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Author Topic: INRAD IF Noise Reduction Mod  (Read 2690 times)
NW9R
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Posts: 574




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« on: December 31, 2012, 08:02:58 PM »

Anyone have any experience with the INRAD IF Noise Reduction mod for the FT-1000?  Worth it, noticeable improvement?  I know two (2) fellows here that did the roofing filter mods and removed them as the radio sounded terrible afterwards....just curious on the IF Noise Reduction mod...

Appreciate any info, and drop me an email also if you wish...

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K8AC
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Posts: 1527




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« Reply #1 on: January 01, 2013, 01:24:47 PM »

I had an FT-1000MP Mark V and tried both the noise reduction mod and the roofing filter mod at different times.  I thought the noise reduction mod of some value when operating 10 and 12 meters, but the roofing filter mod was a better bet for the kind of operating I was doing at the time - lots of CW contesting on 20 and 160 where the roofing filter sometimes helped with IMD.  Can't imagine why the other guys' radios sounded bad with the roofing filter - mine didn't.  I don't recall what the bandpass of the filter was, but it shouldn't have been narrow enough to affect SSB signals, unless one was listening to "hi-fi" extended bandwidth signals.  As I recall, there were a lot of menu items where you could alter the BFO offsets and I wonder if something they did there might have caused a problem. 

73, Floyd - K8AC
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N1RND
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Posts: 103




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« Reply #2 on: January 09, 2013, 03:19:43 PM »

I have a FT-1000MP (plain) and I just installed the IF mod.  I can tell you it is worth it.  I spent countless hours researching all the mods for the MP on the internet.
Here is a great link that will explain it better and advise you on a "test" that will allow you to decide if it will work for you.
http://lists.contesting.com/_yaesu/1998-05/msg00099.html
If you operate CW the K9AN CW audio mod is good to.
Check out my posts on the Yahoo FT-1000 users groups.
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NW9R
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Posts: 574




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« Reply #3 on: July 28, 2015, 06:45:20 AM »

Well, I had the Noise reduction mod done professionally by my tech and honestly, I noted the sensitivity down a bit with it in the radio.
The receiver sensitivity actually improved without the Inrad mod, so I had it removed.  Not really worth it.  A roofing filter mod would likely be a better option.
Per my tech, they (INRAD Noise Reduction Mod), simply have no place in a fully up to spec. FT-1000MP Mark-V or Mark-V Field. I noted when I was using the radio with the mod, the receiver seemed a bit "down" in sensitivity (no failure just less sensitivity) and with mod removed, perked up a tad (noticeable).

I also asked about Menu 8-4 Flat/Tuned RF Amplifier and got a really good dissertation about it:
Operating hint; for best receiver performance and consistent S-meter accuracy band to band, it is recommended to keep menu 8-4 set to FLAT. The TUNED amps. for 160, 80, 40 meters all have about 6dB less gain than the FLAT RF amplifier, with the exception of 10 meters where the TUNED amp. has more gain than the FLAT amp., all of which skew S-meter calibration when there are active. The receiver sensitivity is excellent on 10 meters with the FLAT amp. (menu 8-4 kept set to FLAT). IPO when turned on (illuminated IPO button) results in a consistent -10dB as it turns off the FLAT amp. IPO is handy for 160, 80, 40 meter operation during noisy summer QRN and etc., but reduces S-meter readings by 10dB.

Just wanted to share that info also with the owners of the 1000 series, one heck of a great radio.



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