[ICOM] Mic gain on the 706 MKIIG

[Bill Archer]

Hi Clif,

I would be interesting to see if you get the same results at 146 MHz.

Bill
KC5GNB


Clif Holland wrote:

> I checked the distortion on the FM transmitted signal.
>
> Test parameters:
> 28.6 Mhz (Icom sets it at 29.1 Mhz)
> Power out 6w
> Audio In; 1 Khz @ 30mv
> Test Equip: HP 8920A Service Monitor
>
> It was 6.3% no matter where the mike gain was set.
> The Deviation did not change with gain setting
> The sine wave wasn't pretty (6.3% distortion) but it did not change.
> Changing the input level from 5-30 mv did not change the distortion
> Changing the frquency to 1500 Hz gave a much better looking sine wave. 
> (Distortion not measureable as the meter is set for a 1 Khz tone)
>
> A note, when the mike gain was turned to "0" deviation was the same. 
> Keep turning it down and deviation went to zero. Audio off. The "0" 
> did not change but there is a lower setting. Turning back up the 
> deviation came up (still at "0" on display). Wierd.
>
> Clif Holland KA5IPF
> www.avvid.com
>
>
> ----- Original Message ----- From: "John Luthy" <jluthy at worldnet.att.net>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Wednesday, May 31, 2006 11:23 AM
> Subject: Re: [ICOM] Mic gain on the 706 MKIIG
>
>