Thanks VERY much Rick - lots of great info there.
It looks like I've got to read up on matching the filter impedance of
500 ohms to the 200 ohms of the Omni slots (unless there are any
suggestions?).
thanks & 73,
Barry N1EU
On Fri, Oct 14, 2011 at 2:40 AM, Rick - DJ0IP / NJ0IP <Rick@dj0ip.de> wrote:
> Barry,
>
> The XF9 series of 9 MHz filters were really top notch filters 30 years ago.
> In 1975 I replaced the 4-crystal SSB filter in my Argonaut 505 with the
> XF9-B.
> What a difference!
> Of course I had no way of measuring the bandpass curve or ripple.
> Both are dependent on the value of the external capacitors.
>
> The problem is, most of the good information I have found on these is in
> German.
> Well that's not a problem for me, but probably is for you.
>
> Take a look at the PDF at this URL:
> http://www.mydarc.de/dc4ku/HF_Eingangsteil.pdf
> It shows examples of deploying these filters.
> If you find anything in it that looks like it could be useful, contact me
> directly and I will help you translate the related paragraphs.
>
> The tables in this document show all of the specs of the various models, but
> the examples (showing component values) are for the XF9-A/B models. I don't
> know if they are also applicable for the XF9-M. Take a look:
> http://www.ve6aqo.com/images/semco2/93dec28/F.1_mod.jpg
> Again, if you need some help with the translation, give a holler!
>
> 73s
> Rick, DJ0IP
> PS another article which might help, and is in English is here:
> http://www.axtal.de/data/publ/mcf.pdf
>
>
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of Barry N1EU
> Sent: Friday, October 14, 2011 2:23 AM
> To: Discussion of Ten-Tec Equipment
> Subject: [TenTec] KVG 9Mhz Xtal Filter
>
> I recently acquired an Omni 6+ that came with a KVG XF-9M 500hz
> filter in the 9Mhz i.f. - I've read about folks using these filters
> before. But the passband through it doesn't look quite right and I
> was wondering if anybody out there knows the correct caps/resistors to
> use to match the KVG filter to the Ten-Tec slots?
>
> Thanks & 73,
> Barry N1EU
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