[AMRadio] AM Bandwidth and Audio Quality (wasSourceBroadcastXmtrs)

Tue Jun 21 23:54:10 EDT 2011

Hi Rob,

Yes, this is exactly what I thought they would be.  I still think one could 
fairly easily make one.  The remote device is just a current sensor.  The 
remote unit would be an amplified meter which would be calibrated.  For $15 
you got a real bargain.  You could not make one for that price.

I have an RCA BTA-1R2 I am trying to restore.

Lee, w0vt
Houston, TX

-----Original Message----- 
From: Rob Atkinson
Sent: Tuesday, June 21, 2011 10:31 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] AM Bandwidth and Audio Quality 
(wasSourceBroadcastXmtrs)

Hi Lee, I've seen the toroid units go for $250 used.   For those who
don't understand, we're talking about a power measurement system for
medium wave broadcasting made by a company called Delta Electronics.
As I understand it, the idea is to place the measuring units out at
the tower antenna tuning units where the copper pipe to the tower from
the ATU can pass through the center of the toroid.  This is inside a
wx proof aluminum box that is sealed and has a N jack mounted on it.
the hole the rf carrying pipe to the tower goes though is about 2
inches diameter with a tough white plastic cover lining the hole and
toroid inside.  This generates a voltage at the N jack that can be
read via coax cable and you have one of these at each tower in a
directional antenna so you can see the power delivered to each load.

I got lucky and picked up three of the small toroid units for 1 KW
stations from a local AM on 1580 that went dark to allow another
property on 1590 to go to 5 KW.   I had no idea what they were at
first but they seemed to be something that might be useful so I got
them for $15, gave two away and kept one.   I do not have the fancy
meter unit however.

here's what one looks like:  http://www.mwpersons.com/delta.html

I was mistaken--they work up to 5 mhz but with less accuracy.

73

Rob
K5UJ

On Tue, Jun 21, 2011 at 8:39 PM, lee <pulsarxp at embarqmail.com> wrote:
> Bill,
>
> What do these Delta units retail for?
>
> I bet you could build a pretty nice one for ham use with little trouble.
> Just calibrate the meter with an accurate wattmeter into a 50 ohm dummy 
> load
> using ohms law.  Good enough for ham use.
>
> Lee, w0vt
>
> -----Original Message-----
> From: BILL GUYGER
> Sent: Tuesday, June 21, 2011 8:32 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] AM Bandwidth and Audio Quality (was
> SourceBroadcastXmtrs)
>
> Delta is REAL proud of their equipment so I doubt there are going to be 
> many
> spares laying around. I just replaced 4 20 Amp. max Toroid + meter combos 
> at
> KTCK with ones rated for 40 A. The old ones will be kept for spares for 
> KLIF
> or
> sent to other stations within the company that might need a replacement. 
> Not
> saying "it ain't gonna happen" just don't hold your breath.
>
>
> In addition, Delta generally only guarantees them up to 2 Mc.  They'll
> probably
> be fiarly accurate thru 80 M. but ????
>
> Bill AD5OL
>
>
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