[Amps] 3rd Order IMD

[R.Measures]

On Sep 22, 2005, at 11:34 AM, David C. Hallam wrote:

> As much as I believe Hallicrafters and Johnson are well designed 
> transmitters, I don't believe they use NFB in their finals. 

Correct, David.  Only Collins and Kenwood  used RF-NFB,   Hallicrafters 
6146 SSB transmitters were quite noticably feculent.

> The equipment at my QTH is exclusively boat anchor.

California is a terrible place to live.
>  
> David
> KC2JD
>> -----Original Message-----
>> From: Peter Chadwick [mailto:g3rzp at g3rzp.wanadoo.co.uk]
>> Sent: Thursday, September 22, 2005 2:04 PM
>> To: R.Measures; dhallam at rapidsys.com
>> Cc: Amps at Contesting. Com
>> Subject: Re: [Amps] 3rd Order IMD
>>
>>
>> Rich said:
>>
>>  
>>
>> >Because 6146 amps typically use RF-NFB, the total IMD is c. –38db 
>> from
>> >pep.
>>
>> Caveat: Well designed 6146 amps use NFB. Not all of them do.....
>>
>>  
>>
>> 73
>>
>>  
>>
>> Peter W6/G3RZP (San Diego this week).
>>
>>
>>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org