Re: QUANTAR VHF Audio Interface...
|
Almost ALL of the new Yaesu handhelds have a mic gain adjustment. ? Even my 20 year old VX-6R has a 1-10 mic gain adjustment.?? And it does work.
Andy
Ya, I have an 8500 and a 8100 and any mic gain must be done by modifying the mic itself.? I remember trying everything
to try to change the PotatoHead hollow mic audio or how to hold it just right.? I finally wound up using the optional mic to
actually talk on it.
The Wid/Nar changes the dev.? Another menu item changes channel spacing for programming.
The RCVR only has one bandwidth.
There are internal adjustments for VCO tuning and an alignment routine for things like REF OSC and Deviation for each band.
Service manual is fat with color board patterns and schematics.
A lot of newer radios have some kind adjustment for gain.? Get the Service manuals if you want to know whats inside.
The User manuals are usually front panel operational.
On Mon, Nov 7, 2022 at 03:34 AM, Chuck Kelsey wrote:
Well, I guess Yaesu's manuals need to be corrected/clarified then.
Menu #43 [WID.NAR] says:
Function: Reducing the MIC Gain (and Deviation).
I totally understand what you are saying, but best I can tell, setting this menu item to narrow does nothing to change the bandwidth of the radio's receiver, so it is not true narrow band. I only see a single IF filter in the schematic, unlike commercial radios where I've seen two.
I can guarantee if a user sets this function to narrow, in a wide-band system, their audio will be very low. I've seen this mistake happen before. Just sayin....
Chuck
On 11/6/2022 11:16 PM, Jim Barbour wrote:
On 11/6/2022 2:08 PM, Chuck Kelsey wrote:
All I can say is check the menu options on the radio. Both the Yaesu FT8800 and FT-8900 list wide/narrow as a mic/deviation setting. It is global for each band. Best I can tell it does nothing to the RX, so not truly wideband/narrowband.
That's not mic gain. Completely different.
|
