[BC] NRSC - Harmonics above 5 MHz

[John Vodenik]

Now youse guys are getting into my RF land of fun and games.  FWIW...I will be moving from CA back th the District of Corruption at the end of the month.  Have been "promoted", I think was the word they used.  Guess I'll be playing with computers and such.  Gonna REALLY miss the RF side.  "RF has been very very good to me".

John, still at VOA / Delano for a while.

----- Original Message -----
From: "Burt I. Weiner" <biwa at earthlink.net>
Date: Friday, February 9, 2007 11:19 pm
Subject: [BC] NRSC - Harmonics above 5 MHz

> The problem with using a calibrated communications type of 
> receiver 
> or spectrum analyzer at 1 KM is the antenna.  You need to know the 
> antenna factor.  Antennas are not a flat device, especially when 
> your 
> looking over several octaves.  Each antenna will come with its own 
> unique calibration curve.  Basically, any sample device will be 
> something other than flat when you're talking about a spread over 
> several octaves.
> 
> an aside: One of the neatest and inexpensive receivers (on eBay) 
> is a 
> HP 3586B.  Typically $200 to $300.  This is a Selective Level 
> Voltmeter.  This is exactly what a Potomac FIM-41 is - a tuneable, 
> Selective Level Voltmeter.  The HP 3586B tunes from 10 Hz (Yes, 
> ten 
> Hertz) to 32 MHz and is a precision device.  The problem is -- you 
> still need a calibrated antenna to make field intensity 
> measurements.  Potomac came up with a really clever way to 
> standardize the loop and receiver together in the FIM series.
> 
> Burt
> 
> At 10:00 PM 2/9/2007, you wrote:
> 
> >However, a FIM-41 only goes to 5 MHz...  if you are doing a station
> >at the top end of the band you need a communications receiver or
> >analyzer to do a proper harmonic and spurious measurements above 
> 5 MHz...
> >
> >Robert
> 
> Burt I. Weiner Associates
> Broadcast Technical Services
> Glendale, California  U.S.A.
> biwa at earthlink.net
> K6OQK 
> 
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