My antenna is still located inside my house on the 2nd floor.
This morning I added a 1090MHZ filter and saw this change in about 8 hours.
Before the filter:
http://i300.photobucket.com/albums/nn30/adsbjunkmail/after_zpsiruoyb65.jpg
After the filter:
http://i300.photobucket.com/albums/nn30/adsbjunkmail/before_zpslucwxboj.jpg
Really looking forward to finding someone to mount the antenna on my roof for me.
Should get much better 360 degree coverage.
Great improvement! What kind of filter are you using?
I may sound like a fool but what exactly does a filter do/how do I go about getting one?
I vaguely know from reading about and it limiting to 1090Mhz to stop other interference? I’m just guessing here… but I’d love to see an improvement like that.
Kind regards,
Filters basically reduced anything other than 1090MHZ signals to a point you can receive weaker aircraft that unwanted stuff is covering.
About getting one there are several available for a cost … if you have the tools you can build one … but I dont have ways of
etching PC Board so Im looking at a inexpensive way to do it. (inexpensive for the wife 
)
Haha yeah I’d rather buy one that I knew was going to work I guess, knowing my luck if I made it myself it wouldn’t work or worse it may explode.
I’ll just have to take a look somewhere
FA is shipping these bandpass filters with their equipment:
http://www.minicircuits.com/MCLStore/ModelInfoDisplay?14336849550840.49443381746337767 Center freq is 1065 MHz. I received mine yesterday and plugged it in.
you might try building the one i use and described here: keptenkurk.wordpress.com/2014/1 … -b-filter/
Has been succesfully repeated by FA user Edwin van den Berg.
/paul
Paul, in your design, do the tuning screws go into the tubes? They don’t look to be long enough in your drawing. I made a similar filter (which didn’t work) and the screws went into the tubes. It was made after this design: w6pql.com/microwave_filters.htm
I’ve been using one of those VBFZ-1065+ filters for around two months now and am quite happy with it.
If anyone wants one, you may want to go ahead and grab it while they’re in-stock. They’ve just recently become available again and were sold-out for the better part of the past month.
http://www.minicircuits.com/pdfs/VBFZ-1065+.pdf
Matt
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[quote=“mattbna”]
Forget that idea, they want $105 US to ship to Canada. Totally ridiculous!!! 
Perhaps you could contact them by phone or e-mail and see if there is another option? They’re one of the most reputable companies in that business and build/sell some of the best gear you can get. Granted, it’s not their fault that it is more expensive to ship outside of the US, but $105 is pretty steep.
$105 US was your total for the filter and shipping to Canada? What shipping options do they offer when you enter an address in Canada? I see 4-5 options each for FedEx and UPS for shipping within the US.
I just ordered another one for a future feed site install and my ground shipping (cheapest option - not in a hurry) from New Jersey down to Tennessee was $9.47 US.
Matt
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Total was $145 US and change. AND that was the slowest shipping optioned offered UPS Canada Ground.
They may have a good business rep in your opinion, but they’ve lost this customer.
If shipped by UPS, they are also including the customs fees/taxes. For example, I can ship it to you via USPS for $21, but it won’t include that.
Thank you for the offer N456TS, but I’ll leave it for now.
…Tom
Sometimes the automated feeds to UPS/FEDEX etc have issues, I’m sure if you called them Monday the price is not that. Most likely an automated price quote error has cropped up there.
I saw your pictures! Very nicely built. The screws go into the tubes but stay clear from them. This presents a capacitance where the tube is the inductance. So both form a tunable LC circuit. You’re right: the drawing doesn’t reflect that, hope the pictures compensated that 
Is your filter way off? I followed Adam Alicajic way of tuning with a noise generator and rtl scanner for the rough part and the dump1090 stats for the last bit…
/paul
[quote=“mattbna”]
Yes, that’s the one.
You can see the difference in this graph.
The vertical line is around the time I added filter.
http://i300.photobucket.com/albums/nn30/adsbjunkmail/24hourssnap_zpslkh7vtom.jpg
The graphs on the left of that line show how much it improved in the previous 24 hours without the filter.
