[R-390] Re: Not So Much Off Topic...

[b w]

Drew,

Thanks a lot for the starting place info here. I saw the sliver jammed 
between ch 4 & 5. I found 2 references to this as being diversity, 
mobile, and fixed use. That's about all I found so far, so your 
additional info helps out. I saw a CB antenna on a truck today about 1/4 
mile from that end of the grass strip. It looked like one of those 
places where the linear is cranked way up, echo boxes installed, and a 
maybe a screaming guy inside. Okay, maybe I'm being a bit prejudiced 
here, but you know what I mean, right?

The first time was on the ground, on the takeoff roll. The other time 
was in the same spot right as the plane lifted off. It never had a 
chance and did that screaming left climb up and then down at full 
throttle. It barely missed a house. Nothing happened today and we flew 
about 5 hours without any problems. Maybe the CB guy was sleeping....

Hey Roy, wake up....


Barry nonHauser

>
>
>> So, one plane was hit by a few seconds of a stray
>> transmission on takeoff, and another was hit as it took off and made an
>> uncommanded left turn into the woods where it was obliterated into
>> several hundred pieces.
>
>
> It was intermod, I tells ya, intemod!   Never woulda' happened if the 
> receiver
> in question had a 6DC6 front end and a tracking tuned IF section:)  Then
> again, the plane would have stayed safely weighted to the ground...
>
>> Does anyone  know where to find the info in that slice of the 
>> spectrum to
>> find out what all is authorized to transmit? Maybe that would help in
>> locating whatever was propagating to the flying field. Any other ideas?
>
>
> The 72-76 MHz slice is jammed in between television channels 4 and 5.
> Along with Citizen's radio service class C (radio -controlled  devices 
> of many
> more types than just aircraft) it is also allocated for land mobile 
> communication
> and  pager services (some of which run quite high power).
>
> Once the aircraft gets any kind of altitude at all, it is open to 
> invasion by these
> sometimes strong signals.   The altitude need not be very high; note 
> the great
> increase in TV or scanner signal strengths encountered when raising 
> the antenna
> from, say, 10 feet up to 20 feet.
>
> I don't know of a specific place on the 'net to find the allocation 
> information (maybe
> Roy knows?)
>
> Drew
>