If it hadn't been for those 21mhz (or 21mc) TV IFs back in the 60's, I
wouldn't have been able to get my Worked All Neighbors award!
Bill W6RGS
-----Original Message-----
From: RFI <rfi-bounces@contesting.com> On Behalf Of Roger D Johnson
Sent: Sunday, July 8, 2018 12:13
To: rfi@contesting.com
Subject: Re: [RFI] FCC Compliance and Enforcement
You're talking about two different problems. Many of the early TV sets had
an IF frequency near 21 MHz. This was fine until hams were allowed to use
the 15m band in 1952. The 15m ham signals got into the TV IF section due to
inadequate filtering and/or shielding. This was the fault of the TV design
and not the ham operators although it caused much grief and aggravation to
the hams.
snip73, Roger
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