Regarding the comment "at the rate he is going the RFX75 will be toast before a new meter arrives" I am "NOT" trying to increase the power output of the RFX75, I am simply trying to solve a "VOLTAGE DROP PROBLEM". however the total power output increased sigignificantly again. I then changed to a 30 amp regulated power supply (to get away from the battery safety problem) and now have the same voltage drop problem and to me that would indicate that the #12AWG power cord is too small.
When I was using a car battery and charger (heaven forbid) I had the same voltage drop problem and changing the power cord to the radio/RFX75 from a 16AWG to a 12AWG solved that problem and let's just say the total power output increased significantly. The original question was regarding a "Voltage drop problem" at the power source. I do not understand why a 75watt transistor would need a #10 wire. I will change the power cord to a#10AWG and cut the output back accordingly. So If I cchange the power cord to a #10AWG to stop the voltage problem, the output watts will surely go up. So here I am looking at the #12AWG power cord being too small. I put the original #16AWG power wire back on it and the DK and PEP watts dropped back to where they were in the beginning but the voltage at the power supply still drops to 5-6V and I would believe that says the power cord was too small.
#COBRA 29 LX RFX 150 INSTALL#
I can install resistors to lower the max output power but still do not get the Voltage dropping to 5 to 6V at the power supply? I could understand the voltage dropping that low and the watts decreasing but not increasing.
I'm just stating what it is doing and the only thing I have done is change the power cord and the output power keeps going up. I understand your point about the RFX75 putting out that much power and I agree. My original question was "why would there be a voltage drop of 6V at the battery" and what may happen with a constant 13.8V from a power supply but I suppose no one else runs radios and amps from a battery so my question will remain unanswered. I have a digital thermometer probe mounted inside the fins of the heatsink at the transistor location and on very lengthy QSO's the temperature has not gone over 115 *F. I read the instructions upon installing the RFX75 and keep the DK below 15 watts, I only mentioned the 30 watts to describe the variable power adjustment. I have had a few Older chargers put out a humm but that is easily fixed and the charger I use now has no humm. All connections are using srew terminals to eliminate the chance of stray sparks. The battery is in a metal box and ventilated to the outside. I have been running radios and amps from batteries and chargers since the early seventies but with precautions taken. Just for the purpose of not having a lengthy thread, I did not include other information regarding the operation and installation of my set-up.
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