The SDR-1000

Posted on Feb 6, 2014

Emphasis on the high bands (902 thru 10 GHz) had been a priority here at ARS KMGT for the last few years. The low bands were in pretty good shape, so not much other than standard maintenance was needed there. However, improvements to the microwave station for the high bands have been a main focus with lots of options considered along the way. Initial operations using a FT-100D as my 144 MHz IF

Click here to download the full size of the above Circuit.

for the high bands worked just fine, however it became apparent unless everyone (including myself) was on a phase locked frequency reference, then finding signals were always a bit of a struggle. In order to maximize microwave QSOs during the various contests, a visual representation of the band would be ideal in helping eliminating one of the variables of making a microwave QSO. The Icom 756 series of radios with the "bandscope" seemed to be the ideal candidate for driving the microwave equipment. In 2002, I started using an Icom 756 Pro II as my IF radio at 28 MHz. I used that to drive a SSB Electronics LT2S 144 MHz transverter. That in turn was used to drive the microwave transverters. It was immediately evident that the bandscope was useful, but not all that sensitive. Fairly good signals on the microwave bands needed to be present in order to make good use of the bandscope. However, this setup came to be very handy and fairly enjoyable for microwave use. Aside from the bandscope sensitivity and other operating quirks of the 756 Pro II, it was the best I could do at that point. See the Original write-up on the Icom 756 Pro II interfacing for details on this setup. I met Ken - K5UHF from his roving expedition up here during the June VHF 2001 Contest. Ken and I had a good time working each other as he roved from North Dakota on his way back to Texas. Later on, we met up at the CSVHFS Convention in Dallas that July. At...

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