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"Bruce in Alaska" wrote in message ... In article , Steve wrote: I don't know anything about the DS1 stuff but I replaced my similarly aged depth instrument (from space aged electronics!) last year and went though the same thoughts and questions you are going though. The problem is that transducer frequencies have changed over the years and are now standardising at least for this year on just two frequencies (50 and 200 KHz). It is very unlikely that your old system is either of these or will match what a modern instrument needs. If the frequencies of the old and new instruments are the same the transducer will probably work. It is possible that there could be a power rating problem which would cause you to destroy your old transducer but unless the ST40 has some serious power output I would imagine it probably is lower power than the old instrument and just more sensitive with better filters etc. Most people didn't seem to think that trying the wrong transducer with an instrument would cause damage but then again no one said it definitely wouldn't damage it either! In the end I just bought and fitted a new transducer which was hard work because the new transducer was too short to go though my the fairing block and hull so I had to make a new block and have a top hat nut made. Any to cap it all the transducer lead was 4" too short! However, the advantage of a new one it that you have a good chance that it will work. Good luck. bud wrote: I am replacing the very old electronics on my 1977 Hunter 30 sailboat. I want to use the Raymarine ST40 bidata instrument, but I wonder if I can use the existing transducers for deptch and speed. The old depth is a Standard DS1. Any thoughts on this? If not reasonable, do I just install the new through hull transducers and leave the old ones in? or remove the old ones and try to fit the new ones in the same holes? thanks, Buddy E Actually Depthmeter Frequencies have not changed much in the last 50 years. The standard Freq's are 200Khz, 100Khz 88Khz, 50Khz, and 28Khz. Transducer types haven't changed much either. Barium Titonate Crystals and Magnetic Restriction type. 99% of the consumer transducers are Crystal type at either 200Khz or 50Khz, or some of the last 10 years types are dual 200/50Khz systems. Commercial sounders that are designed for VERY DEEP waters use 28Khz and most modern use Crystals. During WWII they used Magnetic Restriction Transducers at 28 Khz for the old SubSig sounders. 88Khz was used for a while by the Norwegens, for their Trawl Sounders but have mostly switch to the 200Khz/50Khz in the last 10 years. Ross Labratories in Seattle Washington, USA had a very suscessfull line of sounders that ran at 100Khz, and have been around for 50 years, or so. I still see them aboard vessles around the North Pacific. Chances are that if it is a cheap consumer model, it is 200Khz and will handle up to 50 Watts PeakPower. If it was designed for depths lower than 100 Fathoms it will be a 50Khz and handle 100 Watts PeakPower. Commercial Type Transducers come in many Power sizes, but mostly the Frequencies will ususally be 50Khz, unless it is for shallow depths (less than 300 Ft) then 200 Khz. Bruce in alaska -- add a 2 before @ Other common frequencies include 120 KHz and 190 KHz. Doug K7ABX |
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