10000s of crashed air planes due to NDB interference
Funny you should mention that , the
band is not as
big as it first seam's
NDB Rx are standard AM pass band , some
TRF with carrier
amplifiers , the Null is derived from the carrier
and anything
inside the pass band will introduce , errors in
the bearing
or prevent a resolve ,errors will be compounded by
the jammer / main beacon
distance , if the beacon is 500 miles on and the A/C
directly over head
then a 1 mW signal will effectively
jam the system
120 second tx could give the wrong
heading for a
10 mile distance
As the system is not tactical , there are no anti jamming
provisions
there is no carrier phase modulation , rotation or
frequency shift
, the null is simply amplitude , provided
by a loop Ae and
sense , automation is confined to carrier /
sense switching
Odd allocation really ?
G,
Sent: Friday, December 20, 2013 6:28 PM
Subject: Re: LF: OPERA overload?
Hello Bob,
Am 20.12.2013 18:54, schrieb Bob Raide:
G et all;
Things have changed over this pasted year or
so. Many more new stations have come on and these newbies are
running lower power and RXers that may not be up to what some of the veteran
ops are using. There really isn't allot of room for QRO in the 630 meter
band
Do you get complaints? What is the argumentation?
What do they say? Same as here? 10000s of crashed air planes due to NDB
interference? Overloaded RX because your signal is 30 dB above the noise in 1 Hz
NBW?
One day the A-Team will come and shoot down the antenna and PA,
http://www.youtube.com/watch?v=_MVonyVSQoM
;-)
Or is it maybe just envy, sometimes?
I assume Jay doesn't see a
problem when you go QRO sometimes, like Markus doesn't when i do. And i do not
when Markus does or DK6SX/p on MF or DK2DB. It's just all fine :-)
73,
Stefan/DK7FC
