[AMRadio] BC1-J Mod trans. is fine.

[Dan Hall]

Whoa too!

Yes the mod transformer is just sitting there all of the above is true. I'm
not worried about the Mod oscillating right now. I got other fish to fry
first. I.E. one ugly sucker of a sine wave out of the tx. All things in good
time, then I will observe good practice and sort out all of this stuff one
at a time. I'm just happy the mod transformer is OK. Yesterday I thought it
was toast.

thanks for the help guys
Dan
----- Original Message -----
From: <KC4QLP at aol.com>
To: <amradio at mailman.qth.net>
Sent: Thursday, March 21, 2002 1:23 PM
Subject: Re: [AMRadio] BC1-J Mod trans. is fine.


> In a message dated 3/21/02 7:58:23 AM Eastern Standard Time,
> wwd at netheaven.com writes:
>
> << Whoa,
>
>  The tx should not know the difference between your dummy load OR your
>  antenna!! If it does then your antenna is not 50 ohms (or whatever). Best
>  work on the antenna side of things- feedline, tuner, antenna(!). Use a
>  small tx to get the antenna 100%; don't risk your big rig.
>
>  Does the tx have a 'tune mode'? If not pop a heating unit or lightbulbs
>  (wired in parallel) into HV primary to drop input voltage to ~1/2 normal.
>  This will drop tx output to ~1/4 and allow 'leisurely' tuning.
>
>  Good luck,
>  Bill    N2KQA
>
>  >> works fine into a dummy but the
>  >> modulator oscillates when into the antenna. I still need to clean up
the
>  >> transmitter side of things. But there's hope.
>  >>
>  >> Dan
>   >>
> also be sure the transmitter chassis is grounded...and that you have the
> chassis of your modulation transformer well grounded/connected to the
chassis
> of the transmitter.I've seen in commerical installs where some dummy had
left
> the transformer just sitting on the floor of the transmitter,not bolted
> down..and with every modulation peak there would be a small arc from the
> metal feet of the transformer to the grounded chassis of the transmitter.
> I'm surprised it didnt whipe out the mod transformer in that case.
>
> Bob Carter
>  Operations/Engineering
>
>  WGAI-NewsRadio 560 AM Stereo .., WCXL 104.1 Beach 104..., WQDK 99.3
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