[1000mp] YF-110C in Sub Rx of FT-1000MP?

[1000mp@mailman.qth.net]

Hello Jim,

Thanks you so much for your very interesting information!

I ment the YF-110C. According to the Quick Reference of VE3YV this is a
discontinued 500 Hz filter. I found a new filter which I can buy for about
$60. I thought this would be interesting for the Sub Rx of the Mark V.

I already have a few Inrad filters (2.8, 2.1, 400 and 250 Hz for the main
Rx); they are excellent! However there is a considerable price difference
between Inrad filters and Yaesu filters, especially for us in Europe. Inrad
455 kHz filters cost about $155 + $15 shipping + 19.5% local tax. While you
can find Yaesu filter for very interesting prices, half of the price or even
less.

In accordance I have another question, which I will post in another message
in this reflector.

73!
Hans Remeeus.

Ham Radio:
PA1HR

Sites:
www.remeeus.nl
www.qsl.net/pa1hr

e-mail:
hans@remeeus.nl


----- Original Message -----
From: "Jim Smith" <jimsmith@shaw.ca>
To: <1000mp@mailman.qth.net>
Sent: Thursday, August 22, 2002 9:12 AM
Subject: Re: [1000mp] YF-110C in Sub Rx of FT-1000MP?


> Hi Hans,
>
> According to my Mk V manual the YF-110CN is a 250 Hz, 455 kHz filter
> (Available Options p. 6).  I presume, perhaps wrongly, that that is the
> filter you want to put in the Sub Rx.  Then again, maybe filter numbers
> for the MP are different from those for the Mk V.
>
> I do know that the YF-115C 500 Hz Collins filter for the Mk V Sub-Rx
> will fit and function in a 455 kHz slot in the Main Rx of a MkV.  I know
> this because I put mine there by mistake and wondered why the Sub Rx
> didn't seem very narrow on CW.  I also wondered why K6SE's MPFilters
> program showed a 500 Hz filter in the 8.2 Mhz IF and another one in the
> 455 kHz IF when I didn't have a filter in the 455 IF.  When I selected
> both filters the passband did narrow, especially the skirts.  (I've got
> to remember to pay attention to things that don't make sense.)
>
> So, the 500 Hz Collins not only physically fit the Main Rx 455 Hz slot,
> it also worked.  This must mean that the connectors for the Main and Sub
> Rx 455 Hz filters in the Mk V are physically the same and wired the
> same.  From this I would conclude that a 250 Hz 455 kHz xtal filter
> intended for the Main Rx will work in the Sub Rx.  Whether the insertion
> loss is the same or impedance levels are the same, I can't say.  In the
> days (decades ago) when I dealt with filter designers, the source and
> load impedances for a filter had a very significant effect on the filter
> frequency response.  I don't expect that that has changed.
>
> Something you might do is e-mail International Radio Corporation,
> (Inrad) and ask them how well their 250 Hz 455 kHz filter would work in
> the Sub Rx.  Alternatively, the information may be available on their
> web site.  The general consensus seems to be that the Inrad offerings
> are superior to those of Yaesu so, if you don't already have the filter,
> you might consider getting it from them.
>
> This may not help but I hope it does.
>
> 73 de Jim Smith    VE7FO