Topband: FCP model

[Jim Brown]

On 7/31/2012 1:45 PM, Guy Olinger K2AV wrote:
> Well, an inductor and a choke are TWO devices instead of one.
>
> We've all heard of KISS.

Yes, BUT -- two cheap parts I can easily build instead of one expensive 
one that I have to buy.  An excellent  ( >5K ohms resistive) common mode 
choke to handle legal power can be built for about $5 (16 bifilar turns 
#12 THHN on a 2.4-in o.d. #31 core) and a suitable inductor wound with 
#10 THHN on a short length of 4-in PVC conduit will have a Q of at least 
250 at 2 MHz, and costs about $2. And I don't have to buy a commercial 
product.

I've wound and measured several such inductors using the standard 
equations (turns, diameter, winding length) in the ARRL Handbook and 
gotten inductance values within a few percent at 2 MHz, so you don't 
even need test equipment.

Please don't view my comments as criticism, Guy.  You've done some great 
work here that is allowing PFG operation on 160M from small lots.

Yes, some controlled tests would be great.  I'd be happy to help out if 
someone in  this area (N6RK?) wanted to set it up, and I'm certain that 
it wouldn't be difficult to recruit others if needed..

73, Jim K9YC