Low Medium vs Low High Frequency trannys
Submitted by CC106 on Thu, 2016-09-15 18:45
Interested to know more about frequencys that people are using.
might be upgrading transducer to a 1kW and would like to know thoughts about the low/med frequency transducers. Low 42-65 Med 85-135.
are there more limitations with these or are there more benefits fishing depths that range from shallow 20's through to deeper 400's ?
cheers
CC
Stevo81
Posts: 1278
Date Joined: 16/04/12
What sounder are you
What sounder are you running?
Low/Med or Low/High trannys are dual band chirp transducers that sweep the frequencies in that band, so low band sweeps 42-65 kHz and shows detail across that bandwith. Some sounders will also let you select a single frequency and run like a traditional sonar at say 200 kHz.
For deep 400's and shallow 20's work you would want L/H. Low for deep and high for the shallow stuff.
Thats my understanding of it anyway but i know theres couple of blokes on here that can explain it better and in more detail than me
•••••••• Electrical Contractor NOR ••••••••
CC106
Posts: 59
Date Joined: 07/01/14
Cheers Stevo, I've got a
Cheers Stevo, I've got a Garmin GPSMAP 1020xs.
was interested to know how well or how bad lower frequencys work in he shallower stuff, more like 40-60mtr. Send most of my time in 60+
Tim
Posts: 2497
Date Joined: 26/09/06
Low
the low or med should give you much better detail in shallow.
The low freq can be much more affected by interference and dirty water at speed though
High also tends to have a narrower beam so all depends what you are trying to do.
I have just swapped to a wide beam 200 and a narrower med freq transducers for what I do
CC106
Posts: 59
Date Joined: 07/01/14
Cheers Tim Im just tryin to
Cheers Tim
Im just tryin to find the best transducer in the 1kW price range that is going to let read at speed the bottom and when slowed down find bait fish balls or large fish without too much interference. I want accuracy with what it is reading. I bottom bash 95% of the time and in 40-60mtrs but do sneak out to 200+ on the good days
Bryce Day
Posts: 812
Date Joined: 01/06/15
id be more worried about
id be more worried about placement!
Stevo81
Posts: 1278
Date Joined: 16/04/12
what boat?
Thru hull with performance fairing.
B265LH
•••••••• Electrical Contractor NOR ••••••••
t bone
Posts: 351
Date Joined: 20/04/14
Tm275LH-w
I went with the transom mount 1KW chirp tranny and don't regret anything.
The TM275LH-w does the low (42-65kHz with a 16 - 25 degree cone) and the high (150-250kHz with 25 degree cone)
I run the high chirp in water anywhere up to 60m deep. If its 30 meters of less, ill also use the downscan image at same time.
Have found heaps of new spots to peak my interest whilst cruising around 24 knots, then mark it and come back over at a slower speed.
Marineboy
Posts: 845
Date Joined: 14/03/14
Transducer
gotta love the wide beam trannys ?
My spots are so secret even the fish don't know about them !