Instruction/ maintenance manual of the product SA7 Ramsey Electronics
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SA7—1 BROADBAND RF PREAMP ———— 100 KHz - 1.3 GHz • High gain - 2 0 dB Bro adband coverage. • Exce llen t rev ie w in F eb. 90, 73 Ma gazi ne. • Two stage feedback d esign ensures stable o peration. • Runs on 12-15 VDC @ 15 mA . • Com plete with a pplic at ions and hook-up i nstr uction s.
SA7—2 SA 7 I N T R OD UC TIO N: A "preamplifier" gives an initial boost, measured in decibels, to the level of a signal before it is processed by tuned circuits, filters, amplifiers, mixers, detectors or other circuit stages. Preamps may be designed for either RF or audi o use and may be either t uned or broadbanded.
SA7—3 P ARTS SUPPLIED WITH SA7 KI T Capacitors 1 2.2 pF capacitor [axial style, green body with red bands] (C6) 1 4.7 or 5 pF di sc capacitor (C1) 3 .
SA7—4 REQUIRED, NOT SU PPLIED 8-15 VDC power source your choice of powe r on-off switching RF input and output connectors (your choice of type) enclosure of your choice, if SA7 is not mounted inside receiver or counter, etc.
SA7—5 SA7 PRE-A MP ASSEMB L Y PROCEDURE Soldering 15 parts to a PC board is not a big job, but good performance of the SA7 r equires attention to keeping all leads as short and neat as possible.
SA7—6 5. Install C5, .01 uF. Notice that C5 lines up with the DC voltage supp ly points on the PC board. If you have y our red (+) and bl ack (-) supply wires ready, they could be installed now while correct polarity is on your mind. 6. Install R4, 1K ohms (brown-black-red) .
SA7—7 Installation of C6 and R6. The styl e of these components might be new to you, but don't be concerned. We' ll get them in right. Having inst alled all the conventional re sistors according to color code, note that the remaining resistor-like part is mark ed with 6 bands; the firs t two at one end should both be red.
SA7—8 Procedure for installing SMT R6: 1. Unpack from cardboard protective holder and study how R6 is made, usi ng the magnifier if necessary. 2. Notice that bot h ends are metallic - these are the soldering points. 3. Lightly pre-tin the PC boar d trace point s where R6 is to be positioned.
SA7—9 USING YOUR SA7 PRE-A MP The very best way to find out what your S A7 can do, and also cannot do, is to set one up right from the beginning with the input and out put conne ctions most practical for your uses.
SA7—10 FINAL NOTES A BOUT BRO A DBAND PRE- A MPS Yes, the Ramsey SA7 or PR2 RF pre- amp will give that prom ised boost to the signal st rength of that distant FM broadcast station that your wife, sist er or dad wants to tune in without so much static.
SA7—11 BROADBAND "ACTIVE A NTENN A" For situations where a shor t or indoor receiving antenna is nee ded, the SA7 preamp will give considerably improved performance even if the antenna is little more th an a collapsible whip or sh ort length of wire.
SA7—12 AN T SA 7 Fr e q . = 6. 28 L x C 1 A d di ng a t uned R F in put.
SA7—13 WA R N I N G : Under no circumstances should transmitter power be applied to the SA7. Although this seems common-sense, most receivers are in transceiver configuration and one slip of the mike key will blast your little SA7 to La-La Land.
SA7—14 The Ramsey Kit Warranty Please read carefu lly BEFORE ca lling o r writin g in a bout your ki t. Most pr oblem s can be sol ved w ithout contact ing t he fact ory. Notice that this is not a "fine print" wa rr anty. We want you to understand your rights and ours too! All Ram sey kits will work if assemble d properly.
SA7—15 Ramse y Electroni cs projec t kits a re packed with pri de in the U SA. If you bel ieve we packed an in correc t part or om itted a pa rt clearly indicated in your assembly manual as supplied with the ba sic kit by Ramsey , please write or call us with information on the part you need and proo f of kit purchase 3.
SA7—16 Published by Ramse y Electronics, Inc. Copyright 1994 All rights reserved. Ramsey Electronics, Inc. 590 Fishers Station Drive Victor, NY 14564 Phone (585) 92 4-4560 Fax (585) 92 4-4555 Call o.
An important point after buying a device Ramsey Electronics SA7 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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If you already are a holder of Ramsey Electronics SA7, 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 SA7.
However, one of the most important roles played by the user manual is to help in solving problems with Ramsey Electronics SA7. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Ramsey Electronics SA7 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
