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I have noticed that some amps I have seen lately are class B, rather than AB. I am wondering why and what others have seen, when biasing class AB in a HG2879 box. Rumor has it, that when running AB in a HG2879 box, there is a high probability of self oscillation. I am wondering what truth there...

SDK 10R7S-05. C.F. 10.6935 MHz. Similar Cybernet export boards that have similar filter will work. Thanks, SL

https://www.worldwidedx.com/media/aug_8_2025_3_54_37_3-jpg.7421/ The end of an era. The antenna was installed, CQWW SSB 1998. We pushed it up at night, almost went flying. The mast is retracted in the photo. There is a 3 section 45 ft crank up (hand winch) guyed mast in the roof tower. My...

Anyone have one hanging around they would part with? Thanks! SL

This is the 3 band 02A PTBM125A4X Cybernet board, with a single device amp bolted to the rear. All I was able to locate, was minus the amp board, that I need to see. Thanks, SL

Seen many looking, not found. Anyone? Thanks, SL

Need spec from TRW RF Semi databook. PT4517 Motorola 48-869674 or M9674 Anyone? Thanks, SL

November 2024 The Radio Clinic of New York Review of Radioddity QT-60 Pro HF Transceiver The reviews that will follow in a series totaling three parts, are an overview, a portable operation and technical lab review. This is part one, with the subsequent parts to be published at a...

Radioddity appreciates the WWDX forum member brand loyalty. I have arranged a discount code, that can be used outside of other major sales events. I do test their radios, but receive no compensation from Radioddity. They are good people there, that stand behind what they sell, where others do...

Radioddity is releasing their radio. A test sample for evaluation and review, was shipped to me today. It is a re-badged AT-5555NII "Short Chassis" model. It has lineage from AT-6666 Pro's feature set. When you thought that the release of the Q6 Pro was exciting enough, here comes this one...

I thought I had seen it all, until now.... I have on the bench, a dirty, nasty, dusty, hairy, cigarette tar infested, screwdriver'd example of a 8719 Washington. What got me on this particular one, is that nearly EVERY tunable can is bad. I am close to getting it working, but geez. It should...

This is the first of this model I have here and am looking for others that have experienced problems with the exciter (radio PA). It came to me with shorted RT1 finals. I replaced them and kicked it out, as the owner did not want me to mess with all of the "upgrades" and add-ons he paid some...

Not sure of the version number, other than it is NOT a new model that covers 12m. This one requires PTT, MENU, MODE held with power on, to access service mode. Need the CH-02 test freq's and hopefully LO freqs, test points and BFO freq's. Customer radio is way off, particularly on USB...

I have a Sidewinder 46 here that is messed up badly. Need some service info. The Cobra 130 service info may help, as I believe that is what is inside the box, with a single tube PA. Thanks, SL

Anyone know where I can find the V2 diagrams? I searched online and came up empty. Also, the Stryker dealer portal has the wrong docs. All of the V2 docs are older gen board. Stryker does not have the V2 docs, but someone does. Thanks, SL

Anyone out there have a semi voltage chart for this radio? I have only found one for the bipolar version. Also, this radio has the RCI mixer, which seems to differ from the Siemens. I could use a datasheet on this as well. This all started when I got this radio and started to un-screwdriver it...

I just recently purchased this antenna, I built it per the supplied manual, the Maco V58 corrected manual and using all of the information I found on its construction out there on the web I can find. It just does not work for me as advertised. I tested the antenna at three heights above...