[MRCA] inverter whine from prc10 and bc611 battery adaptersand prc10 150 hz tone mod

[B. Smith]

      Usually you an add a  PL board without any major modifications.  
The usual complaint is that the board you added has a PL tone of 151.4 
and that is 1.4 cycles off of 150. But for close range work it usually 
works OK.
There were plenty of PL boards manufactured that has a tun-able PL and 
it was adjustable by a internal  10 turn pot.
Anyway take a look at my link below.  BTW Jeff that FSE38 that I gave 
you had PL installed.   :-)
Z

http://k4che.com/FSE/FSE%2038%20PL%20page1.htm

http://k4che.com/FSE/FSE%2038%20PL%20page1.htm
On 4/17/2017 11:34 PM, JEFF CICCONE wrote:
>
> folks
>
> i broke down and bought off epay inverter power supplies from the guy 
> in italy.
>
>
> the bc611 is 2 cylinders fastened together uses 1 d cell for filament 
> voltage and 3 d cells feeding the inverter part. it fits in nicely in 
> the battery compartment. there is a noticable whine in the transmit 
> audio. receive has a slight whine but nothing so bad that the receiver 
> cant hear
>
>
> the prc10 power supply uses a 6v sealed lead acid battery. also a 
> whine but not too bad and i can live with that
>
>
> anyone have ideas on filtering? i think its just picking it up thru 
> the b+ line. add a filter cap (what size) to ground?  or some kind of 
> choke is series w the b+?
>
>
> finally any ideas on adding 150hz tone to the transmit audio on the 
> prc10? i cant count on everyone doing the breck k4che ''old squelch'' 
> mod at the meets
>
>
>
> let me know. thanks
>
>
> jeff kg2bz
>
>
>
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