[Icom] pwr IC746

[Tony Hwang]

Hi,
Speaking of a power measuring, I once used Calorimeter(dummy load) to 
measure SHF high
power xmtrs. By converting water temp. rise in a given time, we could 
calculate actual power
output from the Klystron. Also sampling probe inside waveguide(SWR~1.0, 
pressurized N filled)
which will give actual power reading on a calibrated meter.
73,
Tony, VE6CGX
P.S. What a WX, today it is sunny and over 10C here, like spring.

Sheldon Daitch wrote:

>And as Clete would probably add, when measuring base currents for
>AM broadcast stations, with in-line ammeters,  it must be done without
>modulation, although Delta RF ammeter sampling coils seem to have
>a lot less response to modulation than the usual in-line meters.
>
>Also, a VU meter and a typical voltmeter will read the same on
>a steady state sine wave.  It is under dynamic audio that there
>will be differences between the readings, specifically as Clete
>points out, due to the ballistic characteristics of the VU meter.
>
>>From the audio monitoring standpoint, there are peak reading
>meters, and there could be as much as 20 dB difference between
>a VU meter and PPM on the same audio channel.  The
>typical spread is not usually that much, but I did observe
>an audio feed that had a high pulse noise that would
>drive the PPM much higher than the VU meter reading.
>The pulse was simply too short for the VU meter to respond
>with any degree of accuracy.
>
>73
>Sheldon
>WA4MZZ/SV7
>
>Cletus W Whitaker wrote:
>
>  
>
>>de WB2CPN South Central Pennsylvania   2002.11.17
>>
>>Adam,
>>I've worked where the antenna current at the base of the towers was measured
>>regularly.  Of course, the Impedance/Admittance there was established and verified
>>on a regular basis.  The other thought you may want to cover is the comparsion of
>>VU meters to DB and other meters, and the reason for the ballastic characteristics of
>>the VU meters.  I suppose ICOM's meters now don't have the fast attack and slow
>>release that we are accustomed to...          73   Clete
>>
>>----
>>Your Moderator: Dick Flanagan W6OLD, icom-owner@mailman.qth.net
>>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>>Icom FAQ: http://www.qsl.net/icom/
>>    
>>
>
>----
>Your Moderator: Dick Flanagan W6OLD, icom-owner@mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>  
>



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