Ramsey Electronics VHF Low Noise Preamp Kit PR100の取扱説明書

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  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - 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 M Hz wide • 16dB Gain • Perfect match for any VHF Receiver • Powered through antenna f eed line, or separatel y ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 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 Transmitter R A MSE Y RECEIVER KITS • FR1 FM Broa dcast Receiver • A R1 A ircraft Band Receiver • SR2 Shortwav e Receiver • SC1 Shortwav e Conv ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 3

    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 ............. .......... ............. ........... ...... 5 Parts Layout .......... .......... ...... ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 4

    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. This results in clear, unbroken reception, and a m ore pleasa nt listening e xperience. T ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 5

    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. The narrow ban dpass all ows Q1 to devot ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 6

    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 .001uF ceramic capacito ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 7

    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 . Be sure to read thro ugh a ll of the steps, and check the boxe s as you go to be sur ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 8

    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 8.2pF ceramic capacitor (marked 8 .2).  4. Install C4, a 2.2pF ceramic capacitor (marked ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 9

    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 .001 uF capacitor (marked 102, or .001).  22. Insta ll R5, a 30 0 ohm resistor (orang ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 10

    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.  2. Screw L4 in 8 turns.  3. Scre w L5 in 8 turns. If you have the equip ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 11

    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). Ca ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 12

    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. Finally, you ne ed t o connect the Preamp to the antenna and you ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 13

    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. If those check out, go through assembly step ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 14

    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. The very fact tha ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - page 15

    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. DO NOT send a separate letter; include all correspon ...

  • Ramsey Electronics VHF Low Noise Preamp Kit PR100 - 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 Assemb ly Steps ............... .......... .. ...

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