[AMRadio] ht20


Greg Mijal bluebirdtele at embarqmail.com
Fri Feb 12 22:44:22 EST 2010


Could you check the modulator voltages and get back to us?
Tnx
Greg
WA7LYO
Kinsston NC
----- Original Message ----- 
From: "Larry Szendrei" <ne1s at securespeed.us>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Friday, February 12, 2010 11:45 AM
Subject: Re: [AMRadio] ht20


> Jack Schrader wrote:
>> I hope you remember me, Jack with the ht20.
>>
>> Got the ht20 hooked up and have god output in cw but not am. I hooked up 
>> a
>> 100w 210v test light to the antenna output on the ht20 but when I speak 
>> into
>> the mic on am the light gets dimmer not brighter. Any idea about that?
>>
>> Tnx    Jack
>>
>>
> Possibilities:
>
> 1) audio out-of-phase
> 2) insufficient drive to grid of final
> 3) final not properly loaded
> 4) insufficient capacitance in filter of HV supply to final/modulators
> 5) improper impedance match in mod tranny
>
> If after checking the obvious and it still occurs, just put it on the
> air. I have one rig that does this but still sounds quite acceptable.
> You can look deeper into it later, but have some fun with it in the mean
> time...
>
> Does the modulation envelope look OK on the scope?
>
> 73,
> -Larry/NE1S
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