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Hammarlund Mfg. Co., New York / Mars Hill NC

SP - 600 - JX / Super Pro SP-600: Variants

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überarbeitet am 14.11.2010

Double conversion (above 7 MHz), I.F. (3955) / 455 kHz

Analog dial, bandspread dial witch mechanically coupled log dial

AM, CW with BFO

Sensitivity < 0,75 uV CW, < 2 uV AM

Selectivity (- 6 dB)
0,2 / 0,5 / 1,3 (crystal)/ 3 / 8 / 13 kHz

RF gain, bandspread dial, crystal phasing / notch filter

The SP-600 has been produced in very many variants over the years. An eccellent review of all types is found in the book "Shortwave Receivers Past & Present" by Fred Osterman the original version of Les Locklear's listing underwww.hammarlund.info.

The typeplate is usually found on the cover of the r.f. unit: J- will say that all components meet the JAN (Joint Army Navy) Standard requirements, a X that the receiver is equipped with an oscillator for crystal controlled fixed frequency operation, and a L, that the set covers not the mediumwave band but the longwaves, used in the United States for aeronautical beacons (NDB).

SP-600-JX-1 Frequency range 540 kHz - 54 MHz,
Army designation R-274A/FRR
Part of sets AN/MRR-4; GRC-38A & B
SP-600-JLX-2 Frequency range 100-400 kHz & 1.35-29,7 MHz
SP-600-J-3 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation
SP-600-J-4 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation, separate i.f. amplification control
Army designation R-320A/FRC
part of set OA-58B/FRC
R-320A
SP-600-J-5 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation, powered AC 25 - 60 Hz
Army designation R-483/FRR
SP-600-JX-6 Frequency range 540 kHz - 54 MHz,
BFO-Bereich +/- 10 kHz
Navy designation R-274B/FRR
Part of sets AN/MRR-4; GRC-38A & B
SP-600-JX-7 Frequency range 540 kHz - 54 MHz
SP-600-JX-8 Frequency range 540 kHz - 54 MHz,
produced for Welch Contract. XG-479
SP-600-JL-9 Frequency range 100-400 kHz & 1.35-29,7 MHz
no crystal controlled fixed frequency operation
SP-600-JX-10 Frequency range 540 kHz - 54 MHz
Successor of the SP-600-JX-7
SP-600-J-11 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation,
Successor of the SP-600-J-3
SP-600-JX-12 Frequency range 540 kHz - 54 MHz,
Signal Corps designation R-274A/FRR
Successor of the SP-600-JX-1
R-274A
SP-600-J-13 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation, powered AC 25 - 60 Hz
Successor of the SP-600-J-5
SP-600-JX-14 Frequency range 540 kHz - 54 MHz
Signal Corps Bezeichnung R-274C/FRR (R-542/FRR)
Successor of the SP-600-JX-10
SP-600-JLX-15 Frequency range 100-400 kHz & 1.35-29,7 MHz
Successor of the SP-600-JLX-2
SP-600-JL-16 Frequency range 100-400 kHz & 1.35-29,7 MHz
no crystal controlled fixed frequency operation
Successor of the SP-600-JL-9
SP-600-JX-17 Frequency range 540 kHz - 54 MHz
Diversity receiver, can be identified by the two red knobs,
produziert for the Air Material Command
SP-600-JX-17
SP-600-JX-18 Frequency range 540 kHz - 54 MHz
Produced for GAUVREAU Contract.
Successor of the SP-600-JX-10
SP-600-J-19 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation, powered AC 25 - 60 Hz
Successor of the SP-600-J-13
SP-600-J-20 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation, powered AC 25 - 60 Hz, 90 - 270 V
Signal Corps designation R-483A/FRR
Successor of the SP-600-J-19
R-483A
SP-600-JX-21 Frequency range 540 kHz - 54 MHz
Successor of the SP-600-JX-10 & SP-600-JX-14
SP-600-J-22 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation,
Successor of the SP-600-J-11
SP-600-JLX-23 Frequency range 100-400 kHz & 1.35-29,7 MHz
Successor of the SP-600-JLX-15
SP-600-JL-24 Frequency range 100-400 kHz & 1.35-29,7 MHz
no crystal controlled fixed frequency operation
Successor of the SP-600-JL-16
SP-600-J-25 Frequency range 540 kHz - 54 MHz,
no crystal controlled fixed frequency operation, powered AC 25 - 60 Hz
Successor of the SP-600-J-19
SP-600-JX-26 Frequency range 540 kHz - 54 MHz
Signal Corps Bezeichnung R-274C/FRR
Successor of the SP-600-JX-14 & SP-600-JX-21
SP-600-JLX-27 Frequency range 200-400 kHz & 540 kHz - 29,7 MHz
SP-600-JX-28 Frequency range 540 kHz - 54 MHz
Signal Corps designation R-620/FRR
SP-600-JX-29 Frequency range 540 kHz - 54 MHz
produced for CIA, Contract No. XG-1178
SP-600-JX-30 Frequency range 540 kHz - 54 MHz
Diversity Empfänger, can be recognized by the two red knobs,
Successor of the SP-600-JX-17
SP-600-VLF-31 VLF frequencies 10 - 540 kHz
4 crystal controlled fixed frequencies
SP-600-JX-32 Frequency range 540 kHz - 54 MHz
black frontpanel with engraved lettering
produced for Mackay Radio, technically identical to the SP-600-JX-21
SP-600-JLX-33 Frequency range 100-400 kHz & 1,35 - 29,7 MHz
SP-600-JL-34 Frequency range 100 - 200 kHz, 540 KHz - 14,8 MHz
for CIA, Contract No. XG-1765
SP-600-JX-35 Frequency range 540 kHz - 54 MHz
BFO-Bereich +/- 10 kHz
Signal Corps designation R-274B/FRR
SP-600-JX-36 Frequency range 540 kHz - 54 MHz
technically identical to the SP-600-JX-21, additional audio input at the rear
produced for the FBI under contract No. FBI-16876
SP-600-JL-24 "Special" Frequency range 100 - 200 kHz, 1,35 - 29,7 MHz
US Navy designation R-274B/FRR
SP-600-JX-37 Frequency range 540 kHz - 54 MHz
powered AC 25 - 60 Hz
Successor of the SP-600-JX-21
SP-600-VLF-38 VLF frequencies 10 - 540 kHz
4 crystal controlled fixed frequencies
powered AC 25 - 60 Hz
SP-600-JX-39 Frequency range 540 kHz - 54 MHz
produced for FAA Contract FA-2338
SP-600-JX-21A Frequency range 540 kHz - 54 MHz
Latest variant of the SP-600 with product detector (LSB/USB/CW MOD switch)
Frontpanel with engraved lettering and designation JX-21A
SP-600-JX-21A

© Martin Bösch 1.5.2008