I don't know this specific load, but the fact that the meter range switch
doesn't have any provision for "reflected" may well indicate that this unit
is not measuring power using a directional coupler, but rather as a
calorimeter, measuring thermal rise in the load. If that's the case, there
would be no way at all to make it an "in line" instrument, since the only
way it would indicate is by dissipating power in the load and measuring
heat.
I'd recommend dismantling the thing to see where the meter is getting its
current from...
WB2WIK/6
-----Original Message-----
From: Will Matney [mailto:craxd1@verizon.net]
Sent: Wednesday, August 17, 2005 10:36 AM
To: amps@contesting.com
Subject: [BULK] - [Amps] Sierra Electronics 5kW load/meter
All,
I just won a rackmount, 5kW termination load, with peak reading wattmeter
off ebay. The load was made by Sierra Electronics, division of Philco. The
model is a 400A-Z. I'm now looking for a manual on this and checked at Bama
with no luck. Do any have any info on this load/meter, or where one might
find it? A link to the item is below to see which one it is by the pics. I
also need to buy a new converter plug from a N connector to a UHF type
SO-239 female. The one I have here is in pretty poor shape and need a good
cheap place to buy one. Last, I wonder how hard it would be to convert this
to a thru line type so it can be switched between load and antenna? Thanks
all for any help.
http://cgi.ebay.com/Philco-400A-Z-Peak-Power-Wattmeter-Rack-Mount-5000-Watt_
W0QQitemZ7537709171QQcategoryZ1504QQcmdZViewItem
Best,
Will
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