[AMRadio] Low Power AM? |
rbethman
rbethman at comcast.net
Sun Nov 23 16:30:45 EST 2008
Actually, it reads 125ma for 75W input.
The recheck and set grid drive.
This is a WHOLLY different animal than a Plate Modulated AM rig for RTTY
use. That is what the Apache TX-1 is.
Screen modulation is a horse of a different color.
Not to mention that Novices did NOT have AM privileges.
Bob - N0DGN
Bob Macklin wrote:
> The Heath instructions for the DX-60 specifically state that for Novice
> operation to only increase the loading to 100ma for Novice operation (75W)
> or to 150ma for normal (full power) operation.
>
> Bob
> K5MYJ
> ----- Original Message -----
> From: "rbethman" <rbethman at comcast.net>
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Sent: Sunday, November 23, 2008 1:08 PM
> Subject: Re: [AMRadio] Low Power AM?
>
>
>
>> Bob,
>>
>> I'm NOT Pete. He may feel insulted. LOL
>>
>> You're using a PI network, NOT a link tuned system. If you reduce
>> loading, AND maintain plate dip, You will indeed reduse output AND go
>> NON-RESONANT.
>>
>> This opens a whole other can of worms.
>>
>> Bob - N0DGN
>>
>> Bob Macklin wrote:
>>
>>> No Pete,
>>>
>>> I am saying to reduce the load capacitor and maintain the dip on the
>>>
> plate
>
>>> capacitor.
>>>
>>> It's the same as reducing the coupling on a link coupled final.
>>>
>>> Bob
>>> K5MYJ
>>> ----- Original Message -----
>>> From: "rbethman" <rbethman at comcast.net>
>>> To: "Discussion of AM Radio in the Amateur Service"
>>> <amradio at mailman.qth.net>
>>> Sent: Sunday, November 23, 2008 12:48 PM
>>> Subject: Re: [AMRadio] Low Power AM?
>>>
>>>
>>>
>>>
>>>> Bob,
>>>>
>>>> While the plate transformer may well handle that, you are tuning off
>>>> resonance of the PI network. That results in tuning off the Plate dip.
>>>> I would NOT imagine that this concept would do the 6146s any good at
>>>>
> all.
>
>>>> I would suspect that a reduction of Drive would be wiser.
>>>>
>>>> Bob - NoDGN
>>>>
>>>> Bob Macklin wrote:
>>>>
>>>>
>>>>> Can't you just run at reduced input by reducing the loading? Then run
>>>>>
>>>>>
>>> the
>>>
>>>
>>>>> tube(s) at the CCS rating. The power transformer should take that.
>>>>>
>>>>> Bob
>>>>> K5MYJ
>>>>> ----- Original Message -----
>>>>> From: "rbethman" <rbethman at comcast.net>
>>>>> To: "Discussion of AM Radio in the Amateur Service"
>>>>> <amradio at mailman.qth.net>
>>>>> Sent: Sunday, November 23, 2008 12:14 PM
>>>>> Subject: Re: [AMRadio] Low Power AM?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> George,
>>>>>>
>>>>>> Good question! There is NO mention of RTTY operation ANYWHERE in the
>>>>>> Apache Manual.
>>>>>>
>>>>>> I'm also not sure how you can safely reduce the power out put
>>>>>>
> following
>
>>>>>> the tuning procedures, WITHOUT doing some damage to some components.
>>>>>>
>>>>>> It does just fine on AM and CW. Mixed results on SSB with the SB-10.
>>>>>>
>>>>>> Bob - N0DGN
>>>>>>
>>>>>>
>>>>>>
>>>> --
>>>> Bob - NØDGN
>>>>
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>> --
>> Bob - NØDGN
>>
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>
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--
Bob - NØDGN
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