I recently received this SA, but found the YTO is malfunction.
Searching the net I only found expensive replacement on ebay.
Also found that Luis, CT1DMK repaired those YTO by replacing the transistor.
Tried to reach Luis, but got no response sofar.
I have relation who can do the bonding for me if I can get such transistor.
Alternatively I came across an Avantek YO94-1201 YTO, which covers the required frequency range, but I cannot find any further connection information and details.
I hope that there is more information which can led me to repair the Spectrum Analyser.
Thanks in advance for any help.
Br. Jan PAoPLY
I'd like to hear from anyone on the list who's built the K1FO-22 70cm Yagi
antenna as shown in the ARRL Antenna Book. I followed the given dimensions
very carefully and the net result is that the antenna's VSWR plot, while
partly in the band, is also well outside the lower band edge. The
bandwidth seems very good for covering the entire band, however it extends
well below 432 MHz. The match can be manipulated by tuning and trimming and
I'm working on that. Some input from other's experience may be helpful.
As-built VSWR plot attached.
Robin Midgett K4IDC
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