[AMRadio] ht20


Rob Atkinson ranchorobbo at gmail.com
Mon Feb 15 12:38:31 EST 2010


I know about all that shielding and the ten thousand screws but I
wonder in this day of digital tv etc. if it would be okay to run it in
the rack with the shielding off.  I heard that the reason for the fan
on the 4D32 is all those covers holding in heat.  With them off you
might be able to disconnect the fan.  OTOH, if running it open is a
safety hazard e.g. the rack has no sides and rear, that might be
different.   In my case, I don't have any pets or children.

73

Rob
K5UJ

On Mon, Feb 15, 2010 at 9:43 AM, Jack Schrader <w1jhs at myfairpoint.net> wrote:
> I got about 800v on both of the 807's.
>
> ----- Original Message -----
> From: "Greg Mijal" <bluebirdtele at embarqmail.com>
> To: <ne1s at securespeed.us>; "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Sent: Friday, February 12, 2010 10:44 PM
> Subject: Re: [AMRadio] ht20
>
>
>> 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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