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Sencore CB-41 SWR/Wattmeter

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Dawn

Member
Joined
Apr 5, 2003
Messages
284
Location
Pinecrest,Fl
I picked up one of these meters from a Veteran's thrift shop for 35 bucks. Pretty beat up on the outside and lots of UV browning to the plastic buttons, but the sliding panel must have been used as the plastic is good and the scale unfaded. Like anything Sencore, the switches really needed some heavy duty cleaning before anything worked and was reliable. Completely disassembled and scrubbed, it doesn't look too bad. Inside was clean and in pretty nice condition.

Surprisingly, it tracked a Bird termaline pretty accurately just as is in average mode. I wound up doing the cal on it anyways after I bought a manual copy. This is one really nice meter and pretty gutsy inside for a wattmeter with a rather elaborate meter amp and peak detecting circuit, not the typical pair of time constant caps in peak mode. I can see why they fetch such high prices on E-bay in good condition and probably went for some big bucks new. The remote directional coupler makes this a joy to have on the bench rather then having to run cables to the meter. It even has a built in dummy load if you want to use it as a terminating watt meter. They apparently sold an extention cord for the coupler to work on vehicles. Nice touch if you had to work alone tuning an antenna.

I've never been much of a fan of anything Sencore made, but I'd certainly give this one a thumbs up. It's limited to only 20 watts, but that can easily be overcome with a power attenuator or modificaton for a 200W scale. These will suck two 9V batteries dry in no time, but you can use a wall wart with it for bench or station use. If you come by one of these, by all means buy it, but get a hypodermic needle and small bottle of Deoxit. You're going to need it.
 

JayMojave

Member
Joined
Dec 13, 2007
Messages
668
Location
Mojave Ca
Hello Dawn: Good info on the Sencore -41 Test Meter, got a diagram you can post?

I came across a Johnson Test Meter and it was a little beat up, but fully operational. I have it setting on one of my shelves on the radio designing, fixing, and playing bench. I have a radio tuned into the local CB Channel 38 LSB and connected to the Johnson Test Meter in Dummy Load Mode. This attenuates the input signal quit a bit allowing a S4 meter reading on the radio, allowing a good reference to what my signal sounds like, over a pair of head sets.

I have a few of the old General Radiotelephone Meters, Model 615 A, B, and C models. Comparing them to a new Bird 43 Wattmeter I noticed approx. 1 dB (17%) higher wattage reading than the Bird Model 43. These are also great meters to have and use,

I also used it for keeping an eye on my field strength when transmitting, kind of neat.

Jay in the Mojave
 
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