[1000mp] difference between Yaesu XF-... and YF-... filter types

[Scott Manthe]

Hi Uwe,
What Pete says is not really the case, but he's not really incorrect 
either. Read on....

I have a couple XF-xxx filters in my Field and they're on boards. It 
seems Yaesu has had a pretty sloppy naming system, because what Pete 
describes can be the case or not, depending on the age of the filter and 
some other, unknown to me, factors.

At some point Yaesu changed the prefix of the board mounted filters to 
YF, to try and lessen the confusion. But, having said that, XF filters, 
mounted on boards, that have the same numbers as the corresponding YF 
numbered filters should work. I have an XF-110C in my sub-receiver that 
is an 500Hz 8 pole mechanical filter and works great.

At any rate, I actually have a mixture of XF/YF filters in my Mark V 
Field and I have not significant attenuation of signal strength when I 
go from 2.4kHz to 250Hz. You may just have a bad filter.

73,
Scott, N9AA

Peter Connors wrote:
> Uwe,
>
> As I understand it, the YFxxx denotes a plug-in printed circuit board 
> with the corresponding XFxxx filter mounted on it.
> That apart, on a strong carrier I have the same indicated signal 
> strength (S9+30) from 6kHz down to 250Hz on my MkV Field with a 
> complete set of YF/XF filters.
>
> 73, Pete, G4PLZ
>
> Uwe Fleischer wrote:
>> Hi altogether,
>>
>> does anybody know the difference between the Yaesu XF-. and the YF-. 
>> filter
>> types? I purchased the XF-110CN/XF-114CN 250Hz filters that were 
>> recently
>> offered here on this list for my Mk-V Field.
>>
>> If I tune the RX to the maximum signal strength of a stable (CW) carrier
>> now, it seems, that the signal is 2 S-units weaker with the 250 Hz 
>> filters
>> than with the 400 Hz filters (from Inrad). Of course I tried to 
>> re-tune to
>> the max signal after switching the bandwidth from 400 to 250, in case 
>> that
>> filter curves would have a slightly different centre frequency.
>>
>> Now I discovered in the manual, that Yaesu lists the YF-. type as 
>> optional
>> filters for the Mk-V (Field). Has this any relation to my problem?
>>
>> Thanks in advance, and I hope you all were successful in working 5A7A 
>> in any
>> mode on any band ;-)
>>
>>
>> 73 de Uwe, DL8UF
>>
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