties-up - say - an IC-756PRO like the one I use at my station. Is the GPS--refd part of your system another 'kit' item ?

I am beginning to work with Glenn - N6GN - using 50.293MHz WSPR and would like to have a dedicated rig to 'free-up' my IC-756PRO for other things. At least it would run as a stand-alone beacon when the HF-rig is being used on another band.

I have also been looking for a simple way to fire-up my "XSH-26" license and this would at least get me on the air. I presently receive 600M using a 160-meter Half-Square antenna, 10MHz local-oscillator (HP10811D) and convert DC-to-500KHz to 10.000MHz-to-10.500MHz.

73
Dick/w7wkr CN98pi

On Thu, Oct 17, 2013 at 9:33 AM, Laurence KL7 L <hellozerohellozero at hotmail.com> wrote:

For my local and not so local chaps

At 1630Z Changed to WSPR2 Tx carrier appx 506.5kHz , 0.5W 100% - to receive WSPR2 use "dial" USB 505.00 kHz   Antennae is 1/4 Y loop

This continues to be a shake down of the Ultimate2 QRPLabs tx as the future driver for the main PA. Its GPS's refd and appears highly suited (and can be built in a an evening for not a lot of moolah) does WSPR2/15/QRSS/DFCW/CW/FSK/Helli and more.  Ive added the second PA transistor and added a few more turns on the output transformer and is basically flat (if using the correct plug in filters) from 137k to 21MHz (or more)

Ill also post this on lowfer and RSGB so apologies now for the dupes

Laurence KL7 L

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-- 
Dick Bingham - W7WKRStehekin, WA    CN98pi OR East Wenatchee, WA  CN97uj 