[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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