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Some of us call it internet. Am 28.03.25 um 02:04 schrieb Mark N2DMI via groups.io:

True that, but the ALC overshoot can happen from severe overdrive on the low bands. "Richard Knoppow via groups.io" <1oldlens1@...> wrote: -- 73 -Jim NU0C

Don't discount the possibility of RF feedback. Can happen with any mic if the grounding/shielding is not correct. If the mic has an internal amplifier it can be worse. RF feedback can be very

Interesting. That should not happen with normal audio but a strong enough spike can overshoot the ALC and cause the PS7 to shut off. I have seen this happen on 40m when I forget to turn the gain down

Not sure if this has anything to do with what you guys are discussing.? I use a Heil pro set (ps-6) boom mic headset with my SP75 . I've installed a Heil xt-1 microphone audio transformer in a switch

The audio when I was using the Heil Goldline would cause the PS7 to trip, so I thought it was possible overdriving the transmitter. Of course the Amp was online but without the TR7 the amp didn't

"I think there is also a related tip on this matter in the IN still available from our good old friend DL7MAJ (sk)." What is "IN"? Mark

Thanks Peter! I just purchased the set that Stan recommended and hopefully that will work. Mark

Thanks Stan I just bought it and it was the last pair. It says it comes Saturday. Perfect! Mark

Well, you mentioned the amplifier so that implied RFI. Otherwise the amplifier is irrelevant to the operation of the SP75. What exactly is happening to your audio? "K6OXN Bob via groups.io"

I have this set which I think I bought locally.? It has several different size tips. https://www.amazon.com/Channellock-927-Precision-Retaining-Interchangeable/dp/B000TG80SY?th=1 73 Stan KM4HQE

Mark: I have had my snap ring pliers set a long time, and it had a small diameter set that fits that snap ring. I may be home again this weekend and can measure mine. 73 Peter VE7PS

There is a "snap ring" that holds the hex nut in place located on the shaft of the PTO. The 2 holes (in the snap ring clip) seem smaller than the standard size. I purchased an entire snap ring set

I am not suspecting RFI.? I have already done the Heil mod for the ground, I am thinking I might need to do the ground of the SP75 direct to the TR7 and see if that helps.

In most of my dealings with TR-3's, I have found that the parts that are in common with the two (except the finals) are identical. From a manufacturing standpoint, it makes much sense: why spec

Are there any dimensional or other differences? Thanks for any experiential comments.

Just about any mic should work well with the SP75. Are you suspecting RFI from the amp? One thing you can try is, despite what the manual says, try adding a ground strap from the SP75 to the TR7

Desiccant, aka...silica gel? ?works superb.? It absorbs 40% of it's weight in water.? as noted it can be dried out in a 150m F oven.

My question is, is there a mod to the SP75 if you are using a Heil Mic on the TR7?? I am getting some problems with Audio and TX on my station that I installed an SP75 with a Heil Goldline mic.? The

Thanks Bill but I just ordered a complete set off of Amazon with overnight delivery. Mark