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Boat Forum / Electronics / January 2007Furuno Sounder FCV-261
Hi Group, I have a FCV-261 1K Watt sounder I want to use with a 150 watt transducer. The FCV-261 has a four position power attenuator switch on the output going to the transducers. I can't find any info in the manual as to the power output for the four positions. I can measure the output of the amplifier, but a quick answer would save me the time to lug all my test equipment on board. :-) Can anyone shed any light on this? Thanks in advance, Capt J. Vincent Collins Master Oceans F/V Sun Dragon > Hi Group, > [quoted text clipped - 14 lines] > Master Oceans > F/V Sun Dragon Really depends on if the FCV-261 is Multi Freq or a Single Freq machine. I can't remeber for sure, but if it is a 50/200 then you will want a MultiFreq Transducer, similar to the OEM one that came with the Unit. If it is truely a Single Freq Unit, then I would only worry about the Power Switch position and that can be determined by going out to Deep Water (100 Fathoms) and lower the Receive gain to a just barely detectable bottom, then switch the power Switch back and forth while watching if the bottom disappears on each position. This will tell High from Low very easily...... Bruce in alaska  Signatureadd a <2> before @ > > Hi Group, > > [quoted text clipped - 27 lines] > > Bruce in alaska Bruce, weren't all FCV-261's dual frequency? I recall them being available in 28, 50, 88 or 200 khz combinations. This big daddy (for it's day) actually had two separate transmitter circuit boards it seems, and the output connectors were separate for two transducers. (two single frequency transducers, that it) rather than the single, dual frequency transmitter with a single dual frequency transducer, as many (most?) of the smaller, lower cost models. They had display switching to show either of the two frequency echoes or the echoes of both frequencies superimposed. (or maybe memory isn't too sharp). If I'm not completely looped, when the rig was switched to display a single frequency, the unused TX/RX board was not driven. Do you remember anything like that? I think some of our "black cod" longliners just used one big hooter of a 28 khz transducer in a tank with that 261. (sometimes the transducer was from an older Furuno paper machine that was eating up too much $35 a roll 8" paper) It was good to find out which power switch was the correct one for low power when using a small transducer with a Furuno 1kw machine, as they can easily damage the little plastic "100 watt" Radarsonics, Gemtronics, etc. Some of the little low power transducers with a rubber face would stand a little extra power if they were run in the water (not "tested" in air). Something about load matching?? Oh, gosh, the original poster's question! If it was me, I'd put a 100 watt (120 volt) lamp across the transducer connections for a load and run the rig briefly (real briefly) in a dead quiet location, and you can easily hear the transmitter thumping. Quickly run the switch through the four settings and you can easily tell the high and low power settings. And mark position clearly! Or, if the transducer is already installed, and that's the name of the game, just get to dead silence again and have someone stationed inside the boat right at the transducer, and listen. The 1kw pulse will be clearly audible (snap, snap, snap) Maybe don't make those last tests if you've been working over a hammering "Jimmy" most of the day. Old Chief Lynn > Bruce, weren't all FCV-261's dual frequency? I recall them being > available in 28, 50, 88 or 200 khz combinations. This big daddy (for it's [quoted text clipped - 32 lines] > > Old Chief Lynn The Old Gray Matter isn't pinging like it used to, and it has been a few years since I was actively dealing with these things, so that's why I am not sure what the spec's on the unit in question, are. I am mostly ReTired with an emphisis on TIRED, these days but the principals are the same, and the advice is sound, even if the rest of me isn't all that sound....... Bruce in alaska Signatureadd a <2> before @ |
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