[time-nuts] GPS interference and history...

Thu Jun 9 20:54:25 UTC 2011

Hi

There are similar "protections" built into the TV station licensing process.
In the case of TV it's a whole raft of issues that all boil down to how good
the receiver needs to be. IMD, RF selectivity, IF selectivity, all figured
in. I suspect there were other things I've forgotten about. 

About every 10 years or so, the FCC used to sponsor a study done by one
company or the other of how much things could be improved. Each and every
study came to the conclusion that you could make a better TV and have more
channels on the air. As far as I know, nothing ever changed as a result.
They were interesting papers though. 

Frequency allocation and large scale receiver design have always gone hand
in hand. It's been that way at least since WWII and likely before that as
well. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Lester Veenstra
Sent: Thursday, June 09, 2011 3:32 PM
To: 'Discussion of precise time and frequency measurement'; ehydra at arcor.de
Subject: Re: [time-nuts] GPS interference and history...

Actually Chuck it was intermod in the front end creating 10.7 directly.

Lester B Veenstra  MØYCM K1YCM
lester at veenstras.com
m0ycm at veenstras.com
k1ycm at veenstras.com

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-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chuck Forsberg WA7KGX N2469R
Sent: Thursday, June 09, 2011 8:17 PM
To: ehydra at arcor.de; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS interference and history...

The image frequency for an FM receiver with a 10.7 mHz IF
is 21.4 mHz above or below.  Perhaps they were worried about
receivers with IFs in the 5 mHz range?

-- 
Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430

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