Murata / Toko narrow FM filters?

[John Wilke K9RZZ]

Does anyone have an online source for the Murata SFE10.7MHy-A 110KHz or 150 khz filters for modifying FM tuners? I'm searching the web and have some emails out but still comming up short. Sure, there are some warehouses out there where I could enquire on 60,000 pieces, but other than that ... ?

Please just don't say "Digikey" or "Mouser". I've been there and still comming up short. Got a part number for either place?

Thanks,

John K9RZZ

[KW4RZ]

I get mine from Greg Gortman through Girard Westerberg's website:

http://www.dxfm.com/IF%20Filters/IF%20Filters.htm

[John Wilke K9RZZ]

Great!:)

I'll give him a try.

THANKS!

John K9RZZ

[John Wilke K9RZZ]

He's already replied to my request and will ship tomorrow.

:D

John K9RZZ

[John Wilke K9RZZ]

Parts in hand and my Icom R-7100 already apart. :D

John K9RZZ

[John Wilke K9RZZ]

Do they help? O.M.G.!!

Here's Chicago's WXRT 91.1fm, 90 miles away. Tuned in with the stock Icom R-7100 at first in AM-wide (6khz) just to prove that the station is strong enough to be heard, then I switch to FM-wide (230khz) and all that can be heard is slop from local 93.3fm.

http://members.aol.com/j999w/wxrt_pre_mod.mp3

Now here's the same station with the Murata 110 khz filters installed:

http://members.aol.com/j999w/wxrt_murata_110.mp3

Hear any difference?

:D

Pic of the stock filters (blue with red dots):

http://members.aol.com/j999w/FILTER2.jpg

Here's the band scan as I start at 107.9 and tune down to 100.1 in 100 khz steps with the stock wide filters:

http://members.aol.com/j999w/murata_230_180_bandscan.mp3


Now with the Murata 110's:

http://members.aol.com/j999w/murata_110_110_bandscan.mp3

With the stock radio, 107.9 is just slop from 107.7. The Murata filters yield Chicago with spanish music!

Ohhhhhh Yeaaaahhhhhh.

John K9RZZ

[John Wilke K9RZZ]

Well, I scared myself with this mod. While tuning around with all the covers off, the radio stopped working. :confused: No audio on any freq. or mode! I KILLED IT! :eek:

I couldn't find the problem, so I let it sit a few weeks. Today, I tackled it again and as I put the pieces back together it came back to life. Now fully re-assembled it works great. Must have been a grounding problem.

The narrow filter mod for the Icom R7100 is a sucess. :cool:

Bring on some tropo.

John K9RZZ

[KW4RZ]

Nice job, John. The difference is indeed like night and day.

[dlp85x]

Nice job, John. The difference is indeed like night and day.

That's definitely true. Before I started using the Denon TU-1500RD, I used a Pioneer car radio indoors. I didn't modify the IFs in it like you did John, but the Pioneer's performance was good even without modding. When I got the Denon, I was very disappointed with its performance out of the box, since I had bleedthrough on every adjacent frequency next to my locals (being 25 miles away from them, it meant I only had like 2 frequencies free of bleedthrough on the whole dial.) I had a neighbor mod it with two 110khz Murata filters in narrow mode, and put the factory 150s from the narrow in the wide position. The difference was like night and day. Now, the only bleedthrough I get is on 93.7 from local 93.9, and even that is easily overridden by tropo (and I suspect Es too.) I can only imagine how much of a change a filter replacement would be in a car radio like you did, since they usually have good selectivity already to begin with.