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A special note to newcomers: Ten meters is generally a daylight hours
band. If you finish your receiver at midnight, please wait until after
sunrise before expecting to hear much of anything!
RECEIVER SENSITIVITY
Your FM receiver features sensitivity under 1 uv. Radio Hams constantly
marvel at how an FR-10 displayed at hamfests tunes in dozens of hand-
held QSO's on the premises without an antenna connected! You can
expect to monitor local repeater and simplex transmissions easily, using
a simple groundplane style antenna. The receiver also responds very
well to the addition of a low-noise pre-amplifier such as the Ramsey SA-
7/PR-2. A versatile receiver accessory is the Ramsey AA-7 HF-VHF
Active Antenna, which doubles as a preamplifier with other antennas in
addition to the excellent performance of its own whip.
ADDING AN LED POWER "ON" INDICATOR
For many people, a pilot lamp to indicate "power on" is more than a nice
touch. They expect it and depend on it, reminding us that "real radios
glow in the dark!" Adding a simple LED power-on indicator to your
Ramsey kit receiver is easy. All you need is the LED itself and a small
1K to 2.2K resistor.
Study the PC traces between the positive battery supply wire and the
on-off switch. The unused connectors on top of your switch are an ideal
point to get the + DC voltage needed for the anode (longer lead) of the
LED. Plan where and how you wish to install the LED in your enclosure.
Locating the LED immediately above the on-off switch is logical and
ideal. The simplest way to make a good installation is to drill a neat hole
just slightly smaller than the diameter of the LED. Then, enlarge the hole
a little bit at a time, just enough to let the LED be pressed in and held
firmly. The resistor may be connected to either the anode or cathode of
the LED, but the anode MUST go to + DC, with the cathode connected
to the nearest common ground point. If you are wondering why we did
not include these pennies worth of parts with your kit, you can believe
any of the following reasons:
(1) We wanted to stretch your battery budget: with the LED drawing
FR-10 ? 22
Fixed Resistors
?
1 2 ohm [red-black-gold] (R22)
?
3 270 ohm [red-violet-brown] (R6,9,20)
?
1 470 ohm [yellow-violet-brown] (R5)
?
2 1K ohm [brown-black-red] (R11,12)
?
3 10K ohm [brown-black-orange] (R7,17,19)
?
1 18K ohm [brown-gray-orange] (R18)
?
1 33K ohm [orange-orange-orange] (R14)
?
4 47K ohm [yellow-violet-orange] (R4,8,13,21)
?
1 100K ohm [brown-black-yellow] (R16)
?
1 470K ohm [yellow-violet-yellow] (R15)
?
1 1 megohm [brown-black-green] (R10)
Capacitors
?
1 10 pF (C5)
?
2 22 pF (C2,19)
?
1 47 pF (C12)
?
2 56 pF (C3,4)
?
5 100 pF [marked 100, 101, or 101K] (C1,6,9,10,22)
?
1 220 pF [marked 220 or 221] (C18)
?
6 .001 uF [marked .001 or 102 or 1 nF] (C7,8,20,23,24,25)
?
9 .01 uF [marked .01 or 103 or 10 nF]
(C11,13,16,17,21,26,28,29,31)
?
1 .1 uF [marked .1 or 104] (C34)
?
1 1.0 uF electrolytic (C27)
?
3 4.7 or 10 uF electrolytic (C15,30,36)
?
4 100 to 220 uF electrolytic (C14,32,33,35)
Controls and Hardware
?
1 Printed circuit board
?
3 10K ohm potentiometer (R1,R2,R3)
?
1 DPDT push switch (S1)
?
1 PC mount RCA jack (J1)
?
1 PC mount subminiature speaker jack (J2)
?
1 9-volt battery bracket
?
1 9-volt battery snap-on clip
REQUIRED, NOT SUPPLIED
?
1 9-volt alkaline battery
?
1 VHF antenna with cable terminated in RCA-style plug or adapter
?
1 Speaker or headphones
FR-10 ? 7
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