700 mhz notch filter

[ScannerDude244]

notice on DSD+FL the noise floor was jumping up and down like crazy. I open up to see what was going on in sdrsharp and notice LTE first net between 758-768 that was never there before. I have a 700mhz yagi about 20ft on a pole with about 40ft of lmr 400 to a drop amp. The site is about 25miles away any 700mhz filter recommendation?

 

[900mhz]

what happens when you bypass that amplifier?

 

[ScannerDude244]

what happens when you bypass that amplifier?

Same results

 

[rr60]

I had great results with DTV bullet filter for cellular. Small money.

 

[ScannerDude244]

got a link?

 

[kb5udf]

Same problem here as first net has proliferated like weeds. I looked at many bullet filters but none appeared suitable. Please,
please share which one works. All I've seen so far that looks suitable is a pricey commercial Westel filter.

 

[ScannerDude244]

Update I went ahead and order this filter BPF-800-EN from scannermaster. It did help "some" but not by much. It stops 765mhz I need it to stop a little higher to 768mhz on the low side. I did email Dale from Par he told me the offending transmitters are too close to your desired passband for a filter to be realized. So IDK

 

[OpSec]

Are you trying to listen to some specific 700 MHz frequencies, or scan everything? It may be easier to make a notch filter that only passes what you want to listen to and notches out the rest instead of trying to notch out FN and pass the rest.

For instance, in my work vehicle I have a notch filter that passes one specific 700 MHz frequency (vehicular repeater) but notches out the rest.

Just thinking out loud here...