[Hammarlund] S meter

[kirklandb at sympatico.ca]

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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