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  1. Yaesu-FT-980
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FT-980 Performance Measurments: Sherwood Engineering

 

Not sure if everyone looks at Sherwood Engineering's receiver performance specifications, but the FT-980 was measured many years ago. It is interesting to contrast it with new rigs.



If you so inclined, please read the "Terms Explained" link on the page: It is actually also a description of issues, test procedures, and some historical data ... a good read.

My thoughts from the table:
1. In terms of receiver sensitivity, the FT-980 still holds up as an excellent receiver (right up there with the FTdx-101D and Elekraft K3).
2. It is also excellent wrt receiver noise floor, actually beating the FlexRadio 6700.
3. Where performance starts to fall off is fliter leakage ("Ultimate Filter") as the modern direct-sampling DSPs seem to generally outperform the older analog filtering.
4. Likewise, the 3rd-order wide and narrow dynamic blocking range falls behind many of the modern rigs (although this is true of most of the rigs in this and previous generations).

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-Mat Breton, N8TW
 

If we have all of the Fox-Tango Newsletters covering the '980...I seem to recall a filter change/addition that helps to fix leakage and blow-by issues. Inrad may stiock the required filters. Back in the day, these were Fox-Tango parts and I'll see the occasional unit show up on the auction site.

73 - Fred, N8YX
 

Inrad experimental #906 :) We have a section in the Files->Mods section. Inrad still has it in stock and sells it for $125, but it will have two side-effects I believe:

1. The additional insertion loss will slightly degrade receiver sensitivity (I believe)
2. While good for CW/SSB/Digi, it will limit AM/FM bandwidth I believe ... probably only noticeable for audiophiles.

If anyone in the group has one, maybe they report out on its effects and improvements? If anyone is going to throw one out, please send it my way :)

--
-Mat Breton, N8TW
 

I modded a TS-930S with an Inrad roofing filter which also kills the AM bandwidth. How I ended up fixing that problem was to buy one of their blank roofing filter carrier boards and designed my own 6-pole filter to put on the carrier board. Switching between the two is done by another board and a set of relays; the 6-pole/6KHz B/W filter is inline with the 4-pole OEM in AM and the Inrad 8-pole/2.4KHz B/W unit is the active filter in all other modes. Both really work to tighten up the receiver.

A similar arrangement might be utilized with the '980. My "mule" will probably get the mod and I'll work out the particulars to apply to the others.

73 - Fred, N8YX
 

?I changed the 2,7kHz 455KHz Murata for a 455kHz 2,1kHz Inrad. Now the radio is 250gr heavier and the Width control works properly. In pair with a couple of modern digital rigs

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