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From: "Dr. David Kirkby" <drkirkby@kirkbymicrowave.co.uk>
Date: Thu, 23 Aug 2018 21:31:22 +0100
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To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Anyone good with Elsie?
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On Thu, 23 Aug 2018 at 12:08, Chris Wilson <dead.fets@gmail.com> wrote:

>
> Hello  LF'ers
>
> Is anyone able and willing to advise on my band pass RX filter design
> please? I have made a band pass filter for 137kHz reception and
> checked it with my SDR in real time. It is shifted a little high and I
> am wondering what I need to change to pull it a bit lower? Any
> practical advice or component values welcome. Adjustability would be
> nice! Thanks
>

If its any help, I have an HP 4284A precision LCR meter with a basic
uncertainty of 0.05%. It has a little over 8000 frequency points, that are
VERY poorly spaced in the range of 20 Hz to 1 MHz. (There is 20 Hz, and
20.01 Hz, but nothing between 750 kHz and 1 MHz). After I attempted to set
the frequency to 137 kHz, the display indicating 136.986 kHz. So if you
want some components measured at very close to 137 kHz, I have an
instrument able to do it. You can either send them to me or come here if
it's convenient.

I don't have any spectrum analyzer or VNA that will work at those
frequencies though.

G8WRB

Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
https://www.kirkbymicrowave.co.uk/
Tel 01621-680100 / +44 1621-680100

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<div dir=3D"ltr"><div><div dir=3D"ltr">On Thu, 23 Aug 2018 at 12:08, Chris =
Wilson &lt;<a href=3D"mailto:dead.fets@gmail.com">dead.fets@gmail.com</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Hello=C2=A0 LF&#39;ers<br>
<br>
Is anyone able and willing to advise on my band pass RX filter design<br>
please? I have made a band pass filter for 137kHz reception and<br>
checked it with my SDR in real time. It is shifted a little high and I<br>
am wondering what I need to change to pull it a bit lower? Any<br>
practical advice or component values welcome. Adjustability would be<br>
nice! Thanks<br></blockquote><br></div><div>If its any help, I have an HP 4=
284A precision LCR meter with a basic uncertainty of 0.05%. It has a little=
 over 8000 frequency points, that are VERY poorly spaced in the range of 20=
 Hz to 1 MHz. (There is 20 Hz, and 20.01 Hz, but nothing between 750 kHz an=
d 1 MHz). After I attempted to set the frequency to 137 kHz, the display in=
dicating 136.986 kHz. So if you want some components measured at very close=
 to 137 kHz, I have an instrument able to do it. You can either send them t=
o me or come here if it&#39;s convenient. <br><br></div><div>I don&#39;t ha=
ve any spectrum analyzer or VNA that will work at those frequencies though.=
 <br><br></div><div>G8WRB<br></div><div><br>Dr David Kirkby Ph.D C.Eng MIET=
<br>Kirkby Microwave Ltd<br>Registered office: Stokes Hall Lodge, Burnham R=
d, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.<br>Registered in E=
ngland and Wales as company number 08914892<br><a href=3D"https://www.kirkb=
ymicrowave.co.uk/" target=3D"_blank">https://www.kirkbymicrowave.co.uk/</a>=
<br>Tel 01621-680100 / +44 1621-680100<br><br></div></div>

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