| Author |
Message |
    
The_bandit
Junior Member
Username: The_bandit
Post Number: 49
Registered: 8-2002
| | Posted on Thursday, August 16, 2007 - 9:41 pm: | 
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I have an Astatic Echo Max 2000 which I have had for many years. Recently I decided to wire it up to my Uniden Washington (5 pin) After wiring the microphone to the base, I got a bad squeal every time I keyed up. I finally got around to putting a switch inline with the 100 ohm resistor which the previous owner used to put talkback into the radio. After switching the talkback off (verified with another astatic microphone) I still get the squeal.
I again opened up the Uniden Washington and the Astatic Echomax and I've come up with this. The receive wire and the common switch are 0 ohms regardless of whether the microhpone is keyed or unkeyed on the momentary side of the ptt switch. The lock switch does its job without issue.
If I use the "Lock" position to key/unkey the radio I no longer have the audible squeal and the radio works fine. If I use the momentary ptt switch I still get a bad audible squeal.
My thinking is, since the rest of the circuit ties in between the two switches is that I have a bad momentary switch.
Anyone else ran into this problem? Also does anyone know of a supplier for a drop in replacement PTT switch before I go diving into my supplier catalogs.
thanks. |
Cbblackbeard
Intermediate Member
Username: Cbblackbeard
Post Number: 203
Registered: 12-2003
| | Posted on Monday, August 20, 2007 - 6:04 pm: |
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I tried to use the echo max on my Cobra 25 and got the squeel also, but when I used it with my General Lee... no problem at all. I talked to a local cb shop and they were no help. Now it's just sitting on the shelf in the box. |
Dale
Senior Member
Username: Dale
Post Number: 1095
Registered: 12-2002
| | Posted on Monday, August 20, 2007 - 8:00 pm: |
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think your probaly right about the switch
did ya try to turn down echo max mike?i had
one yrs ago this is a very p[owerful mike
i ran mine with the gain only at the first line
thats it.did ya know theres also a master gain
on the front of mike.mine i cranked that wide open the backed it off about 1/8 of a turn.then
on the mike adjusted it to the first line.
hope this helps
dale/a.k.a.hotrod
cef426
cvc#64
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