Up until 1993, transmitters in all events had to go through a transmitter
check. In 1972, I had to process my transmitter between rounds in the
pylon races. I got a closer look at pylon racing than I really wanted when
an out of control model dived into the pit area at full throttle from very
high altitude. My last transmitter was at the 1993 Nats. I was still
flying my 22 year old single stick Proline and the frequency display showed
a frequency of 53.40000. Nobody makes transmitter with lab quality
components anymore. Proline quality decreased when the original designer
lost his company. By 1995, transmitter testing was no longer required at
the Nats, at least for sailplanes.
At 03:22 PM 5/23/2005, you wrote:
Years ago when I competed in the pylon wars at the Nats and at the NMPRA
Championship (National Minature Pylon Racing Association) the
transmitter check by oscilloscope was one of the first items that was
looked at in our extensive safety checklist before you could compete.
These 5 lb. birds at 180 mph were and are dangerous and the "powers that
be" wanted to make sure you had a good radio link. Over the years
several radio notables (such as Aberle, Waters and Orr) if I remember
right served yeoman's duty checking the competitor's transmitters. I
often stayed around until it traffic got light and asked the radio
person what I was looking at on the 'scope and they would explain what
you wanted and didn't want to see on the screen.
The clean 3/4 watt signal (all the FCC allows) and potentiometer
linearity I witnessed by the JR users going through the transmitter
check was enough to convert me in 1983 and I've flown JR ever since.
Nope.....I'm not sponsored by JR.....just love their radio!
As to splatter there were definitely some transmitters that were not
"spot on frequency" and there used to be radio techs that tuned the
receivers to the crystals you had as some crystals would be at the high
or low end of the frequency band and somehow the tech could tune the
receiver to more closely match the crystal in an effort to improve the
range / radio link. I'm referring to radios used prior to my switch to
JR.
BCNU
Bruce Hobbs
-----Original Message-----
From: John Erickson [mailto:[EMAIL PROTECTED]
Sent: Monday, May 23, 2005 1:31 PM
To: Tom Kallevang; John Derstine; [EMAIL PROTECTED]; Soaring List
Subject: [RCSE] "Splatter"
This idea of a "clean" transmitter is an interesting problem. I know
this
list has a lot of radio professionals. Can a transmitter "leak" the
signal?
I know I've experienced this in some big hand launch contests when you
have
12 radios on at the same time. I've had hits when I know no one is one
my
channel.
If it's true, shouldn't a transmitter frequency check be required at the
start of any large contest?
JE
--
Erickson Architects
John R. Erickson, AIA
> From: Tom Kallevang <[EMAIL PROTECTED]>
> Date: Mon, 23 May 2005 10:43:21 -0700 (PDT)
> To: John Derstine <[EMAIL PROTECTED]>, [EMAIL PROTECTED],
[email protected]
> Subject: REply: [RCSE] Had a chance to try the Freq Checker this
weekend
>
> This would be a huge
> loss to the the R/C community, as you can actually eyeball if a Tx is
> clean or not without a scope and an advanced degree.
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