Problems with Microphone. Need help!
Posted: Mon Mar 19, 2007 4:49 am
Hello!
I'm using some brand new Motorola GM380 mobile radios (UHF & VHF) for HAM-radio. TX and RX performance are great. I love them! But I have some trouble with my microphone modulation: The volume is OK but it seems that the microphone or the radios have some build in high-pass filters. So in some cases I get reports froms other stations, that they can hardly hear me because their speakers are not able give out my high-frequent modulation. How can I expand my dynamic range??? From Moto to Moto modulation is fine but some radios from yeasu and icom can not handle it.
There is no option for modulation in the CPS exept the mic gain but mic gain is set to an accurate level.
How can I kill that high pass filtering through the microphone?
I'm using a MDRMN40258 enhanced microphone. I also tested a GMN616A but this was even worse.
I haven't opened the microphone yet. Does anybody now about a build in high-pass filter and how to bypass it?
Thanks a lot for any hints!!!
I'm using some brand new Motorola GM380 mobile radios (UHF & VHF) for HAM-radio. TX and RX performance are great. I love them! But I have some trouble with my microphone modulation: The volume is OK but it seems that the microphone or the radios have some build in high-pass filters. So in some cases I get reports froms other stations, that they can hardly hear me because their speakers are not able give out my high-frequent modulation. How can I expand my dynamic range??? From Moto to Moto modulation is fine but some radios from yeasu and icom can not handle it.
There is no option for modulation in the CPS exept the mic gain but mic gain is set to an accurate level.
How can I kill that high pass filtering through the microphone?
I'm using a MDRMN40258 enhanced microphone. I also tested a GMN616A but this was even worse.
I haven't opened the microphone yet. Does anybody now about a build in high-pass filter and how to bypass it?
Thanks a lot for any hints!!!