Hr-80 • 1 80 meter (3.0 mhz) all mode receiver kit ramsey electronics model no. Hr-80 • add our case and knob set for a finished ‘pro’ look. Cases match all ramsey products. Small in size but big in features: • easily tunes ssb, cw, rtty and am • smooth varactor tuning of any desired 250khz segment ...
Hr-80 • 2 ramsey transmitter kits • fm-10 fm stereo transmitter • fm-1,2,3,4 fm wireless microphones • pb-1 telephone transmitter ramsey receiver kits • fr-1 fm broadcast receiver • ar-1 aircraft band receiver • sr-1 shortwave receiver • aa-7 active antenna • sc-1 shortwave converter ramsey hobby ki...
Hr-80 • 3 hr-80 amateur receiver kit ramsey publication no. Mhr-80 price $5.00 table of contents introduction to the hr-80 ............... 4 about direct conversion ................ 5 circuit description ........................... 6 parts list ......................................... 7 schematic d...
Hr-80 • 4 introduction: our hr-40 and hr-80 models are thought of as “best for beginners” because hams with a novice or technician license can operate cw in the 40 and 80 meter bands. If you like plenty of action and dx (long distance) communications, the 40 meter ham band is the place to be. Almost...
Hr-80 • 5 therefore, we are pleased to assure you that your manual for the hr-80 receiver and the receiver circuit itself have been designed with an understanding of typical operating needs and expectations for the 80 meter band. This receiver circuit is ideal for discovering just how simple a true ...
Hr-80 • 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 could even be set up to serve directly as a transmitter vfo in a simple transceiver setup. A common pr...
Hr-80 • 7 parts supplied with the hr-30 kit: capacitors: 2 150pf disc capacitor [marked 150 or 151] (c1,c2) 5 .01µf disc capacitor [marked 103 , .01 or 1nf] (c3,c4,c5,c6,c7) 1 2.2µf electrolytic (c8) 1 4.7 to 10µf electrolytic capacitor (c9) 3 100-220µf electrolytic capacitor (c10,c11,c12) resistors...
Hr-80 • 8 "learn-as-you-build" 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. Since we are trying to keep assembly of the board simple, we will not be able to fully describe each individu...
Hr-80 • 9 parts layout:.
Hr-80 • 10 receiver assembly: 1) install the rca antenna jack, j1. Solder all four points. 2) install c5, a .01µf ceramic disc signal coupling capacitor. This capacitor brings the signal up to the front of the pc board. Notice the long pc trace from j1 through c5 to r1 3) install potentiometer r1, t...
Hr-80 • 11 positive lead into the ‘+’ marked hole on the pc board. 10) install c11, a 100-220µf electrolytic capacitor. Remember to observe correct polarity. C10 and c11 provide voltage stabilizing which directly improves the performance of the ne602 oscillator. 11) install c2, 150pf ceramic disc ca...
Hr-80 • 12 22) install the 9-volt battery snap connector, making sure that the red (+) and black (-) leads are correctly installed. 23) install c7, .01µf disc capacitor (marked 103 or .01 or 10nf). 24) install c8, a small 2.2µf electrolytic capacitor. Observe correct polarity. 25) install r6, 10k oh...
Hr-80 • 13 initial testing of your hr-80: you’re now ready to power up and test your hr-80, but before you begin take some time to sweep off your bench of any loose component leads or solder splashes. A clean work area not only makes testing less frustrating but also less prone to problems. Required...
Hr-80 • 14 hear a few whistles as you tune, the ne602 oscillator is working just fine. These simple initial checks verify that your receiver is operating well enough to proceed to the next section, alignment. Alignment: turn on whatever reference signal source you plan to use. This can be a regular ...
Hr-80 • 15 and l2 to get the exact tuning range you want. 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 sho...
Hr-80 • 16 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 wi...
Hr-80 • 17 replacement. Remember the ne602 circuits similar to ramseys generally call for sets of c or d cell batteries! For experienced builders more information regarding audio output is in the general notes. The simple design of the audio stage of the ramsey hr-80 receiver assumes preference for ...
Hr-80 • 18 you receiver on for a few days, just like we leave our computers and ham gear on all the time? (2) we thought you’d have more fun planning and installing your own lamp that glows in the dark! Troubleshooting tips: problem: all signals are chirpy and unstable. Solution: sorry to have to sa...
Hr-80 • 19 a careful check of all construction will solve your problem. Over 95% of the kits returned for repair have nothing more than a simple assembly or construction error! General notes for experienced qrp builders: we at ramsey electronics deliberately designed the hr-series of dc receivers to...
Hr-80 • 20 bandspread and tuning range: the easiest way to enjoy finer tuning , if you plan to use your receiver only for checking your favorite segment of the band, is to adjust the oscillator coil so that your desired segment falls within the second half of the rotation range of the tuning control...
Hr-80 • 21 value of c4. This will cause the varactor diode to have greater effect on the tuning. Try values of 33pf up to 100pf. Frequency stability: a kilohertz of drift is not a big deal in fm circuits or a shortwave broadcast configuration, but any frequency instability is annoying when trying to...
Hr-80 • 22 method is to wire a high-impedance counter probe line directly to pin 7 of the ne602, terminated to a rear panel frequency counter connection of your choice. This will consist of a short piece of mini- coax to a 1 megohm resistor bridged by a 27 to 33pf capacitor as shown below: with the ...
Hr-80 • 23 modification will achieve any particular ideal signal-to-noise ratio or audio frequency response, but is does significantly boost the output of the ne602 reaching the lm386 audio amplifier ic. Instead of the traditional transistor audio preamp circuit, an additional lm386 is used in its m...
Hr-80 • 24 construction notes:.
Hr-80 • 25 the ramsey kit warranty please read carefully before calling or writing in about your kit. Most problems can be solved without contacting the factory. Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All ramsey kits will work if assemble...
Hr-80 • 26 3. Factory repair of assembled kits: to qualify for ramsey electronics factory repair, kits must: 1. Not be assembled with acid core solder or flux. 2. Not be modified in any manner. 3. Be returned in fully-assembled form, not partially assembled. 4. Be accompanied by the proper repair fe...
Hr-80 • 27 hr-80 amateur receiver kit quick reference page guide introduction to the hr-80 ...............4 circuit description ...........................6 parts list ..........................................7 schematic diagram .........................9 parts layout .................................
