Palomar SL41 microphone

Only makes popping sound when I unkey not when I key up and only does it on the Unidens, works fine on 29 chrome, guess I will take one of the radios with mic into a shop and see if noise can be duplicated and the source can be identified, thanks for feedback everyone.

 

Well the 68ltd and the 29ltd are the same. I don’t know about the 980 & 880 since the have a 6 pin jack. I haven’t been able to find any info on the mics pinout for those radios.

 

Your are probably right Rabbi, more annoying then actually a real problem, I say this because I tried SL 41 with 980 and popping noise did not happen however to eliminate feedback have to set mic gain on radio at 50%, I find it hard to believe that modulation is greater on 980 than 29 chrome that feedback would be more , oh well the mic pairs up well with the 29 chrome so I dont want to adjust anything inside the mic, will just use it with the the 29 chrome.

 

Okay very good, thanks. Well it’s definitely different from the usual uniden/cobra pin out. I figured one pin had to be for phantom power to feed the electret element, I just wasn’t sure which one. Interesting they have one pin not being used.

 

A couple of months ago I decided to modify my astatic D104m6b mic. I replaced the dynamic element with an electret. I was having issues with the popping sound at the end of my transmissions. I assumed it had to be something with the electrolytic capacitor in the resistor/capacitor circuit that feeds power to the mic element. Thanks to Ridgeline and Rabbi suggesting I replace the electrolytic cap with a .1 or 1 uf non-polarized capacitor. Well that solved my popping problem. I don’t know what they are using for a capacitor in the sl41 mic, but it’s just a thought.

 

I think I remember reading somewhere on the 6 pin mics, only 4 wires are used.

 

As I posted a while back the Magnum Omegaforce S45 stock mic works on the 980 so pin 6 must be hot probably similar to the President Grant II.