[Yaesu] FT101E AM Filter

[Eric Dobrowansky]

There is a modification, which is documented in the FT101 service manual, 
which re-wires the mode switch to select the optional filter "position" in 
AM mode instead of CW mode. Basically, one of the wafers on the mode switch 
selects the SSB filter for SSB, TUNE, and AM modes, while the optional 
filter slot is selected in CW mode. When the optional filter is not present, 
as when new, the filter board has two caps that couple the stock SSB filter 
to the optional filter slot, essentially making the one filter work in both 
slots.  For the CW narrow filter installation, you simply remove the two 
caps and solder in the filter. To use an AM filter, you need to remove the 
caps, solder in the filter, then re-wire the mode switch to select the 2nd 
filter slot on AM mode rather than CW mode.

The FT101 series was never really designed for an AM filter. However, after 
the radio grew in popularity, especially with the 11-meter crowd in the late 
70s, the mod became well known and simple enough to perform. The actual 
XF-30B 6.0KHz filter was originally offered for the FR-101 receiver of the 
FR/FL 101 twins.


Eric
KE2D

----- Original Message ----- 
From: "Dan Cotsirilos" <dcsfree at worldnet.att.net>
To: <w2nra at optonline.net>; "cwoodside" <n1muq at optonline.net>
Cc: <yaesu at mailman.qth.net>
Sent: Saturday, March 12, 2005 9:31 AM
Subject: Re: [Yaesu] FT101E AM Filter


> The 101E manual does not show how to install a AM filter only a CW one. I 
> put a 101E filter board in a 101E that had a AM filter on it that worked 
> perfect in the 101E it came out of.
>
> When I inter-changed boards they were not compatible each other. the AM 
> 101E was mute in the "AM" mode and the other one still received narrow 
> "AM" even with the AM filter on the board. I.E. it was still using the SSB 
> filter to receive. it seems some change must be made to the radio itself 
> for the AM filter to work on a 101E? Does Inrad provide this info?  Dan
>
>
>
>
>
>
> ----- Original Message ----- 
> From: "Art Searle W2NRA" <w2nra at optonline.net>
> To: "cwoodside" <n1muq at optonline.net>
> Cc: <yaesu at mailman.qth.net>
> Sent: Saturday, March 12, 2005 6:55 AM
> Subject: Re: [Yaesu] FT101E AM Filter
>
>
>>
>> InRad makes it at:
>>
>> http://www.qth.com/inrad/
>>
>> 73,
>> Art
>> W2NRA
>>
>> cwoodside wrote:
>>> These seem to be very hard to find. But I am still looking so I thought 
>>> I would ask again. Looking for the AM filter for a Yaesu FT 101E { 
>>> *XF-30B } Thanks Charlie N1MUQ
>>> *
>>> _______________________________________________
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>>> Yaesu at mailman.qth.net
>>> http://mailman.qth.net/mailman/listinfo/yaesu
>>>
>>>
>>
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