Don't know if anyone replied off list but one possibility is high SWR. Maybe it folds back the power and then the RF isn't great enough to get into the receiver and the popping stops.

Dont see why it would happen in CW, RTTY and DV but not FM, as I think all are full duty cycle modes. With AM or SSB the popping would only occur when you are speaking and the power output goes up.

I can tell you I have experienced popping sometimes when using my IC-910H. One thing I recently realized could have caused me trouble in the past was I was holding my Arrow over the top of the car. Make sure the antenna is as far away from your car/vehicle/radio as reasonably possible.

73, John Brier KG4AKV

On Sun, Nov 15, 2020, 00:43 Tony via AMSAT-BB [email protected] wrote:

All:

I have a new ICOM 9700 and I noticed what appears to be RF on the 2 meter band when transmitting on 70cm in satellite mode.

It appears as a short-lived popping sound and there's enough RF present to move the S-meter. It only happens when first keying the transmitter on CW, RTTY and DV. It does not appear on AM or FM.

Anyone else experience this?

Tony

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