1 GHzFrequency limit

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swetterlin
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Joined: Sat Apr 28, 2018 3:29 pm

1 GHzFrequency limit

Post by swetterlin » Fri Jan 22, 2010 2:05 pm

The nominal top frequency of the MSA in the 1G band is 1 GHz (hence the moniker "1G"). But the real limit is determined by the high voltage supply for VCO tuning. I have been using a 23V supply (schematic and PCB are on my website) rather than the 18-19V supply on the control board. This can get PLO1 into the area of 2200 MHz, which (with a 1013 MHz IF1) gives a max tuning frequency near 1200 MHz. There are some potential distortions if you have input frequencies in the area of the cavity filter frequency, but this has been working well for me.



Of course, you can reach high frequencies with the 2G and 3G bands, but this is a convenient way to extend 1G, especially if you have a special interest in, say, avionics equipment.



Sam W.

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