[Amps] construct ferrite "line isolator"

[Sam Carpenter]

Especially in the early days when studios were at or near the transmission
sites, I suspect the audio guys had to learn a lot of tricks. Can you
imagine when WLW was running over (on 700kHz) 500kw carrier and 100%
modulation what it would have been like trying to isolate audio? Can you
imagine even 600 ohm feeders coming from a remote location and trying to
isolate them. Fences, teeth, light bulbs and dresser handles would rectify
it and be audible in the area. I griped and complained about being bitten by
my lips touching a D104 on 80 running slightly less. I imagine they had a
lot of interesting things to deal with.

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Roger Parsons
Sent: Wednesday, October 27, 2010 11:41 AM
To: amps at contesting.com
Cc: gm3sek at ifwtech.co.uk
Subject: Re: [Amps] construct ferrite "line isolator"

I could not agree more with Ian, GM3SEK. 

Neil Muncy may well have 'discovered' the 'Pin 1 Problem' as related to pro
audio equipment in 1995. He did not discover the need for proper (single
point) grounding techniques, which have certainly been well known for many
decades and probably pre-date WW2.

It would probably do all of us a lot of good to understand that the sum of
human knowledge is just that, and that there are some rather clever people
working in just about every field. A sweeping dismissal of a whole class of
engineering expertise is neither correct nor helpful.

73 Roger
VE3ZI




On 10/26/2010 11:25 PM, Ian White GM3SEK wrote:
> PLEASE can we give this problem a new name!
>
> 'Pin 1' may mean something to pro audio people, but in amateur radio
> it's a bad name - meaningless, misleading and a barrier to
> communication.

One of the traditions in this world is that when you discover or invent 
something something you get to name it. Neil Muncy discovered the Pin 1 
Problem and published it, and that's what he chose to call it.  It would 
do RF folks a lot of good to realize that some pro audio folks really do 
know more about some things than they do, and in the world of RFI, 
there's been more progress made by pro audio folks than by RF folks. :)

73, Jim K9YC



      
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