Distorted TX audio on 6600

Ray Gustafson WB0HHM

I have distorted TX  audio 
I have listened in three different Radios and the TX audio sounds raspy  , I even recorded 
my test on the Flex to play back so not to get confused by listening to my audio at the same
time I was talking into mic , tried different microphones too.
Sounds like when your are using class C on a AMP instead of AB1 
Anyone have the problem  

N2TU

Bill -VA3WTB

Art - N4QNT

Wondering if you have the Processor enabled? If so depending on the 8 band EQ levels at the 4, 6 and 8 K range, if those levels are above the plus 4 to 8 levels and the Processor is set at DX or DX plus the audio will be very distorted even if the Mic level is at 45 to 52..

Bill -VA3WTB

KC2QMA_John

Art - N4QNT

Hey John... and if I remember correctly even the Audio MON feature is PRE also..

Bill -VA3WTB

KC2QMA_John

Correct.

KC2QMA_John

N8SDR

Also check your microphone, if it does not require the bias voltage make sure it is OFF. Last night Art and I were helping a another op setup his 6K and a pr781- I know how they can sound once correctly setup, this one did not sound correct after making adjustments, turns out it had a slip on foam cover over the mic element, once it was removed it woke up and came to life- make sure when your adjusting nothing else is in front of mic until after you have it adjusted, then place your pop filter in place if needed.

Ray Gustafson WB0HHM

Thanks for all the information , I will try some of the suggestions

K0FLY

Ray Gustafson WB0HHM

Not yet , but been busy with antenna work I had a 6500 before the 6600 and I it always sounded so good I keep thinking that the PA or driver is not linear ? I going to measure current in transmit with no audio and post that maybe someone can compare it to there 6600 , to get a idea of idling current It won’t be true PA idling current, but may be worth checking.

K0FLY

Ray:

Yes it sounds as if you got some hardware problems  I have  my original 6500 as well as a 6600.  Using the same mic  and profile on both radios my friends tell me there is a slight difference in an on the air A to B comparison.   If I just put one on the air they can' tell me which radio I'm using.  I use the compression meter as my drive indicator

I run my EQ sliders into the plus range, however, I set the mic gain so that there there is a small indication on the compression meter(maybe 5 db on peaks) with the processor in the normal position.  The mic input meter peak bar is usually is around -10 to -15 .  If you had good reports with the 6500 the 6600 should perform as well with the same mic and EQ settings.

Gayle K0FLY

Ken - NM9P

When adjusting your TX EQ, always cut what you don’t need FIRST (usually bass sliders). Then add what is missing (often some highs). Do this with PROC OFF. Then add processing. Watch that you don’t slam the audio section with excessive bass, either with EQ of filter cutoff, or you can get distortion with the PROC even if your levels are below the red on the meter. Ken - NM9P

Ray Gustafson WB0HHM

I have had 6600 off for a couple days and got it going today and it sounds good so far I am leaving it on to see if it shows problem after on several hours I have been leaving it on for several days before this. Michael Aust send me information about Syncing Issue “Jitter in Internal 10 MHZ TCXO” which sounds like it could be the issue

Homer1952

Bill -VA3WTB

Homer1952

Bill -VA3WTB