开云体育

Hi,

JoshuaClough4 starts his post with his SDR. I have been playing with SDR a little and with "legacy" radios for a long time. That SDR can be and probably is being pushed *hard* by rf being generated right next to it - in the same room, in the same house, on the same estate. Not in the next state. There are so many ways with that kind of proximity to overload the receiver.

Inside the transmitter the carrier and the opposite sideband are fully present. The signal is processed to remove the carrier and the opposite sideband and then send it to the antenna. But due to varying amounts of leakage they are always present on the same estate, in the same house, and even down to a couple of inches away from the transmitter. A new ham who would just casually tweak those pots while watching the SDR may be one of the new hams who denies that a shielded box is needed for the receiver AND for the transmitter.

Just as a suggestion..reset those pots following the directions for the radio. And then leave them alone until *after* you have installed replacement transistors. Then lookup a WebSDR station within range of your transmitter but still hundreds of miles away (well beyond your local leakage). Examine your signal as seen from afar without having to enlist some other ham to look at it from afar on one of those dreadful "legacy" ham stations :) Back in antiquity we relied on distant friends to examine our signals from those distances. Now we can do it ourselves via WebSDR so the receiver is beyond the "local leakage".

I mentioned newbie mistakes and misunderstandings. Somebody is going to be offended. There are hundreds of us here. A few have thin skins. It's really hard trying to 'elmer' new hams via email and mail lists even if everybody uses the same language. We don't. I'm trying to help and nothing is off limits. Real questions here or in private are welcome. Flames will get you membership in my bit bucket.

73,

Bill KU8H

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bark less - wag more