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[. . . ] DOPPLER DIRECTION FINDER
RADIO DIRECTION FINDER KIT Ramsey Electronics Model No. DDF1
Get in on the fun of radio direction finding (RDF) with this super kit !The latest in affordable Doppler direction finding equipment available in a complete kit form . . this one even includes the receiving antenna. A must for the "fox hunter" at an unheard of price!
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Elegant and cost effective design thanks to WA2EBY ! [. . . ] Install a 324 Op amp in the U1 position, paying attention to the correct part placement. Install R9 and R10, both 33K ohm (orange-orange-orange). Install R1, 33K ohm (orange-orange-orange). Install R4, 27K ohm (red-violet-orange). Install C1, . 01uF (marked . 01 or 103 or 10nF) . Install R2, R3, and R7, all 33K ohm (orange-orange-orange). Install C2 and C3, both . 01uF (marked . 01 or 103 or 10nF). Let's finish up the components on the "component" side of the circuit board. Install R22, 10K ohm (brown-black-orange). Install electrolytic capacitor C8 (1 uF). Install R18, 100K ohm (brown-black-yellow). Install the last 324 Op amp in the U2 position. Be sure to orient the part correctly before soldering. Again, observe the correct polarity for this part. Install R31 and R20, both 33K ohm (orange-orange-orange). Install R33, 68K ohm (blue-gray-orange). Install C18 and 19, both . 01uF (marked . 01 or 103 or 10nF). Install R30, 33K ohm (orange-orange-orange). Moving to the right, install R51, 47 ohm (yellow-violet-black). 83 for the final component on the main board component side, install C38 (. 01uF) (marked . 01 or 103 or 10nF).
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Whew!Well, that's about it for the main circuit board assembly. Take a few minutes now to double check your work, especially the placement of the polarized and orientation specific components. [. . . ] If you're missing five 10K ohm resistors and received five extra 1K resistors, you can pretty much be assured that the '1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase. FACTORY REPAIR OF ASSEMBLED KITS: To qualify for Ramsey Electronics factory repair, kits MUST: 1. NOT be assembled with acid core solder or flux. [. . . ]
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