[Hammarlund] S meter

[fkamp at comcast.net]

kirklandb at sympatico.ca wrote:
> I have a question on all of this:
>   Based on my experience with "older" receivers, the gain falls
>     off with higher operating frequency. The older the Rx the
>      faster the gain tends to fall off. e.g. comments on SX-28's 
>      indicate that it can be quite significant, it's even noticable
>      on R-388's.
> 
>    So, given that the gain of the Rx is not constant with operating
>    frequency how can the "S-meter" be relieved upon for x uV for S9?
>     e.g. consider reading on the 80m band versus 10m band?
> 
> Bill.
> 
>    
> 
>> From: "Bob Young" <youngbob53 at msn.com>
>> Date: 2006/07/13 Thu AM 11:03:34 EST
>> To: DJED1 at aol.com,  hammarlund at mailman.qth.net
>> Subject: Re: [Hammarlund] S meter
>>
>> I've been reading this with interest as I have several SP-200 and 400's and 
>> all their meters just go from 0-9 and their is no mention in the TM11-866 
>> manual about S meter units. I do have other manuals specifically about the 
>> SP-200's and 400's however (this manual I just mentioned is for their 
>> military receivers of which I have one which is really an SP-200XS,  BC-779 
>> I think). On the other hand my HQ-180 is (or was) calibrated at 50 uv. for 
>> S9.
>>
>> Bob Young
>> Millbury, Ma
>>
>>
>>> From: DJED1 at aol.com
>>> To: hammarlund at mailman.qth.net
>>> Subject: Re: [Hammarlund] S meter
>>> Date: Thu, 13 Jul 2006 09:57:47 EDT
>>>
>>> I recall that the old Hammarlund SP-200 I used as a kid had the same info  
>>> on
>>> S-meter calibration, i.e. a doubling of signal per unit and 50  microvolts
>>> for S-9.  I think that back in the '30 they only thought of  signal 
>>> strength in
>>> microvolts, so a doubling was twice the voltage.  And  probably they didn't
>>> see too many S-9+++ signals, considering that most rigs  were trnasmitting 
>>> 10 to
>>> 100 watts. I wasn't there, so just my .02
>>> Ed
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> 
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