To: | <[email protected]> |
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Subject: | Re: LF: exciter for 137 and 500 kHz |
From: | "Alan Melia" <[email protected]> |
Date: | Sun, 7 Nov 2010 13:19:13 -0000 |
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References: | <000c01cb7da9$23b1a1e0$8d01a8c0@JAYDELL><[email protected]><000d01cb7e30$2f5041f0$8d01a8c0@JAYDELL> <[email protected]> |
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Hi Andy Yes I have that one....I'll look out a scan Alan G3NYK ----- Original Message ----- From: "Andy Talbot" <[email protected]> To: <[email protected]> Sent: Sunday, November 07, 2010 10:03 AM Subject: Re: LF: exciter for 137 and 500 kHz > 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 <[email protected]> > > *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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