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Excessively high ALC on SSB will produce IMD, which can't be seen in the envelope displayed on a scope. You need a good spectrum analyzer to see the distortion products. Or have a nearby ham with a

Hi Steve, Thanks to your instructions I tried to troubleshoot the swr problem. I monitored the IC960 and J2005-20 with some readings but nothing on the display. I also checked the ribbons with no

Hello everyone, 14 days ago i ran in the same problem. Took my radio to a A licensed friend of mine for doing some QSO in JT65 in 20m. RF power set at 30 watt, modulation level adjusted, swr was fine.

I'm ignoring the ALC... Mine go to high value but the The oscilloscope show fine sigs and no problem in transmission. 73

Generally speaking, mic gain controls ALC level on SSB, and carrier level controls it on carrier modes (cw/am/etc). If you lower power, ALC goes up on most rigs. Just reduce the drive, be it carrier

George - after reviewing your earlier post more carefully, your problem is not the same as the one I had. I did have lower power output on 80 and 160, but not as dramatic as you explained. But for

Thank you Steve for your "in depth" reply, I really appreciate!! Thankfully I have a sx-600 who monitors my tx. I also have the service manual so I'll have a look as per your instructions. Best

ok is the any way to adjust the ALC? and or how does it work? If I reduce the output power from 100W the ALC goes into the red?

You will need a Service Manual to do any troubleshooting. The SWR detector (D962) and bufffer amp (IC960) are easily accessed on the bottom of the PA board by just removing the bottom cover. They are

Hi, I resetted thi rig but nothing, no swr! All other meters are working fine. Who could tell me were to look on the board? Thank you for your time!!

If you have access to a signal generator, you can eliminate the driver and PA by testing RX sensitivity on each band, since the same filters and switching logic are used in RX as in TX mode. All of

Ivan, Thanks, this is exactly what I had thought. I had guessed that the 10 metre filter is always connected, and is dumping the RF from the other bands. I will have a nose over the weekend and report

John, that's not exactly the news I wanted, but I guess it's start... I wonder if that was replaced under warranty, or, did you pay? If you paid, any idea how much it cost you? Cheers. George, M1GEO.

I use a THP HL-550FX with an IC7000 on trips and it works great. The IC7000 will key the HL550 directly. I do not use the ALC connection as I received bad reports with it connected. The ALC feedback

George - I had almost an identical problem - low power output on the lower frequencies, plus distorted audio on the lower frequencies on SSB. I sent the radio to Icom and they replaced one of the

This is what I thought, regarding the power issue. I had terrible issues with the fuses on the power cable, when running from batteries - I was loosing 2 volts across the two fuses, but this was a

Considering the power output is directly related to frequency, I'd guess that you are correct in assessing a bad or disconnected capacitor, probably in the excitation/driver section somewhere. Poor

Sounds strange but if you?have the original fuses better try cleaning them..? They will cause voltage drop when u transmit.??? Click on this to find?Bob & Carolyn's??position:??

I should point out that I have done a full reset (power up plus band up and band down). The radio is powered by a 50 amp 13.8 volt power supply - I am aware that the rig is sensitive to voltage

Try a full reset