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I have a Expert 1.3K-FA Amp and and a Flex 6400. What could be the problem with my audio distorting
I have the amp connected to a inverted V that was used with another amp with no problem.
1
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Answers
Hi Dennis,
There could be several causes. More details would help. What microphone? How is it connected to the radio? Are you using the internal EQ and how is it set? How high is your TX mic gain?
With the mic gain it is important to understand the meter. There is a peak indicator to the right of the level meter bar graph. When adjusting the level you want to ensure the level peak indicator does not exceed zero. If using the internal EQ then do not exceed between -10 and -5. See picture below for the peak indicator I am referring to.
When adjusting the TX EQ, start with all sliders at zero and make small adjustments. I find sliders set higher than +5 tend to start distorting, especially if mic gain is peaking close to zero.
Last, it may be RF getting into your mic or TX audio path. Try with someone who can receive you nice and strong. Set the amp to standby and try adjusting power down. If the problem goes away then it is RF getting in the TX audio.
73
Dave wo2x
Ok, with the amp straight into the dummy load and listening where? How are you monitoring your signal? Different radio or monitor on Flex?
If on a different receiver and only with the SPE amp then there it sounds like it may be a problem with the amp. Especially if an 811 amp does not exhibit the problem.
You might want to send an email describing the problem to SPE support. Maybe the amp bias circuit has an issue or bad LDMOS device? SPE support would be better to answer that question. But from what you describe it only happens when the SPE is in operate.
One last question, are you using a custom cable from the amp to Flex for band/frequency control?
Dave wo2x
Your not using ALC with the expert are you?
If you have an RCA male to male cable try connecting that from TX1 on Flex and connect to PTT in on amp. Disconnect Don Tassels cable then test again.
Test with amp on High power but lower drive from Flex (about 300 to 400 watts out) and see if distortion is still there. I have seen on rare occasions where a partial failure of the LDMOS device or bias circuit in amp can cause poor I.MD and distortion. Running the amp on high power will use a higher VDD voltage.
Since so far things point towards the amp being the suspect open a support ticket with SPE. They may have other tests you can do to pinpoint the problems.
Good luck!
Dave wo2x
Thanks again Dave for taking the time to help. All of your ideas for testing was spot on and helped a lot.
Dennis
KC6CQD
Glad to help!
73 & good DX
Dave wo2x