[RFI] Mast-mount TV Pre-Amp -- Avoiding RFI & Overload?

[Jimk8mr at aol.com]

Two things to consider:
 
1.  After the digital transition next week, there will be very few  
stations left on channels 2-6. If there are none on these channels in your area,  
you can get by with a smaller antenna (element length), which will  reduce 
pickup at HF and 6 meters.   Likewise, a HIGH-PASS filter  cutting off just 
below channel 7 (174 MHz) will be the ideal situation.   This would also 
reject two meter ham signals.  I don't know if such filters  are readily 
available in the marketplace.
 
2.  Non-linearity will be a potential problem in digital TV  preamps.  If 
you are out in the weak-signal sticks,  overload and  non-linear response 
aren't as likely to be a problem, but in areas close to the  transmitters it 
could be.  You can have too much of a good thing with  digital TV.
 
 
73  -  Jim   K8MR
 
 
 
 
 
 
In a message dated 6/3/2009 11:15:18 P.M. Eastern Daylight Time,  
doc at kd4e.com writes:

Actually, a digital signal is either real good or it is real  
gone.

Here in the fringe area we need help to get the signal  strength
we need for a consistent signal lock.

If I could find a  mast-mount pre-amp which includes
bandpass and low-pass filters, to keep  non-TV signals
out, then it should do a good job.


> WA3GIN  wrote:
> THEY ARE ALL JUNK
> WITH DIGITAL YOU MAY NOT NEED A  PREAMP




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