[AMRadio] AM Modulation Monitor

Brett Gazdzinski b.gaz at comcast.net
Mon Oct 28 17:49:30 EDT 2013

I have an RCA/Belair I got at a fest many years ago, its a BW50A.
Before that, I had an old General Radio.
I like the BW50a  as its solid state and is no tune on the input.

I have a small variable capacitor in the station control box that feed RF to 
it, so I can adjust the level for different bands and power levels.
The BW50 has a level pot, but I use the cap.

I added a relay so if I wear headphones, I get RX audio on RX, and my audio 
on TX.
That way I can tell if something goes wrong.


----- Original Message ----- 
From: "Randall Berry" <randyn3lrx at gmail.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Sunday, October 27, 2013 7:18 PM
Subject: Re: [AMRadio] AM Modulation Monitor

>  That's fine I am looking for an affordable (and working) Belar myself. So 
> I can relate to not having cheap CB junk in my shack. But unfortunately 
> that's all I have at the moment for monitoring modulation. Although I am 
> building a diode detector so I cam monitor by ear.
>  I saw the Gates one on eBay, that really looks in bad shape. The only 
> Belars I saw were FM.
> On 10/27/2013 07:49 AM, Rob Atkinson wrote:
>> I'm sure Bob wouldn't be caught dead with a CB SWR/Watt/Modulation
>> thing in his shack.  He probably has in mind something like these:
>> http://www.ebay.com/itm/Vintage-Gates-AM-Modulation-Monitor-Model-2639-Ham-Radio-Broadcasting-/141004649636
>> http://www.ebay.com/itm/RCA-BW-66E-Modulation-Monitor-Peak-Indicator-Tube-Broadcast-Vintage-Repair-/170964307948
>> http://www.ebay.com/itm/Vintage-RCA-BW66-E-Professional-Audio-Broadcast-Tube-Modulation-Monitor-/380706581993
>> or something made by Belar.  All should cover 160 and 75 m.
>> 73
>> Rob
>> K5UJ
>> On Sat, Oct 26, 2013 at 5:04 PM, Randall Berry <randyn3lrx at gmail.com> 
>> wrote:
>>> Hi Bob,
>>> Search eBay for CB Radio SWR/Watt/Modulation meters. Those things are 
>>> pretty
>>> broadband and should cover 3.5-30MHz easily. Just be sure you get one 
>>> that
>>> handles your output. I use a 1Kw rated Para Dynamics and it works fine.
>>> There are other brands at various prices/ratings available.
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