Instruction/ maintenance manual of the product AA7 Ramsey Electronics
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AA7 • 1 ALL BAND HF , VHF , UHF ACTIVE ANTENNA Ramsey Electronics Model No. AA 7 • Great fo r perking up s canner reception. • Dual preamp HF-VHF/UHF front panel s witching. • Circuit based on true active antenna research. • Performance rivals units costing many times more ! • Front panel RF gain contr ol.
AA7 • 2 PARTI A L LIST OF A V A IL ABLE KITS RA MSEY TRA NSMIT TER K IT S • FM10, FM25B FM Stereo Transmi tters • FM100 Super Pr o FM Transmitter • MR6 Mod el Rocket Tracki ng Transmitter • .
AA7 • 3 AA7 ACTIVE ANTENNA KIT Rams ey Publication No. MAA7 Manual Price Only: $5.00 TABLE OF CONTENTS Introduction to the AA7 .................... ................. ........ 4 Circuit and Device Description ....................... ........... 4 Active Antennas: Circuits W ith a Purpose .
AA7 • 4 INTR ODU CTI ON TO THE AA7 We believe that you will discover and ag ree with us that your new AA7 is the best VALUE in a true re ceiver antenna. In its s implest form, an “act ive antenna” is a small ante nna going throug h an RF pr eamplifier to a receiver.
AA7 • 5 The dual-g ate MOSFET amp lifier circuit (Q 1), selected with S1 in the “o ut” position is designated the HF preamp circuit, due to the exce ptionally low noise level of its operation. This is ideal for enhan cing weak C W -SSB signals. This amplif ier perform s the true “a ctive antenna” fu nction of the AA7.
AA7 • 6 figure of the amplifier circ uit which amplifies the signal from the ante nna rod before it gets to th e receiver's RF input. We mention these things, with no need to get into a lot of .
AA7 • 7 Needle Nose Pliers (RS64-1844) Small Diagonal Cutters (RS64-1845) ADDITIONAL SUGGESTED IT EMS Soldering Iron Holder/Cleaner (RS-64-2078) Holder f or PC Board/P arts (RS64-209.
AA7 • 8.
AA7 • 9 AA 7 PA RTS LAYO UT D IAG RAM.
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 trimm ings do not beco me lodged in PC-board solder connections.
AA7 • 11 14. Install R3, 100K [brown-black-yellow]. 15. If you have co mpleted Steps 4 through 14 correctly, you now have the 4 holes for Q1 surrounded by other parts, mak ing it easy to find! Examin e Q1, the dual-ga te MOSFET. The sch ematic diagram shows why it has 4 leads.
AA7 • 12 24. BEFORE connecting battery or conducting any tests, PLEASE recheck each of the pr eceding steps, looking es pecially for: • quality of solder conne ctions • correct orientation o.
AA7 • 13 rather than only a re ceive r 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 on e o r both of the transistors.
AA7 • 14 Unusual oscillations in receiver: So me portable receivers not enclosed in metal cases may break into oscilla tion wh en conne cted to any RF preamplifier. Try reducing the AA7 gain control and make sure good grounds are on the interconnecting coax cables.
AA7 • 15 The Ramsey Kit W arranty Please read c arefully BEFORE call ing or writi ng in abo ut your kit. M ost pro blems can be solved without contacting the facto ry. Notice that thi s is not a "fin e print" warranty. We want you to u nderstan d your rights a nd ours to o! All Ramsey kits w ill work if assemble d properly.
AA7 • 16 AA7 AC TIV E AN TENN A Quick Reference Page Guide Introduction to the AA7 ................ .................... . 4 Circuit and Device Description ............ .............. 4 Active Antennas: Circuit s With a Purpose . ....... 5 Schematic Diagram .
An important point after buying a device Ramsey Electronics AA7 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Ramsey Electronics AA7 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Ramsey Electronics AA7 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Ramsey Electronics AA7 you will learn all the available features of the product, as well as information on its operation. The information that you get Ramsey Electronics AA7 will certainly help you make a decision on the purchase.
If you already are a holder of Ramsey Electronics AA7, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Ramsey Electronics AA7.
However, one of the most important roles played by the user manual is to help in solving problems with Ramsey Electronics AA7. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Ramsey Electronics AA7 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
