User manual RAMSEY HR20

[. . . ] 20 METER (14 MHZ) ALL MODE RECEIVER KIT Ramsey Electronics Model No. HR20 Here's the ideal mini-receiver for catching all the busy action on 20 meters from your office, home or on trips!Small in size but BIG in features: · · · · · · · · · Easily tunes SSB, CW, RTTY and AM Smooth varactor tuning of any desired 250KHz segment of the 20 meter band, easily retuned 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 QRP20 CW Transmitter Runs on a standard 9-volt battery Clear, concise assembly instructions lead you to a finished product that works FIRST time! [. . . ] 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 20 - 18 - 15 - 12 - 10 Meter SSB. To check or `scan' a given band for SSB signals, tune your HR20 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. 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 HR20· 16 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!A reasonable speaker in a box delivers a pleasant listening volume. On the other hand, the LM386 indeed can deliver more audio output punch than is developed in our HRseries kits. For example, our FM receivers, using the same LM386 audio IC, deliver more volume. [. . . ] DO NOT send a separate letter; include all correspondence with the unit. Please do not include your own hardware such as nonRamsey cabinets, knobs, cables, external battery packs and the like. Ramsey Electronics, Inc. , reserves the right to refuse repair on 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. [. . . ]