Service Manuals, User Guides, Schematic Diagrams or docs for : Boonton 59LFcoils

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59LFcoils


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file:///C|/Documents%20and%20Settings/Kenneth%20Grimm/Desktop/FOR%20BAMA/59LF-coil-construction/email.txt




 Hi Ken,
 I am forwarding the email from Alan Douglas with his measurements of the original 59LF coils, along with a picture he sent.
 I also attached the final configuration of my coils. My main coil values came out very close to Alan's measurements, but I ended up putting the coils together, with the trim caps before measuring the final values of all the coils.
 Regards,
 -Joe

 ------------------------------
 Hi Joe,

 Thanks for sharing the excellent photos. If you could provide a table of the inductance values, I think that the photos plus the values might make a nice addition to the 59LF collection.

 Thanks again,

 > To: Joe Sousa 
 > From: Alan Douglas 
 > Subject: Re: 59LF Megacycle Meter
 > X-Rcpt-To: 
 >
 > Hi,
 > Photo enclosed. This is as far as I can open the coil forms without
 > unsoldering the wires. Coils are universal-wound on ferrite slugs 7/8"
 > diameter, maybe an inch long. They're held on with wax and I can't count turns. Inductances (1 kHz) as follows, in microHenries:
 >
 > pins 1-2 pins 3-4 pins 3-5
 >
 > A: 59,      5000,         22.
 >
 > B: 5.5,     900,         2.2
 >
 > C: 2.8,     200,         11.6
 >
 > D: 1.9,     27,         *
 >
 > * = can't read because of 1k resistor in series.
 >
 > I presume you have the schematic, but pin 3 is the cold end of the coil,
 > hot end to pin 4, tap to pin 5. Feedback winding is 1 and 2.
 >
 > A .1-.25MHz, B .25-.55, C .55-1.5, D 1.5-4.5.
 >
 > The basic coil forms are by Na-Ald (Alden), standard stuff in the 1930s
 > and 40s.
 >
 > Alan

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 GAP/R, George A. Philbrick /Researches.
 Operational Amplifier Pioneer.




file:///C|/Documents%20and%20Settings/Kenneth%20Grimm/Desktop/FOR%20BAMA/59LF-coil-construction/email.txt12/19/2008 10:19:50 PM



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