Preset frequency and additional questions

[mattology]

i have found some inconsistencies and also have some questions regarding the fish finder updates to the tzt3.

first off there is an error on page2 stating that the TZT9F is not able to use preset frequencies. My TZT9F when selected has no issues using three preset frequencies like in the menu, as long as they are single channel. for example I can use the preset frequencies to choose three discrete frequencies of 194, 200, and 208 on my B164. i can also choose a single channel chirp with it for example 200 center wavelength with a bandwidth of 12 if i wanted. (due to the high Q in the b164, wider bandwidth is not capable.)

I will attach some photos. I will make some more replies with additional questions

 

[mattology]

TZT9F selected as FishFinder Source - Preset Frequencies were able to be selected.

To do this, I chose my transducer type as B175H , one of the single channel chirp transducers compatible with the TZT9F.

TZT9F selected as Fish Finder Source - > Preset Frequency Setup enabled

B175H single channel chirp transducer selected

Preset Frequency Enabled Custom FM ( Manual Chirp) HF only single channel

With Center Frequency 199kHz, only the center frequency is displayed on the FF corner screen

Is it effectively chirping or is it still only hitting the center frequency? Is there a way for the display to show the bandwidth in a later update?

 

[Johnny Electron]

Can you provide a link to the document you said that page 2 says that the TZT9 is not able to use preset freqs? I have been unable to find it and maybe we need to report a needed change to the manual. Maybe you have an older manual before v2 software came out?

Am I understanding you that you are trying to run your 50/200 B164 in CHIRP? IF so, I recommend you not do that. Chirp needs special elements designed to dissipate the extra heat created. When sweeping outside the rating of the transducer the power is also reflected to your sounder. (VSWR) If running a non-chirp into chirp mode is likely to damage the transducer, sounder or both. It would be much like putting diesel gas into an unleaded car. I don't recommend on coloring outside the lines of the proper settings for the connected transducer. To sweep chirp you must have a rated chirp transducer connected.

When you do have a non-chirp transducer setup and connected, you don't have the presets because you shouldn't have them. The sounder is working on a fixed freq and not sweeping.

 

[mattology]

sorry for the delay,

i was out fishing, hahaha

https://furunousa.com/-/media/sites/fur ... ements.pdf Page 2 at the bottom.


I was only running the B164 in chirp for a few moments to show that it is possible to select within the TZT9F options menu and fishfinder source. It's only a 50/200 transducer and not designed for chirp.


The TM260 I have connected to the TZT12F however, although it is traditionally considered a 50/200 transducer, it is specifically called out by airmar as broadband transducer, although it is not as capable as the 265. I have done a little bit of chirp experimentation with it on the high end, but I prefer running it in the 50/200 mode because the bottom discrimination to me is more useful. I wouldn't say I have more than a few minutes of chirp time on either transducer, the majority is all 50/200, and it's putting me on the fish as-is.

 

[Johnny Electron]

Broadband doesn't mean CHIRP. The B260, M260 and B260 are 50/200 transducers. They don't have the extra cooling or enough bandwidth units to use as a CHIRP and you risk burning out the sounder or the transducer by attempting. Hopefully the time period was short enough that you see no negative effects to the experiment.

 

[mattology]

I spoke to Airmar and Gemeco regarding the TM260. The 260 elements are capable of broadband and multiple frequency modulation, however the high element bandwidth is only around 20 khz as opposed to 80khz in the high element on the 265.

Any long term testing would put me entirely on my own with it. The TM260 may or may not have the thermal capability to deal with extended chirp operation, it simply hasn't been formally tested enough to be confirmed through airmar for all different chirp operations.

However if I want to run it at 190 khz, or 207khz , or something like that, to get stronger or different returns, there should be no issues with that at all.

The TVR, RVR, and FOM on the 200khz 260 element from 190 to 210 are not outside the ranges of the TVR, RVR, and FOVM on the 265 element from 130 to 210.

tldr; i'm not going to be chirping it in the future, but i didn't hurt it.

It's nice to know that if the B175HW element was installed in place of my B164, and hooked up to the TZT9F, there won't be any issue selecting preset frequencies including single band chirp selections.