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Ramsey Electronics PR100 manual

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Table of contents for the manual

  • Page 1

    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 2.8 MHz wide • 16dB Gain • Perfect match for any VHF Receiver • Powered through antenna f eed line, or separately ?[...]

  • Page 2

    PR100 y 2 R A MSE Y TRANSMITTER KITS • FM100B Professional FM Stereo Transm itter • FM25B S ythesized Stereo FM Tr ansmitter • MR6 Model Rocket Tracki ng Transmitter • TV6 Television Transmitter RAMSEY RECEIVER KITS • FR1 FM Broa dcast Receiver • AR1 A ircraft Band Receiver • SR2 Shortwav e Rec eiver • SC1 Shortwav e Conv erter RA M[...]

  • Page 3

    PR100 y 3 VHF LOW NOISE PREAMP KIT Ramsey Publication No. MPR100 Manual Price Only: $5.00 TABLE OF CONTENTS Introduction to the PR100 ............ ................. 4 How it W orks ................ ............. .............. ...... 4 Schematic ................ .............. ................. ...... 5 Parts Layout ....... ................ .......[...]

  • Page 4

    PR100 y 4 INTR OD UC TIO N TO TH E PR1 00 This amplifier is a truly necessa ry 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 listeni ng experience. The filteri[...]

  • Page 5

    PR100 y 5 The RF passes through tw o more tank circuits consisting of L4 and C9 in the second, and C12 a nd L5 in the third. Every time the RF goes through an additional tank circuit, the bandpass bandwidth of the RF is narrowe r. The narrowe r the bandwidth is before the active component of Q1, the better. The narrow bandpass allows Q1 to devote i[...]

  • Page 6

    PR100 y 6 PA RTS LAY OUT D IAGRA M PA RTS LI ST 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, C 10)  1 22pF ceramic capacitor (marked 22) (C6)  1 100pF ceramic capacitor (marked 100, or 101) (C2)  1 .001uF ceramic capacitor [...]

  • Page 7

    PR100 y 7 RAMSEY "LEARN-AS-YOU-BUILD ASSEMBLY STRATEGY" We'll start building on the lef t side and work our way across, installing the lower components up to the taller sized comp onents. This will make our placing and soldering of componen ts easy. Be sure to read through all of the steps, and check the boxes as y ou go to be sure y[...]

  • Page 8

    PR100 y 8 ASSEMBLY INSTRUCTIONS:  1. Orient the PC board as in the Parts La yout Diagram . We will start with the left hand side of the bo ard, then go to the right.  2. Install C6, the 22pF cer amic capacitor (m ark ed 22).  3. Install C8, a 8.2pF ceramic capacitor (marked 8.2).  4. Install C4, a 2.2pF ceramic capacitor (marked 2.2). ?[...]

  • Page 9

    PR100 y 9  18. Insta ll C1, a .01uF cera mic ca pacitor (m arke d 103, .01, o r 10n).  19. Install L 2, another 2.2uH in ductor ( green bod y, red- red-gold str ipes).  20. Install R3, a 18 ohm resistor (brown-grey-black).  21. Install C3, a .001uF capacitor (marked 102, or .001).  22. Install R5 , a 300 ohm resist or (orange- black [...]

  • Page 10

    PR100 y 10 ALIG NM EN T: Alignment is fairly simple if y ou follow these guidelines. 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 need a ny adjusting.  1. Screw L3 in 8 tu rns.  2. Screw L4 in 8 turn s.  3. Screw L5 in 8 tu rns. If you have the equipmen[...]

  • Page 11

    PR100 y 11 PR EA MP IN STA LLA TION This part of the manual assumes that you have a r eceiver or transceiver (if using a transc eiver 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 ante nna cable near your radio(se e diagram on next page). Care [...]

  • Page 12

    PR100 y 12 THE PR100 Hookup is simple if you are using coax cable such as RG-58 or better 50 oh m cable. Just run a piece from the jack marked RCVR (J3) on th e PR100 to the .01µF capacitor just before the radi o. Then a short piece is needed to go from the capacitor to the radio. Finally, you need to connect the Preamp to the antenna and you are [...]

  • Page 13

    PR100 y 13 TROUBLESHOOTING GUIDE: Problem: When I insert this in line, I do n’t observe an y gain in recepti on. Solution: There are severa l 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. If those check out, go through assembly steps again t[...]

  • Page 14

    PR100 y 14 The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about y our kit. Most problems can be solved wit hout contacting the factory. Notice that this is not a "fine print" wa rrant y. W e want you to unders tand your rights and ours too! All Ramsey kits w ill work if assembled properly. The very fact that yo[...]

  • Page 15

    PR100 y 15 4. BE accompanied by the proper repair fee. No repair will be undertaken until we have rece ived the MINIMUM repair fee (1/2 hour labor) of $25.00, or authorization to ch arge it to your credit card acc ount. 5. INCLUDE a description of the proble m and legible return address. DO NOT send a separate letter; include all correspondence wit[...]

  • Page 16

    PR100 y 16 VHF LOW NOISE PREAMPLIFIER Quick Referenc e Page Guide How it W orks ....................... ................ 4 Schematic .............. .............. ................ 5 Parts Layout ................. ................. ...... 6 Strategy .............. ................. ............. ... 7 Assembly Steps ............... .................[...]