National HRO Instruction Manual Download Page 3 | Manualshive

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Summary of Contents for HRO

Page 1: ...UDSVRWGVRON MaDWaL for TEE Designed to meet the most ex acting demands of the more advanced communication service Price 10c...

Page 2: ...s design Only by a proper appreciation of some of the many unusual design features of this new re ceiver is it possible for the operator to secure the unusually high degree of per formance that we hav...

Page 3: ...post should be clamped under the GND terminal An external ground connection mav or mav not be neoessarv deoend Lng iupcm rht r i f l l r t T L ground id uiuaUy rlcsi ablesvilett receiviug r avcle grl...

Page 4: ...THE H R O RECEIVER...

Page 5: ...t inr t he audio gain control about halfway on and controlling the sensitivity with the R F gain control If the operator prefers a quiet receiver the audio control may be op erated at 1or 2 If AVC is...

Page 6: ...an inter fering station comes on the resulting heterodyne and interference may be eliminated by adiust ment of the phasing condenser T h s phasing adjustment is effectivein elunmnatinginterference reg...

Page 7: ...standard equipment other assemblies are available wv ering frequencies fmm 2 05 mcs to 50 kc and rsre listed on the back cover of this manual Alignment and Service Data THE four high frequency coil li...

Page 8: ...e adjusted I t should be pointed out here that adjustments forthegeneral coveragerangewilld e e t the hand spread range but the separate band spread ad justments may be made without changing the gener...

Page 9: ...ne certain pitch of the carrier whistle Detuning the receiver a small fraction of a degree while it changes the pitch only slightly vill make the signal much weaker since it has been detuned from the...

Page 10: ...quencies say from455 9 The five I F adjustments are indieatedon the k c to 456 1 k c It will he necessary therefore top view NOS 10to 14 inclusive to tune the signalso that the I F beat is isxactly Th...

Page 11: ...nsformers are tuned with air dielectric condensers the adjustments when once made are permanent and need only be checked when new tubes are substituted provided of course the receiver is not subjected...

Page 12: ...I THE HRQ RECUVER...

Page 13: ...tor 300 Meter Bfi Resistor 0 2 000 2nd R F G2Filter Resistor 500 000 S Meter Balancing Resistor 1 000 Heater Bj pass Condenser 1st I F nd F lterBy pass Cundenser 1st Det Cathode Bv rx se Condenser 2nd...

Page 14: ...ot only are precisely adjustable trimmer con densers required in all circuits but also some meansmust beemployedforobtaininginductance t trimming For instance it was found that the total length of wir...

Page 15: ...o the tuned b e eprimarieswith the correct amount of oapac circuit being interwound with it and having ity coupling To those who are not familiar with the same number of turns The grid winding this sy...

Page 16: ...rpose in that it also actsas an i f by pass condenser Frequency drift in the oscillator becomes an increas uglyditlicult problem to solve as the rangeofthe receiver is extendedtoward 10meters While va...

Page 17: ...he mmimum capacity of the tuning condenser and by so doing gives practically straight frequency line tuning on the band spreadrangesalso Mechanical Considerations Sofarwe hme discussedprincipally the...

Page 18: ...and 100 000microvolts HRO SPC I A complete self contained receiver is the unit pictured at the left It consists of a panel mounted HRO receiver an SPC unit and an MRR relay rack The SPC unit combines...

Page 19: ...00 K C List Price 27 50 F 500 1000 K C List Pnce 20 00 E 900 2050 K C List Price 20 00 MCS Table model metal cabinet and 8 P M Dynamic Speaker with 7000 ohm matching transformer List Price 16 50 RFSH...

Page 20: ...calibration The micq mder dial has an fed re scale length of tw 1 leet di ccl nadlng to one panln SOP Th alscnic lcharaor aina o11h samc high older aach 01 lh leu sections harlng lox lar Sl atila lelo...

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