B60 vs P79 Tansducers

[Smelly]

Hi Team!

Thumbs up required on performance difference between the Tilted Element flush mount in-hull B60 and Shoot-thru stick on P79:

P79 - Beam Width 11(170kHz) or 6 degrees(235kHz), FOM -19(170kHz) or -16(235kHz), Q35(170kHz) or Q16(200kHz)
Single Frequency

B60 - Beam Width 45(50kHz) or 12 degress(200kHz), FOM -31(50kHz) or -21(200kHz), Q28(50kHz) or Q31(200kHz)
Dual Frequency

These above specs were acquired from Airmar

Criteria:
Depth 60m max
Hold Bottom at high speed and in chop
Target Resolution
Bottom Definiton


My rig:
Haines Hunter 530
Outboard 110HP
Furuno 600L


Smelly

[Jonli]

I think P79 is not for Furuno 600L which I know , is a 50/200 kHz sounder , B60 is a surer choise , in my opinion .

JonLi .

[Smelly]

Yes, you are correct.

I am thinking the P79 from Airmar is rated at different frequencies (235kHz) so that it can be used as an additional ducer (to avoid resonant frequencies and noise interference) for very shallow depths (with very narrow beam width) - along with the normal rated frequencies for fish finding in deeper water at 200kHz...

Intersting...


PS. It is frustrating to realsie that Furuno have a P79 and Airmar have a P79 - both with entirely different specs!

[J-MAN]

.Smelly,
I'm not sure where on the Airmar website you got the info on the P79 transducer but see below for spec's from the Airmar 2006 product guide.
P79 Dual Frequency 50/200 Part No. 31-234-1-01 or with speed/temp. fly lead Part No. 31-449-1-01
Beam Angle 50kHz: 45 deg.
200kHz: 12 deg.
This transducer will perform very well for the requirements listed. It is an easy installation, whereas the B60 will require you to hole saw a 60mm hole in the hull in a position where it will not come into contact with the trailer rollers or skids.

By putting a little water in the bilge and putting the P79 transducer in a plastic bag with water in it you can move the transducer around unitil you find a spot inside the hull which provides good performance at the different speeds you require good performance at, mark the position then mount the P79 there. The B60 can also be mounted inside the hull but you will need to go through the same proceedure as above and then build a wetbox from sewer pipe or similar.

Condisering the performance between these transducers is almost identical and the P79 is so much easier to install the P79 would be my choice.

[Smelly]

J-Man,

Can you provide me with the link showing Airmar 2006 product guide?

here is the link for the P79 I am referring to..

http://www.airmartechnology.com/airm...uno&PageNo=157


Smelly

[Jonli]

Airmar Corp. is an OEM manufacturer for many brands , including Furuno , Raymarne , Garmin , etc. , etc. .

If your sounder is 50/200 version , transducers with different frequencies won't work with it . >

Bigger more modern sounders do have features that can adjust the frequencies to suit any transducers but not 600L .

On P ( Plastic ) 79 , Furuno may have it ordered from Airmar for 50/200 and
B ( Bronze ) 60 is a wide Beam version , being made from Bronze it is generally more expensive . If not mistaken , 235 kHz is used only by Garmin but not sure because I am familiar with Furuno n JRC only .

JonLi .

[Smelly]

Thanks for the clarification.

I actually want to hook the 235khz ducer to my Garmin 172 GPS..

And, want to hook the B60 (or maybe a P79 from Furuno) to my FF...

Thoughts?

Smelly

[J-MAN]

Smelly,
The P79 you were looking at is the "Smart Sensor" version which has an in-build processor which converts the raw sonar data into NMEA format data for specific equipment (typically multi-function radar/plotter/sounder units). Sorry for the longwinded explanation, I work in the marine electronics industry and it can be a bit hard to put things into breif laymans terms. Here is the link for the P79 to suit the 600L http://www.airmartechnology.com/airm...=All&PageNo=99

For your Garmin 172 you will also require a 200/50 kHz transducer (not 235kHz) and a GSD20 Black Box (sounder module).

[Smelly]

Thanks J-Man.

I guess the 235Khz is now out of the equation..

I am trying to find a solution to my ducer desires..

I will be installing Bennett Trim Tabs on my 5.3m Fibreglass boat.

I prefer not to use transom mounted ducers. I fish in depths up to 60m and use a 600L FF.

I want to measure and read :-
- thermoclines
- speed
- have clear bottom definition and target resolution
- depths less than 1.5 m

I have looked at :-
- B60 tilted flush mount ducer
- P79 dual frequency
- HIGH PRECISION TEMP SENSOR (Thru-hull at Transom) http://www.airmartechnology.com/airm...All&PageNo=159

What other options do I have to capture these measures - in this boat for this depth?


Smelly

[J-MAN]

Smelly,
If you are after thermocline detail on screen you will need a transducer in direct contact with the water, not shooting through the hull. Therefore your options are the B60, the Airmar temp. sensor you supplied the link for and as you want speed you will need a seperate speed sensor either thru-hull or transom mount (or SOG from your
GPS).
Although you mention you would prefer not to use transom mounted sensors, the other option is a transom mount triducer (dual frequency 200/50kHz, boat speed and water temp.) Airmar part #31-472-1-01
Housing #P66.