User manual RAMSEY HR40

[. . . ] 40 METER (7. 0 MHZ) ALL MODE RECEIVER KIT Ramsey Electronics Model No. Small in size but BIG in features: · · · · · · · · · Easily tunes SSB, CW, RTTY and AM Smooth varactor tuning of any desired 250KHz segment of the 40 meter band, easily retuned Uses the popular SA602 IC chip for outstanding sensitivity and efficient operation Front panel RF Gain, Tuning and Volume controls Efficient LM-386 Audio amplifier drives speaker or earphones with a clean, crisp audio Informative manual answers questions on receivers, hookups and uses - enhances resale value, too!Ideal companion to the Ramsey QRP-40 CW Transmitter Runs on a standard 9-volt battery Clear, concise assembly instructions lead you to a finished product that works FIRST time! HR40 HR40 · 1 RAMSEY TRANSMITTER KITS · FM100B Professional FM Stereo Transmitter · FM25B Synthesized Stereo Transmitter · AM1, AM25 AM Transmitters · TV6 Television Transmitter RAMSEY RECEIVER KITS · FR1 FM Broadcast Receiver · AR1 Aircraft Band Receiver · SR2 Shortwave Receiver · AA7 Active Antenna · SC1 Shortwave Converter RAMSEY HOBBY KITS · SG7 Personal Speed Radar · SS70A Speech Scrambler · SP1 Speakerphone · WCT20 Wizard Cable Tracer · PH10 Peak hold Meter · LC1 Inductance-Capacitance Meter RAMSEY AMATEUR RADIO KITS · HR Series HF All Mode Receivers · QRP Series HF CW Transmitters · CW7 CW Keyer · CPO3 Code Practice Oscillator · Packet Computer Interfaces · QRP Power Amplifiers RAMSEY MINI-KITS Many other kits are available for hobby, school, Scouts and just plain FUN. Write or call for our free Ramsey catalog. HR40 AMATEUR RECEIVER KIT INSTRUCTION MANUAL Ramsey Electronics publication No. MHR40 Revision C1 First printing: January 1995 COPYRIGHT 1994 by Ramsey Electronics, Inc. [. . . ] ALIGNMENT HINT FOR ALL DIRECT CONVERSION RECEIVERS: You will clearly hear the oscillator of your kit - very close to its receiving frequency, if you tune around for it on ANY shortwave radio covering the same frequency range. Even if your shortwave set does not have a BFO (beat frequency oscillator) for CW-SSB, you'll still hear a powerful `hiss or quieting' when your shortwave receiver is tuned near the frequency of the HR40. Your shortwave receiver is actually picking up the oscillator signal within the HR40! HR40 · 15 USING YOUR RECEIVER: In your first tests, you might feel that tuning in CW and SSB stations by turning the control shaft seems tricky. The addition of a simple knob to the final version of your kit will result in more comfortable tuning right away. Also, the larger the knob, the easier the tuning is. Even smoother control can be accomplished by a vernier dial, which will also provide calibration marks. Finally, if you intend to use this receiver only for monitoring or working a very specific frequency range, you can add a resistor in series with the tuning control to achieve the bandspread you want for your own application. For details, please see the upcoming section, Notes to Experienced QRP Builders. We want you to enjoy this economical receiver, whether you use it for portable listening or as a base for easy experimentation. Isn't it amazing the performance that can be achieved with just two IC chips? · TUNING SSB SIGNALS As you know, the protocol for the 160 - 80 - 40 Meter Bands is lower sideband (LSB), with Upper Sideband (USB) used for 40 - 18 - 15 - 12 - 10 Meter SSB. To check or `scan' a given band for SSB signals, tune your HR40 up from the low end for USB signals and down from the high end for LSB. · CW OPERATION A direct-conversion receiver lets you hear equal `sidebands' on either side of the zero-beat `null' of the exact frequency of the signal to which you are listening. Therefore, when adjusting the frequency of your companion Ramsey QRP transmitter, be certain that you have in fact tuned to the other station's lower sideband. The two stations will actually be several KHz apart. Because this receiver's oscillator is not shared with a transmitter, as in transceivers, there is no need for separate RIT (receiver incremental tuning). · ON THE AIR TRANS-RECEIVING Let's assume that you plan to use this receiver together with a Ramsey QRP transmitter, which provides an RF protected receiver antenna jack. While the receiver will be protected from RF damage from the transmitter, do not expect to monitor your own signal on this receiver while transmitting unless you are a QRP design expert and do not care about future factory service from Ramsey. Even with the circuit protection, the RF signal is just too much for the SA602. The transmitter signal overpowers the SA602, disrupting the internal oscillator. However, the receiver can handle the output of a crystal oscillator or VFO for frequency spotting purposes. HR40 · 16 A better operating arrangement will consist of a T-R switch, either a manual switch or break-in delay relay circuit. This switching circuit can disconnect the SA602 audio output at the volume control, and switch in a pleasant oscillator pitch (keying sidetone) which is amplified to listening level by LM386. The Ramsey Electronics Universal timer kit No. UT-5 is easily adapted as a sidetone oscillator. · SPEAKER OPERATION A fifty cent, two inch diameter speaker, lying naked on your workbench will give you a fair test of the speaker output capability. Speaker quality and welldesigned enclosures have their clear purposes! [. . . ] Often times, common sense will solve a mysterious missing part problem. If you're missing five 10K ohm resistors and received five extra 1K resistors, you can pretty much be assured that the '1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase. HR40 · 26 3. FACTORY REPAIR OF ASSEMBLED KITS: To qualify for Ramsey Electronics factory repair, kits MUST: 1. [. . . ]