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Discussion in 'CB and Export Equipment and Accessories' started by Roadhog, Jul 11, 2018 at 10:24 PM.
What can I expect running a stock 4 watt radio swinging 6 Watts into a ts 500v ? In a mobile setup
You'll probably have to push in the SSB button to get the carrier down to around 100 Watts or so.
The amplifier will tend to overemphasize the carrier power, and underemphasize the peak modulated power.
The strategy of turning down the radio's carrier, so that it shows a higher proportion of 'swing' or modulated power serves to restore the balance between voice peaks and carrier.
But if the radio is stuck at 4 Watts carrier, your only solution is to turn down the input of the amplifier, so the carrier remains between 100 and 120 Watts, more or less.
The front-panel variable control on the amplifier is prone to burn out. It's just not rated for the heat a full 4-Watt carrier puts onto it. Keep that control turned up to full. Use the two push buttons labeled "AM" and "SSB" to bring the carrier down to the sweet spot. This will be less prone to cause a breakdown. Usually the SSB button alone will bring a 4-Watt carrier drive down to a safe level.
So long as the front-panel variable-drive knob is turned all the way to the right, it won't burn out, as a rule.
The carrier power coming out of the amplifier is what you need to be watching. No more than 120 Watts, more or less will just sound better. A higher carrier power makes the amplifier run hot, and reduces the audio level they hear at the other end of the conversation.
Thanks for reply. How much will the 6 watt swing bring out of the amp? And the carrier is at 2.5 or 3 watt instead of 4. Checked it this morning.
Any wattmeter that's accurately calibrated should show the same as the next one on a dead carrier alone.
Where they will begin to disagree is when you modulate the radio. From the sound of it, your wattmeter reads only average power.
There is a good chance that a proper peak-reading wattmeter would show over 20 Watt peaks on this radio.
But you aren't using one of those. Odds are that with a 125 Watt carrier, the modulated swing on your meter might not be much more than that.
If the amplifier delivers 500 Watt peaks, an average-reading meter may not show more than 150 Watts, possibly less.
Peak-reading meters are not all created equal. Most of those will show at least 400 Watt modulated peaks with a Texas Star DX500.
Depending on the amplifier, and the radio, and the watttmeter, the peak modulated power may be four times the average reading.
Peak-reading wattmeters are not all created equal.
Oh, probably in the neighborhood of around 250 watts .....