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Ramsey Electronics AA7 Instruction Manual - Aa7 Active

Manual is about: All band HF, VHF, UHF Active Antenna

Summary of AA7

  • Page 1

    Aa7 • 1 all band hf, vhf, uhf active antenna ramsey electronics model no. Aa7 • great for perking up scanner reception. • dual preamp hf-vhf/uhf front panel switching. • circuit based on true active antenna research. • performance rivals units costing many times more! • front panel rf gain control. ...

  • Page 2

    Aa7 • 2 partial list of available kits ramsey transmitter kits • fm10, fm25b fm stereo transmitters • fm100 super pro fm transmitter • mr6 model rocket tracking transmitter • am1, am25 am transmitters ramsey receiver kits • fr1 fm broadcast receiver • ar1 aircraft band receiver • sr2 shortwave recei...

  • Page 3: Aa7 Active

    Aa7 • 3 aa7 active antenna kit ramsey publication no. Maa7 manual price only: $5.00 table of contents introduction to the aa7 ............................................. 4 circuit and device description .................................. 4 active antennas: circuits with a purpose ................ ...

  • Page 4

    Aa7 • 4 introduction to the aa7 we believe that you will discover and agree with us that your new aa7 is the best value in a true receiver antenna. In its simplest form, an “active antenna” is a small antenna going through an rf preamplifier to a receiver. Generally, the actual antenna may be of sev...

  • Page 5

    Aa7 • 5 the dual-gate mosfet amplifier circuit (q1), selected with s1 in the “out” position is designated the hf preamp circuit, due to the exceptionally low noise level of its operation. This is ideal for enhancing weak cw-ssb signals. This amplifier performs the true “active antenna” function of t...

  • Page 6

    Aa7 • 6 figure of the amplifier circuit which amplifies the signal from the antenna rod before it gets to the receiver's rf input. We mention these things, with no need to get into a lot of engineering detail, just to let you know that "active antennas" are a serious topic among contemporary receive...

  • Page 7

    Aa7 • 7 needle nose pliers (rs64-1844) small diagonal cutters (rs64-1845) additional suggested items soldering iron holder/cleaner (rs-64-2078) holder for pc board/parts (rs64-2094) desoldering braid (rs-2090) assembly instructions the following assembly steps are given in accord with the learn-as- ...

  • Page 8

    Aa7 • 8.

  • Page 9

    Aa7 • 9 aa7 parts layout diagram.

  • Page 10

    Aa7 • 10 • solder all wires or pins of the part, whether the 2 wires of a resistor or the 3 or 4 wires of a transistor. • trim or nip all excess wires extending beyond each solder connection, taking care that wire trimmings do not become lodged in pc-board solder connections. Soldering the aa7 print...

  • Page 11

    Aa7 • 11 14. Install r3, 100k [brown-black-yellow]. 15. If you have completed steps 4 through 14 correctly, you now have the 4 holes for q1 surrounded by other parts, making it easy to find! Examine q1, the dual-gate mosfet. The schematic diagram shows why it has 4 leads. Insert q1 so that the squar...

  • Page 12

    Aa7 • 12 24. Before connecting battery or conducting any tests, please recheck each of the preceding steps, looking especially for: • quality of solder connections • correct orientation of q1 and q2 • correct orientation of the electrolytic c4 • correct battery wire polarity • correct values for res...

  • Page 13

    Aa7 • 13 rather than only a receiver or scanner, make sure it is not possible to transmit by accidentally pressing a mike button or cw keyer. Transmitted rf into the aa7 is likely to ruin one or both of the transistors. Transistor placement information: both transistors may be ordered from ramsey el...

  • Page 14

    Aa7 • 14 unusual oscillations in receiver: some portable receivers not enclosed in metal cases may break into oscillation when connected to any rf preamplifier. Try reducing the aa7 gain control and make sure good grounds are on the interconnecting coax cables. Receiver overloading, heterodynes, ima...

  • Page 15

    Aa7 • 15 the ramsey kit warranty please read carefully before calling or writing in about your kit. Most problems can be solved without contacting the factory. Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All ramsey kits will work if assembled ...

  • Page 16

    Aa7 • 16 aa7 active antenna quick reference page guide introduction to the aa7 .....................................4 circuit and device description ..........................4 active antennas: circuits with a purpose ........5 schematic diagram ..........................................6 parts layo...