[Amps] THE SKINNY ON MY AL-82

[Jim Thomson]

Date: Fri, 19 Dec 2014 17:44:03 -0800
From: Bill Turner <dezrat at outlook.com>
To: Amps group <amps at contesting.com>
Subject: Re: [Amps] THE SKINNY ON MY AL-82

------------ ORIGINAL MESSAGE ------------(may be snipped)

On Fri, 19 Dec 2014 16:56:11 -0500, KM1H wrote:

>
>You get better suppression with the lower resistance since it further lowers 
>the Q and broadens the frequency response.

REPLY:

So Mr Measures with his low Q nichrome wire was right? 

73, Bill W6WRT

## Not quite. You use a low value resistor, not a low value nichrome coil.
Measures would use both a nichrome coil plus a resistor. 

##  All the rf flows through the coil...which will cook nichrome on 10m band.
The problem with conventional  carbon comp resistors is they drift way up in value
after a few years.  Even nib ones in the original packing will drift up in value. 
Then toss in the heat from the anode flowing down the lead..which will further cook
the CC resistor in a  conventional suppressor, and it will eventually drift up in value. 

##  measures assumed that the CC resistors  would go up in value cuz of parasitic vhf-uhf
events.   They went up in value, cuz they drifted up in value over several years.  Replace the
resistor..and all is well again. 

Jim  VE7RF