[NSRCA-discussion] Radio Issue

[Ron Van Putte]

This discussion reminded me of my Futaba 9Z's performance at last  
year's Nats.  My airplane suffered loss of control during a flight,  
but I was able to land it successfully by elevating the transmitter  
antenna..

It was later pointed out that the 9Z's antenna is not really  
connected to the RF module until the "ball" at the lower end of the  
antenna was engaged.  That meant the large diameter antenna link had  
to be fully entended.  I had always pulled the antenna out one small  
diameter link when doing work on the ground.  As mentioned by Troy, I  
had persistently degraded the module's output by overheating the  
output transistor by my practice, until the transmitter's output was  
down to 40% of normal.

Ron VP

On Jun 13, 2009, at 1:22 PM, Snaproll4 at aol.com wrote:

> Troy,
>        Every point you made made me cringe.  Transmitter has never  
> been serviced.  I do occasionally run it without the attenna ( only  
> for very short periods).  Module is a PCM(J72P). I do not have  
> another module.  If  you think that could be the problem, I can  
> order one right away. Thanks.
>
> In a message dated 6/13/2009 2:08:39 P.M. Eastern Daylight Time,  
> troy at troynewman.net writes:
> Last time the module was in for service?
>
>
>
> Last time the TX was in for service?
>
>
>
> Over time the module output can weaken. It usually comes from  
> running the TX in the shop without the antenna on it…this causes  
> the module to heat up…reducing the life of the output transistor.
>
>
>
> But if you radio has not been in for service in those 8yrs its well  
> past time. I usually send my TX’s in every other year for service.  
> They check it and make sure nothing is a problem.
>
>
>
>
>
> I think the newer synth modules are better on the heat issue  
> without the antenna, but it’s still a matter of time of prolonged use.
>
> What module do you have in it….do you have another module to use?
>
>
>
>
>
>
>
> Troy
>
>
>
> From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca- 
> discussion-bounces at lists.nsrca.org] On Behalf Of Snaproll4 at aol.com
> Sent: Saturday, June 13, 2009 10:58 AM
> To: nsrca-discussion at lists.nsrca.org
> 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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