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[Amps] Monitor RF output on computer screen

To: <amps@contesting.com>
Subject: [Amps] Monitor RF output on computer screen
From: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 14 Mar 2020 11:36:12 -0700
List-post: <mailto:amps@contesting.com>
Date: Fri, 13 Mar 2020 14:15:24 -0700
From: Jim Brown <jim@audiosystemsgroup.com>
To: amps@contesting.com
Subject: Re: [Amps] Monitor RF output on computer screen

On 3/13/2020 1:38 PM, Jim wrote:
> That is debatable.

<Not if you study the data sheets and specs for both.

<The LP100A can read complex impedance at the point of measurement on the 
<line, so it could be used to find the input Z of a power amp (using a 
<Smith Chart to account for line length from the coupler to the amp). It 
<The unit is factory-calibrated to NIST, power accuracy is 5% worst case, 
<3% typical, at any signal level from 1W to rated power. It can read peak 
<hold, average, and instantaneous peaks. It can auto-switch between two 
<couplers on the outputs of my SO2R contesting station.

<73, Jim K9YC

## Does  the  LP-100  or  100A have  3  x  different  methods  to  shut  down 
an  amp ??

##  The  array  solutions  does! 
- TX  inhibit on  xcvr.
-  open  off  key  line....which  does  NOT  work  on  alpha  amps.
-  apply 0-9  negative  volts  to  ALC  on back  of  xcvr. 

##  In my   case, I  paralleled  2 x identical  displays  ....  to  ONE  
coupler,  with one  display  in shop  next  door,
and  2nd  display in  the  shack.  They both  indicate  identical  info.  With  
2 x displays   operating,  I  now have
2 x methods  to  shut  down an  amp. 

##   The  array solutions  displays  show  peaks  so  fast, they  also  easily 
show  ripple  on  the   B+  as well. 
Last  LED  will...dither. 

##  I  already  know  the  exact  input  Z  to    amps,  moot  point.   An 
MFJ-259B  on  input  to  amp,  plus  a 0-100  ohm  pot  at  cathode
will  work  well.  Pot  resistance =  input  Z.  Cathode  to grid  C  is  
...free  C2  on the  PI  tuned input.  

##  AS  has HF  couplers  for....  3 kw,  10 kw,  20  kw.   They  ALL  work  
extremely  well. 
Also, couplers  can  be  ordered  with  7-16 DIN  connectors.  

Jim   VE7RF

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