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VHF LOW NOISE
PREAMP KIT
Ramsey Electronics Model No.
Boost up those weak signals without adding in unwanted noises!
The PR100 has a three section tuned circuit and a double helical
filter to allow only the desired signal to be amplified, while
attenuating signals outside the band. A perfect match for any 2
meter receiver!
• Extensive filtering for low noise operation, 1dB
noise figure!
• Three section tuned circuit and double helical filter
• Centered on 145 MHz and is 2.8 MHz wide
• 16dB Gain
• Perfect match for any VHF Receiver
• Powered through antenna feed line, or separately
• Runs on 12VDC
• Designed to fit inside of 1 1/2" PVC for quick and
easy mounting
PR100
1
PR100
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Summary of Contents for Ramsey Electronics VHF Low Noise Preamp Kit PR100
- Page 1 VHF LOW NOISE PREAMP KIT Ramsey Electronics Model No. Boost up those weak signals without adding in unwanted noises! The PR100 has a three section tuned circuit and a double helical filter to allow only the desired signal to be amplified, while attenuating signals outside the band.
- Page 2 Many other kits are available for hobby, school, Scouts and just plain FUN. New kits are always under development. Write or call for our free Ramsey catalog. PR100 PREAMP KIT INSTRUCTION MANUAL Ramsey Electronics publication No. MPR100 Revision 1.0 First printing: February, 1995 PR100...
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Page 3: Table Of Contents
Parts Layout ... 6 Strategy ... 7 Assembly Steps ... 8 Alignment ... 11 Installation ... 12 Troubleshooting ... 13 Warranty ... 14 RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 PR100... -
Page 4: Introduction To The Pr100
INTRODUCTION TO THE PR100 This amplifier is a truly necessary piece of equipment for your 2 meter receive applications. With 16dB of gain, you mount this up on your mast on the antenna to boost those weak signals to a receivable level. This results in clear, unbroken reception, and a more pleasant listening experience. -
Page 5: Schematic
The RF passes through two more tank circuits consisting of L4 and C9 in the second, and C12 and L5 in the third. Every time the RF goes through an additional tank circuit, the bandpass bandwidth of the RF is narrower. The narrower the bandwidth is before the active component of Q1, the better. -
Page 6: Parts Layout
PARTS LAYOUT DIAGRAM PARTS LIST CAPACITORS 2 2.2pF ceramic capacitors (marked 2.2) (C4, C5) 1 10pF ceramic capacitor (marked 10) (C7) 3 8.2pF ceramic capacitors (marked 8.2) (C8, C9, C10) 1 22pF ceramic capacitor (marked 22) (C6) 1 100pF ceramic capacitor (marked 100, or 101) (C2) 1 .001uF ceramic capacitor (marked .001, or 102) (C3) 1 .01uF ceramic capacitor (marked .01, 103, or 10n) (C1) FIXED RESISTORS... -
Page 7: Strategy
RAMSEY "LEARN-AS-YOU-BUILD ASSEMBLY STRATEGY" We'll start building on the left side and work our way across, installing the lower components up to the taller sized components. This will make our placing and soldering of components easy. Be sure to read through all of the steps, and check the boxes as you go to be sure you didn't miss any important steps. -
Page 8: Assembly Steps
ASSEMBLY INSTRUCTIONS: 1. Orient the PC board as in the Parts Layout Diagram. We will start with the left hand side of the board, then go to the right. 2. Install C6, the 22pF ceramic capacitor (marked 22). 3. Install C8, a 8.2pF ceramic capacitor (marked 8.2). 4. - Page 9 18. Install C1, a .01uF ceramic capacitor (marked 103, .01, or 10n). 19. Install L2, another 2.2uH inductor (green body, red-red-gold stripes). 20. Install R3, a 18 ohm resistor (brown-grey-black). 21. Install C3, a .001uF capacitor (marked 102, or .001). 22.
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Page 10: Alignment
ALIGNMENT: Alignment is fairly simple if you follow these guidelines. The first 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 need any adjusting. 1. -
Page 11: Installation
PREAMP INSTALLATION This part of the manual assumes that you have a receiver or transceiver (if using a transceiver a TR Switch 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 center of the antenna cable near your radio(see diagram on next page). - Page 12 THE PR100 Hookup is simple if you are using coax cable such as RG-58 or better 50 ohm cable. Just run a piece from the jack marked RCVR (J3) on the PR100 to the .01µF capacitor just before the radio. Then a short piece is needed to go from the capacitor to the radio.
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Page 13: Troubleshooting
TROUBLESHOOTING GUIDE: <-- To Antenna To Radio --> Problem: When I insert this in line, I don’t observe any gain in reception. Solution: There are several causes to the problem, but the major one is that the preamp has been assembled incorrectly. Check Q1 for correct installation, then check J3 for 12VDC. -
Page 14: Warranty
But on rare occasion a sour component can slip through. All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. - Page 15 ANY item in which we find excessive problems or damage due to construction methods. To assist customers in such situations, Ramsey Electronics, Inc., reserves the right to solve their needs on a case-by-case basis.
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Page 16: Fishers Station Drive Victor, New York
ADDITIONAL SUGGESTED ITEMS • Holder for PC Board/Parts Ramsey HH3 • Desoldering Braid Ramsey RTS08 • Digital Multimeter Ramsey M133 RAMSEY ELECTRONICS, INC. 590 Fisher Station Drive Victor, New York 14564 Phone (585) 924-4560 (585) 924-4555 www.ramseykits.com VHF LOW NOISE PREAMPLIFIER Quick Reference Page Guide How it Works ...
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