Got a DX - 2517 Mosfet version on my desk as a return. Radio is practically brand new. No swing mods whatsoever, no volt mods whatsoever, no hacks at all. It's stock, other than 11m added.
The owner had just bought it from another local operator. After about 2 weeks of running it, he decided to have it checked out and aligned back to spec to be on the safe side.
Well, all I did was:
Adjust 10.240 Crystal adjustment per service manual.
Adjust VCO voltage per service manual.
Adjust VCO Buffer per service manual.
Adjust PLL and Carrier oscillators per service manual.
Adjust RF Stage per service manual and spectrum analyzer.
All voltages are correct
All frequencies are spot on
After I carried it back to him, he used it over night and then notified me the receive was down. I told him I don't mess with the receiver adjustments at all because my signal generator is down due to an inverter board in the display, therefore I never touch receive.
I drove over and checked it out while it was still hooked to his antenna. He was right, the receive was acting weird. It's as though the radio was on a beam and picking certain local stations up strong, but others in the opposite direction were non existent on signal, barely could hear them.
Well, another friend of ours brought his 2517 that I went through over there to compare the receive on the same antenna, our friends receive didn't act like that, receive was great.
So, I touched up on receive with antenna hooked up and had several locals key up to give me a signal to align to, I only chose those locals running radios I went through because I know they're dead on frequency. Well, same result, those in one direction came up a lot, whereas those in other directions dropped or completely vanished.
We're all stumped on this. We've never experienced a radio that acts as a directional receiver using an omni directional antenna.
Anyone ever run across the same weird issue before? How did you resolve it?
This incident actually makes me look bad to newcomers. The old timers know it's not me, they trust my work.
I've got the radio back on my desk again now, trying to figure this strange issue out, but like I said earlier, we are all stumped on this.
The owner had just bought it from another local operator. After about 2 weeks of running it, he decided to have it checked out and aligned back to spec to be on the safe side.
Well, all I did was:
Adjust 10.240 Crystal adjustment per service manual.
Adjust VCO voltage per service manual.
Adjust VCO Buffer per service manual.
Adjust PLL and Carrier oscillators per service manual.
Adjust RF Stage per service manual and spectrum analyzer.
All voltages are correct
All frequencies are spot on
After I carried it back to him, he used it over night and then notified me the receive was down. I told him I don't mess with the receiver adjustments at all because my signal generator is down due to an inverter board in the display, therefore I never touch receive.
I drove over and checked it out while it was still hooked to his antenna. He was right, the receive was acting weird. It's as though the radio was on a beam and picking certain local stations up strong, but others in the opposite direction were non existent on signal, barely could hear them.
Well, another friend of ours brought his 2517 that I went through over there to compare the receive on the same antenna, our friends receive didn't act like that, receive was great.
So, I touched up on receive with antenna hooked up and had several locals key up to give me a signal to align to, I only chose those locals running radios I went through because I know they're dead on frequency. Well, same result, those in one direction came up a lot, whereas those in other directions dropped or completely vanished.
We're all stumped on this. We've never experienced a radio that acts as a directional receiver using an omni directional antenna.
Anyone ever run across the same weird issue before? How did you resolve it?
This incident actually makes me look bad to newcomers. The old timers know it's not me, they trust my work.
I've got the radio back on my desk again now, trying to figure this strange issue out, but like I said earlier, we are all stumped on this.