[NSRCA-discussion] Radio Issue

[David Cotton]

A few years ago I had the same thing with my futaba 9zap. I lost 3 planes before I found the problem. I had a synthesizer tx module that started to drift off frequency. I have a spectrum analyzer and can therefore monitor the tx power and frequency; I  put the tx unit out in the sun and monitored it for 30 mins. The output frequency drifted in the Texas heat and the rx went into failsafe mode.  When I sent it in they said the power was down, but I am 100% certain that was not the fundamental problem. 
 
Dave Cotton, fm  BlackBerry 

-----Original Message-----
From: "Eddie Batchelor P.D." <perkinsrx at centurytel.net>

Date: Sun, 14 Jun 2009 04:47:32 
To: <nsrca-discussion at lists.nsrca.org>
Subject: Re: [NSRCA-discussion] Radio Issue


Very interesting that you post this. 
I recently had almost the same issue with my JR9303 and 770PCM Rx. Radio went into hold and crashed the plane( 2 horizontal rolls turned into endless rolls until it crashed . 
new plane and upon take off had some down trim due to DEPS growing as the plane warmed up. elevator trim did nothing and finally I got on the stick -still nothing - then all of a sudden it pitched straight up. 
  
called tony and sent him TX and both 770 Rx's. all he could find was tx power was down about 20%.  I don't know if that low power output cold cause the hold situation or not. Haven't put it back ina plane yet :-) 
  
any help would be appreciated. 
  
edie 
----- Original Message ----- 
From: Snaproll4 at aol.com <mailto:Snaproll4 at aol.com>  
To: nsrca-discussion at lists.nsrca.org <mailto:nsrca-discussion at lists.nsrca.org>  
Sent: Saturday, June 13, 2009 12:57 PM 
Subject: [NSRCA-discussion] Radio Issue 

 
Hi Everyone, 
  
        I have a serious problem with my radio and I was wondering if anyone has any experience with this. 
  
  
        I have a JR 10X that has performed flawlessly for 8 years.  It is 72mhz with a top JR receiver. Today while flying it went into failsafe mode twice.  It only faded for a split second and then came back. It never lost battery power, so I reasoned that it 's not the battery, voltage reg or switch. I assume it must be the transmitter, receiver or antennae.  I can put another receiver in it, but the only way to test is to put the plane in the air. 
  
        How would I know if it is the transmitter?  BTW, range checking on the ground with the motor running turned up nothing. 
  
  
TIA, Steve 
  
             

 
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