[time-nuts] HP 3586B Selective Level Meter

[Robert Benward]

Chuck,
Got two of these guys, the "B" and the "C".  The C is the desirable one, 
50ohms, but you will pay about three times the price.  Use the adapter, it's 
$16 from the link below, it just isn't worth taking apart.  Also, you will 
need a 50ohm BNC feed thru termination, then set the front panel to 10Kohm 
input.  That will get you back to a 50 ohm input.  Then you need to add 
approx 1.76dB to correct the display for the change from 75ohms to 50ohms. 
You can use the display offset function.   Assuming this a fancy voltmeter, 
note that for 0dBm in a 75 ohm system you need 274mV at the terminals.  0dBm 
in a 50 ohm system can only provide 224mV, and thus will read -1.76dBm. 
Thus add 1.76dBm to correct the display.

      Impedance 50 75 75
      Voltage 0.224 0.224 0.274
      Watts 0.001 0.001 0.001
      dBm 0.000 -1.761 0.000




Good luck
Bob


http://www.milestek.com/s-147-trompeter-connectors.aspx


----- Original Message ----- 
From: "Chuck Forsberg WA7KGX N2469R" <caf at omen.com>
To: "time-nuts" <time-nuts at febo.com>
Sent: Thursday, July 19, 2012 2:22 AM
Subject: [time-nuts] HP 3586B Selective Level Meter


> Got one of these massive (by today's standards) beasts the other day.
> It has the option 003.  Quite the light show when it powers up.
>
> I have its external reference daisy chained with a radio and two other
> instruments sucking 10 MHz from my Thunderbolt.
>
> I have not decided what to do with the AT&T front panel input.
> Should I get a BNC adapter for it?  Or replace it with a BNC
> connector?
>
> -- 
> Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>   Omen Technology Inc      "The High Reliability Software"
> 10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430
>
>
>
>