[R-390] URM-25 RF output measurement

[Veenstra, Lester]

The following is useful when URM-25x meets modern test equipment


dBm	 Watts      Volts RMS 	Volts P-P
		      50 Ohm 	50 Ohm 	
				
20	 0.10000	2.23607	6.325	
15	 0.03162	1.25743	3.557	
10	 0.01000	0.70711	2.000	
5	 0.00316	0.39764	1.125	
0	 0.00100	0.22361	0.632	
-10	 0.00010	0.07071	0.200	
-20	 0.00001	0.02236	0.063	
				
dBm	 Watts      Volts RMS 	Volts P-P	
		      50 Ohm 	50 Ohm 	MicroVolts
				
-7.0	 2.00E-04	0.1000000	0.283	      100,000
-13.0	 5.00E-05	0.0500000	0.141	       50,000
-21.0	 8.00E-06	0.0200000	0.057	       20,000
-27.0	 2.00E-06	0.0100000	0.028	       10,000
-33.0	 5.00E-07	0.0050000	0.014	        5,000
-41.0	 8.00E-08	0.0020000	0.006	        2,000
-47.0	 2.00E-08	0.0010000	0.003	        1,000
-67.0	 2.00E-10	0.0001000	0.000	          100
-87.0  2.00E-12	0.0000100	0.000	           10
-107.0 2.00E-14	0.0000010	0.000	            1
-127.0 2.00E-16	0.0000001	0.000	          0.1



Les (K1YCM/3) (CTM1)

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net] On Behalf Of Veenstra, Lester
Sent: Wednesday, July 07, 2004 7:36 AM
To: Michael Murphy; Bob Camp; Roy Morgan
Cc: r-390 at mailman.qth.net
Subject: RE: [R-390] URM-25 RF output measurement


Assuming the response is modest, I offer my service to measure URM-25(x)
at a number of significant freqs and levels (but please do not ask for
every MHz at every 5 dB).

So, since my days of actually working on 25's is lost in memory: what
would be an appropriate set of frequencies and levels that should be
verified, according to the real experts here on the "net"?

The selective level meter in its relative mode should make checking out
the attenuator for discontinuities a simple process.

I use a pair of HP-436 power meters with standard and high sensitivity
heads and an HP-3586 selective level meters.

Les Veenstra  (K1YCM/3) (CTM1)
Frederick MD
301-571-1212
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