Question about Radio Communications
You dont list the model but generally speaking no. The circuit is PLL and is difficult to change
Posted on Jun 10, 2013
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Posted on Jan 02, 2017
SOURCE: audio limiter
tintlady, here is the info you requested;
the AM limiter is R 276
These are the variable adjustments inside,and what they control.
VR-1 AM S-METER
VR-2 SSB S-METER
VR-3 SSB SQUELCH RANGE
VR-4 AM SQUELCH RANGE
VR-6 SSB CARRIER BALANCE
VR-7 TX OFFSET
VR-9 RF METER
VR-10 FINAL BIAS
VR-12 DRIVER BIAS
VR-13 SSB ALC
VR-14 AM HIGH POWER
VR-15 AM MODULATION METER
VR-16 AM MODULATION
VR-17 SSB POWER
VR-18 AM LOW POWER
VC1-10.240 MHz Frequency adjustment
Hope this helps you out, let me know,,Mechanic
Posted on Jan 27, 2008
Hi - You can download the manual from the link underlined in blue below:
75 WX ST
Other info here.
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Posted on Aug 31, 2008
SOURCE: Cobra 29 Ltd Classic
In most cases just turning up VR4 is more then enough. Replacing the final, tr14 with another transistor requires changing many more parts to get it to work.
With a new 29, there is no need to change the final. Just turn vr4 all the way up and you will see around 20 - 25 watts. L13 won't gain you a single watt. L12 will raise the dead key, and usually you want a lower dead key for good swing. L14 will gain you a few watts, but don't adjust this unless you have a watt meter. You turn it out to increase wattage, but too much will over bias the final and shorten its life.
You hook it to a watt meter with a dummy load. Then say a steady AHHHH into the mic while keyed. Turn the slug out until the needle stops going up, then back it down to where it stopped.
The easy thing to do, and you will be pleased is just to turn VR4 up. Now, Up is counter clockwise. Its a variable resistor, so the less resistance, the more modulation. So you want to turn the VR down.
that will be more then enough.
Posted on Apr 25, 2009
Open up the back of the radio and check the solder joint from the antenna connector. I had same problem and it was this.
Posted on May 17, 2009
Posted on Nov 09, 2011
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