Instruction/ maintenance manual of the product VHF Low Noise Preamp Kit PR100 Ramsey Electronics
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PR100 y 1 VHF LOW NOISE PREAMP KIT Ramsey Electronics Model No. PR100 • Extensive filtering for low noise operation, 1dB noise figure! • Three section tu ned circuit and doubl e helical filter • Centered on 145 MHz and is 2.
PR100 y 2 R A MSE Y TR A NS MITTER KI TS • FM100B Profess ional FM Ster eo Transmitter • FM25B S ythesized Ster eo FM Transmitte r • MR6 Mod el Rocket Tr acki ng Transmitter • TV6 Television T.
PR100 y 3 VHF LOW NOISE PREAMP KIT Ramsey Pu blication No. MPR100 Manual Price Only: $5.00 TABLE OF CONTENTS Introduction to the PR100 ......... .............. ...... 4 How it W orks ............ .......... .......... .............. ... 4 Schematic ..
PR100 y 4 IN TRO DU C TI ON TO TH E PR 10 0 This amplifier is a truly ne cessary piece of equipment for y our 2 meter receive applications. W ith 16dB of gain, y ou mount this up on yo ur mast on the antenna to boost those w e ak signals to a receivable level.
PR100 y 5 The RF passes throug h two more tank circuits consisting of L4 and C9 in the second, an d C12 and L5 in the third. Every time the RF goes through an additional tank circuit, the bandpass bandwidth of the RF is narrow er. The narrow er the bandwidth is before the active componen t of Q1, the better.
PR100 y 6 PA RTS LAY OUT D IAGRA M PA RTS LIST CAPACITORS 2 2.2pF ceramic capacitors (marked 2.2) (C4, C5) 1 10pF ceram ic capacitor (marked 10) (C7) 3 8.2pF ceramic capacitors (marked 8.2) (C8, C9, C 10) 1 22pF ceram ic capacitor (marked 22) (C6) 1 100pF ceram ic capacitor (marked 100, or 101) (C2) 1 .
PR100 y 7 RAMSEY "LEARN-AS-YOU-BUILD ASSEMBLY STRATEGY" W e'll start building on the left side and work our way across, installing the lower components up to the taller sized comp onents. This will make our placing and soldering o f components easy .
PR100 y 8 ASSEMBLY INSTRUCTIONS: 1. Orient the PC board as in the P arts La y o ut Diagr am . We will start with the left hand side of the bo ard, then go to the right. 2. Install C 6, the 22pF cera mic capacit or (m arke d 22). 3. Install C8, a 8.
PR100 y 9 18. Inst all C1, a . 01uF ce ra mic capacit or (m arke d 103, .01, o r 10n) . 19. Insta ll L2, anot her 2. 2uH in ductor ( green b ody, red-re d-gold s tripes) . 20. Install R3, a 18 ohm resistor (brown-grey- black). 21. Install C3, a .
PR100 y 10 ALI G NM EN T: Alignment is fairly simple if y ou follo w these gui delines . The f irst step is to back all of the lugs out of L3, L4, and L5 until they reach the top of the cans. FL1 should be ok, and won’t ne ed any adjusting. 1. Scre w L3 in 8 turns.
PR100 y 11 PR EA MP INSTA LLA TI ON This part of the manual assumes that y o u have a re ceiver or transceiver (if using a tr ansceiver a TR S witch is needed, like our RFS-1). This preamp operates off a 12 volt DC supply which is connected to a 2.2 µH inductor then to the cente r of the antenna cable near your radio(see diagra m on next page).
PR100 y 12 THE PR100 Hookup is simple if y ou are using coax cable such as RG-58 or better 50 oh m cable. Just run a piece from the jack marked RCVR (J3) o n the PR100 to the .01µF capacitor just before the radi o . Then a short piece is needed to go from the capacitor to the radio.
PR100 y 13 TROUBLESHOOTING GUIDE: Problem: W h en I inser t this in lin e, I do n’t obser ve an y gain in rece pti on. Solution: There are seve ral causes to the problem, but the major one is that the preamp has been asse mbled incorrectly. Ch ec k Q1 for correct installatio n, then check J3 for 12VDC.
PR100 y 14 The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about y our kit. Mos t problems can be solved w it hout contacting the factory . Notice that this is not a "f ine print" wa rranty. W e want you to und ers tand your rights and ours too! All Ramsey kits w ill work if assembled properly.
PR100 y 15 4. BE accompanied b y the proper repair f ee. No repair will be undertaken u ntil we ha ve received the MINIMUM repair fee (1/2 hou r labor) of $25.00, or authorization to char ge it to y our cred it card acc ou nt. 5. INCLUDE a descriptio n of the problem and legible return addre s s.
PR100 y 16 VHF LOW NOISE PREAMPLIFIER Quick Referenc e Page Guide How it W orks ................ ............. .......... 4 Schematic ........... .......... ............. .......... 5 Parts Layout ............. .............. .......... ... 6 Strategy .
An important point after buying a device Ramsey Electronics VHF Low Noise Preamp Kit PR100 (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 VHF Low Noise Preamp Kit PR100 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 VHF Low Noise Preamp Kit PR100 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Ramsey Electronics VHF Low Noise Preamp Kit PR100 you will learn all the available features of the product, as well as information on its operation. The information that you get Ramsey Electronics VHF Low Noise Preamp Kit PR100 will certainly help you make a decision on the purchase.
If you already are a holder of Ramsey Electronics VHF Low Noise Preamp Kit PR100, 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 VHF Low Noise Preamp Kit PR100.
However, one of the most important roles played by the user manual is to help in solving problems with Ramsey Electronics VHF Low Noise Preamp Kit PR100. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Ramsey Electronics VHF Low Noise Preamp Kit PR100 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
