Instruction/ maintenance manual of the product HR20 Ramsey Electronics
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20 METER (14 MHZ) ALL MODE RECEIVER KIT Ramsey Electronics Model No. HR20 Here’s the ideal mini-receiver fo r catching all the busy action on 20 meters from your of fice, home or on trips! Small in .
HR20 • 2 P ARTIAL LIST OF AVAIL ABLE KI TS RA MSEY TRA NSMIT TER KITS • FM10A, FM25B Stereo Transmitters • AM1, A M25 AM Transmi tter s • TV6 Telev ision Transmitte r • FM100B Profess.
HR20 • 3 HR20 AMA TEUR RECEIVER KIT Ramsey Publication No. MHR20 Price $5.00 TABLE OF CONTENTS Introduction to the HR20 .................4 About Direct Conversion .................5 Circuit description ...........................6 Parts list .......
HR20 • 4 INTR OD UC TIO N: If you like plenty of action and DX (long distance) communications, the 20 meter Ham band is the place to be. Almost 24 hours a day there’s something interesting happening on 20 meters.
HR20 • 5 This receiver circuit is ideal for discovering ju st how simple a true “Communications Receiver” can be . That ’s right- there is a BIG diff erence between the Ra m sey HR20 and other simple short wave radio circuits we can try to build.
HR20 • 6 Advantages of any Direct Conversion receiver include: • It is simple, and therefore economical and easy to build • It is quite sensitive even with a simple antenna • Its tuning oscillator co uld even be set up to serve directl y as a transmitter VFO in a simple transceiver setup.
HR20 • 7 PARTS SUPPLIED WITH THE HR20 KIT: CAPA CIT ORS : 1 15pF ceramic disc capacit or [m arked 15 or 15K] (C4) 1 27pF ceramic disc capacitor [mar k ed 27 or 27K] (C13) 2 36pF ceramic disc capacitor [mar k ed 36 or 36K] (C1,C2) 4 .
HR20 • 8 "LEARN-AS-YOU-BUILD " RECEIVER ASSEMBLY STRATEGY: To help you learn just what exactly is going on we'll discuss the purpose of most of the components or groups of components as we go along.
HR20 • 9.
HR20 • 10 HR2 0 PART S LAY OUT DIA GRAM.
HR20 • 11 RECEIVER ASSEMBLY: 1. Install the RCA antenna jack , J1. Solder all four points. 2. Install C5, a .01µF ceramic disc signal coupling capacitor . Th is capacitor brings the signal up to the front of the PC board. Notice the long PC trace from J1 through C5 to R1.
HR20 • 12 are marked by polarity and must be installed in the proper dire ction. You’ll see that one side of the capacito r has a black band and is m arked w ith a ‘-’ sign. This is the negative side, the ot her side is the posi tive lead. Make sure you in sert the p ositive lead into the ‘+’ marked hole on the PC board.
HR20 • 13 25. Install the 9-volt battery snap connector, making sure that the red (+) and black (-) leads are co rrectl y installed . 26. Install C7, .01µF disc capacitor (marked 103 or .01 or 10nF). 27. Install C8 , 4.7-10µF e lectrol ytic capacitor.
HR20 • 14 INITIAL TESTING OF YOUR HR20: You’re now re ad y to power up and test your HR20, but before you begin take some time to sweep off your bench of any loose c omponent leads or solder splashes. A clean work area not o nl y makes testing less frustrating but also less prone to proble m s.
HR20 • 15 Align men t: Turn on whatever re f erence signal source you plan to use. This can be a regular transceiver keying a few milli watts into a dummy load, a crystal oscillator or a signal generator. Or, you can look for a known signal that you have tuned in on another receive r.
HR20 • 16 USING YO UR RECEIVER: In your first tests, you might f eel that tuning in CW and SSB stations by turning the control shaft seems tricky . Don't despair! The addition of a simple knob to the final version of your kit w ill result in more comfortable tuning right away.
HR20 • 17 SA602 audio output at the vo lum e control, and switch in a pleasant oscillator pitch (keying sidetone) which is amplified to listening leve l b y LM386. The Ramsey Electronics Universal timer kit No. UT-5 is easily adapted as a sidetone oscillator.
HR20 • 18 • MORE AUDIO POWER - ANOTHER WAY If you want to use your HR20 for casual band monitoring w hile you are busy across the room, in the shop, to share w ith a cl ass or club or group and want LOTS m ore volume, t ry building up our very inexp ensive Ra msey BN-9, 2 watt general purpose amplifier kit.
HR20 • 19 TROU BL ES HOO TI NG TIP S: PROBLEM: ALL signals are chirpy and unstable. SOLUTION: Sorry to have to sa y it , bu t this condit ion is only caused by a weak battery ! Use a fresh alkaline cell. Any strong signal forces the audi o circuit to rob voltage from th e oscillator, which cause the instability.
HR20 • 20 GENERAL NOTES FOR EXPERIENCED QRP BUILDERS: W e at Ramsey Electronic s deliberately designed the HR-series of DC receivers to be easil y available, aff ordab le and builda ble b y any person willing to follow the assembly di r ections.
HR20 • 21 BANDSPREA D AND TUNING R ANG E: The easiest way to enjoy finer tuning , if you plan to use your receiver only for checking your favorite segm ent of the band, is to ad just the oscillator coil so that your desired segment f alls within the second half of the rotation range of the tuning contro l.
HR20 • 22 FR EQU EN CY S T ABIL I TY: A kilohert z of drift is not a big deal in FM circu its or a short wave broadcast configuration, but ANY freq uency instability is ann oying when trying to recei ve CW or SSB. The varactor - controlled Lo cal Oscillator is indeed a VFO, and therefore needs all the consideration given to any VFO circuit.
HR20 • 23 another way of getting bandspread for y o ur favorite frequencies. Finally , it may be necessary to operate the counter on battery power only; connection of an AC adapter might introduce considerable hum into the receiver.
HR20 • 24 The ‘-’ side of the new capacitor is connected to the circuit trace leading to t he volume control. Mount this capacitor as close to the body of the new LM386 as possible.
HR20 • 25 CONSTRUCT ION NOTES:.
HR20 • 26 The Ramsey Kit Warranty Please read carefully BEFORE calli ng or w riting in about y our kit. Most problems can be solved without contacting th e factory. Notice that this is not a " fine print" warrant y. We want y ou to understand your rights and ours too! All Ra mse y kits will work if assembled properly.
HR20 • 27 3. F ACTOR Y REP A I R O F A S SEM BLE D KI TS: To qualify for Ramsey Electronics factory repair, kits M UST: 1. NOT be assembled with acid core solder or fl ux. 2. NOT be modified in any manner. 3. BE returned in f ully-assembled form, not partially ass embled.
HR20 • 28 HR20 AMATEUR RECEIVER KIT Quick Reference Page Guide Introduction to the HR20 . ............... 4 Circuit description ....................... .... 6 Parts list .............................. ........... 7 Schematic diagram ................
An important point after buying a device Ramsey Electronics HR20 (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 HR20 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 HR20 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Ramsey Electronics HR20 you will learn all the available features of the product, as well as information on its operation. The information that you get Ramsey Electronics HR20 will certainly help you make a decision on the purchase.
If you already are a holder of Ramsey Electronics HR20, 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 HR20.
However, one of the most important roles played by the user manual is to help in solving problems with Ramsey Electronics HR20. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Ramsey Electronics HR20 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
