Re: LF: exciter for 137 and 500 kHz

To:	[email protected]
Subject:	Re: LF: exciter for 137 and 500 kHz
From:	Andy Talbot <[email protected]>
Date:	Sun, 7 Nov 2010 10:03:11 +0000
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Nice little prog - I'd love to see the source code :-)

Taken from that reference :-

"The calculations to derive the time constants and therefore the 90 degree frequencies, and the component values, were based on equations in the article by Dr. (Eng) Ralph Oppelt, DB2NP, published in VHF Communications Volume No. 18, Summer, 2/1987."

Does anyone have back copies of VHF Comms ???

Andy
www.g4jnt.com

On 7 November 2010 03:59, <[email protected]> wrote:

Andy

It's been a while ... but believe I used this online calculator.

http://www.werewoolf.org.je/apf.htm

Jay

----- Original Message -----

From: Andy Talbot

To: [email protected]

Sent: Saturday, November 06, 2010 9:59 AM

Subject: Re: LF: exciter for 137 and 500 kHz

Very Interesting.

Where did you find the design data for the allpass network? I've only been able to find the values for up to 3+3 allpass stages.

Mind you, at that number of chips a DSPic begins to look attractive.

Andy
www.g4jnt.com

On 6 November 2010 11:52, <[email protected]> wrote:

Nothing earth shattering ... another way to skin the cat. The 137 and 500 kHz units have been in use for a few years ... just now getting around to the write up.

http://www.w1vd.com/137-500Phasingexciter.html

Jay W1VD WD2XNS WE2XGR/2

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LF: exciter for 137 and 500 kHz, jrusgrove Re: LF: exciter for 137 and 500 kHz, Andy Talbot Re: LF: exciter for 137 and 500 kHz, jrusgrove Re: LF: exciter for 137 and 500 kHz, Andy Talbot <= Re: LF: exciter for 137 and 500 kHz, cricri Re: LF: exciter for 137 and 500 kHz, Andy Talbot Re: LF: exciter for 137 and 500 kHz, Jean-L. RAULT Re: LF: exciter for 137 and 500 kHz, cricri Re: LF: exciter for 137 and 500 kHz, Andy Talbot Re: LF: exciter for 137 and 500 kHz, Alan Melia Re: LF: exciter for 137 and 500 kHz, Johan H. Bodin Re: LF: exciter for 137 and 500 kHz, Andy Talbot Re: LF: exciter for 137 and 500 kHz, Alan Melia Re: LF: exciter for 137 and 500 kHz, John Andrews

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