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Garmin GTN 750 & 650

RocketAviator

By RocketAviator
in General Mooney Talk

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RocketAviator Mentor

RocketAviator

Posted
Posted

Anyone still having issues with their units breaking squelch?

I've now had three units replaced, new coaxial cable replaced again, antennas rebound, grounding checked & rechecked. . Everything the avionics shop AND Garmin have thought of done. Still breaking squelch. The AV shop says Garmin shipping another new 750 to try....

Very disappointed at this point.

Piloto Grand Master

Piloto

Posted
Posted

Check on the installation manual for setting the squelch threshold. Most likely there is source of noise in the plane that causes the squelch to open. Even a faulty circuit breaker can cause noise. Magnetos, alternators, voltage regulators, strobes, transponders can cause noise. Pull all the CBs and push one at time to spot the source. Have your cell phone and tablet turned off also. Maybe is the intercom squelch that is opening and not the 750. Set the intercom squelch to Isolate.

 

José

RocketAviator Mentor

RocketAviator

Posted
  • Author
Posted

I have set the threshold in all units was the first thing tried. Currently set at 75.

650 rock solid never an issue.

Seems to break squelch at frequency around 122.8 and several other lower frequency. Does not appear as often in the 133 range. I'm going to start logging the freq. I fly again today, tomorrow and Saturday all cross country so should get fair amount of opportunities to log freq.

Very interesting about the charging as I have several USB items IPad, Clarity SV. But I have had issues before these items were installed. Will isolate and see good suggetion.

Thanks keep up and input

MB65E Grand Master

MB65E

Posted
Posted

I had a bad comm problem on a gtn635. (No Nav just com/GPS) it would brake squelch and be un readable during transmitting. I took the power connection (ANR for the headsets) away from the area where the helmet plugs in it. That seamed to do the trick. Also during that time I changed the mic on my helmet which also improved comm function. Impedance issue I'm guessing. The latest 650/750 combo that was installed in two heli's works solid!! But Early on I would loose GPS signal on one of the 750s. It's not an issue now with current software.

Good luck!

-Matt

helitim Proficient

helitim

Posted
Posted
I have set the threshold in all units was the first thing tried. Currently set at 75.

The side tone default setting on our 650 was 62.5 I dropped it down to 45 and the problem has resolved so far.

I find it intersting that yours works at such a high setting.

N601RX Grand Master

N601RX

Posted
Posted

There has been known cases of certain elts and their antenna reradiating signals. It might be worth removing the coax from the elt and disabling it to see if the problem goes away. They are very close in freq to the part of the band that you are having a problem with.

  • 5 months later...
Rustler Rising Star

Rustler

Posted
Posted

Rocket--

 

See Garmin SB 1526 (4/1/2015). This is a software fix performed by your avionics shop.

Houman Mentor

Houman

Posted
Posted

easier said than done, when you have a partner that only flies 5h a year and not willing to put any money for the avionics, mind you we just put 10K for a full interior redo.

I would love a JPI 930 and get rid of all the analogue gauges...

Houman Mentor

Houman

Posted
Posted

It's hard to wear out a plane at 5 hrs per year...

-a-

Well this year I might hit about 80h in the Mooney, so not too bad for my 1st year of ownership, in a way it is great to have a co-owner that flies 5h but still pays half of the upkeep, but I understand where he dos'nt want to do more avioncs upgrade.

carusoam Grand Master

carusoam

Posted
Posted

Houman has an ideal partner relationship...

One pilot minimizes wear.

The other pilot minimizes corrosion and keeps instruments exercised.

Best regards,

-a-

rbridges Grand Master

rbridges

Posted
Posted

I had to send back my ps engineering audio panel because it kept clipping the intercom. Turned out that I had an earlier unit and firmware upgrades fixed it. Works perfect now. May be something to consider with your gtn.

Bob - S50 Grand Master

Bob - S50

Posted
Posted

easier said than done, when you have a partner that only flies 5h a year and not willing to put any money for the avionics, mind you we just put 10K for a full interior redo.

I would love a JPI 930 and get rid of all the analogue gauges...

 

Something you might consider asking your partner (there are four of us owning our plane).  Our agreement allows members to own different percentages of the plane (technically the LLC).  As a matter of fact, I own almost twice as much of the LLC as the others do.  I did that to allow us to get a nicer plane.  We all still pay the same monthly costs ($250/month) and operating costs ($25/hour dry).  The only time it will make a difference is if we sell the plane.  When that happens, I'll get a larger share of the sale price that is proportional to the percentage I own.

 

Our agreement calls for a majority vote to install or upgrade avionics.  If we pay extra, that is, a one time assessment, our stake in the plane in terms of dollars is increased in proportion to dollars spent.  However, it also allows that with the group's permission, fewer than all members can pay for 100% of the install/upgrade if they wish.  If they do, their percentage of ownership increases in proportion to the cost of the upgrade.

 

So in your case.  Let's say you each have $50,000 invested in the plane.  You each own 50% of it.  You want to install the JPI 930 and it will cost you $10,000 to do that (just picked a number for simplicity).  If your partner allows you to do that, but only if you agree to pay for it, you would then have $60,000 invested and he would still have $50,000 invested.  You would own $60,000/$110,000 or 54.54% of the plane and he would own 45.46% of the plane.  Nothing else would change.  The percentage would only matter when you agree to sell the plane.

 

You both get the benefit of the new equipment and your partner gets it for free.  You have essentially given him an interest free loan and will get some/all/extra of his money when you sell, depending on how much you sell the plane for.

 

Bob

Houman Mentor

Houman

Posted
Posted

Something you might consider asking your partner (there are four of us owning our plane).  Our agreement allows members to own different percentages of the plane (technically the LLC).  As a matter of fact, I own almost twice as much of the LLC as the others do.  I did that to allow us to get a nicer plane.  We all still pay the same monthly costs ($250/month) and operating costs ($25/hour dry).  The only time it will make a difference is if we sell the plane.  When that happens, I'll get a larger share of the sale price that is proportional to the percentage I own.

 

Our agreement calls for a majority vote to install or upgrade avionics.  If we pay extra, that is, a one time assessment, our stake in the plane in terms of dollars is increased in proportion to dollars spent.  However, it also allows that with the group's permission, fewer than all members can pay for 100% of the install/upgrade if they wish.  If they do, their percentage of ownership increases in proportion to the cost of the upgrade.

 

So in your case.  Let's say you each have $50,000 invested in the plane.  You each own 50% of it.  You want to install the JPI 930 and it will cost you $10,000 to do that (just picked a number for simplicity).  If your partner allows you to do that, but only if you agree to pay for it, you would then have $60,000 invested and he would still have $50,000 invested.  You would own $60,000/$110,000 or 54.54% of the plane and he would own 45.46% of the plane.  Nothing else would change.  The percentage would only matter when you agree to sell the plane.

 

You both get the benefit of the new equipment and your partner gets it for free.  You have essentially given him an interest free loan and will get some/all/extra of his money when you sell, depending on how much you sell the plane for.

 

Bob

Thanks Bob, I had tought of something like this, but here in canada the plane is under my personal name for my 50% and his company for his 50%. I had tought of having the equipement installed at my cost after signing an agrrement with my partner that when he sells his half, I would get 50% of the cost of the equipement and installation back.

Something I have to work towards...

Guest

Guest

Posted
Posted

Looking at the Transport site I see that the Rocket is in your name personally and his company name as you described. Why not transfer it to a numbered company which each of you owns 50/50? If either of you has an accident you put at risk your assets, more protection in a numbered company.

I wouldn't have a partner who only flew 5 hours per year. It's only a matter of time before he damages your half of the plane. I'm surprised that you can even get insurance to cover him.

Clarence

Houman Mentor

Houman

Posted
Posted

Looking at the Transport site I see that the Rocket is in your name personally and his company name as you described. Why not transfer it to a numbered company which each of you owns 50/50? If either of you has an accident you put at risk your assets, more protection in a numbered company.

I wouldn't have a partner who only flew 5 hours per year. It's only a matter of time before he damages your half of the plane. I'm surprised that you can even get insurance to cover him.

Clarence

Well Clarence, he has about 9500 hours flight time as an ATP and has another plane as well, that is why he can get insured, and much cheaper than my 200h total and 65h on the Mooney.

I had talked to my accountant about putting the plane in my current IT consulting company, but since he is straighter than an arrow, he advised me against it. In any case, my partner is looking to sell his half in the near future, so who knows how it will work out...

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