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====== Hammarlund SP-600-JX - Variants ======
Manufactured by [[Hammarlund Mfg. Co.]], New York NY.

The SP-600 was produced over several years in a big number of **variants**. For an overview of the variants, see the table in "Shortwave Receivers Past & Present" by Fred Osterman or the original version of the list compiled by Les Locklear at [[http://www.hammarlund.info|www.hammarlund.info]].

{{:images:hammarlund-sp600-front.jpg?direct&600|Hammarlund SP-600-JX}}
===== Technical data =====
  * [[Principle]]: [[Double conversion]] (above 7 MHz), [[IF]] (3955) / 455 kHz
  * [[Operation modes]]: [[A1]] with BFO, [[A3|AM (A3)]]
  * [[Frequency range]]: mostly 0.54 - 54 MHz
  * [[Frequency display]]: Analogue dial, 25  - 50 kHz
  * [[Frequency memory]]: none, some variants with six crystal controlled frequencies
  * [[Signal strength indicator]]: [[S-meter]]
  * [[Signal processing]]: [[RF gain]], crystal phasing - [[notch filter]]
  * [[Features]]: [[band spread]]
  * [[Sensitivity]]: [[A3|AM (A3)]] < 2 μV, CW < 0.75 μV / [[Selectivity]]: 0.2 / 0.5 / 1.3 (crystal)/ 3 / 8 / 13 kHz (-6 dB)

==== Power supply ====
  * [[Mains operation]]: 110, 220 V

==== Dimensions ====
  * Rack version: 480 x 266 x 440 mm, weight 30 kg

===== Variants SP-600 =====
On the nameplate, which can be found on the cover of the HF unit, a J means that components according to JAN (Joint Army Navy - Standard) are installed, an X that crystal controlled frequencies can be selected and an L that the set covers the long-wave range (used for aircraft beacons in the USA) instead of the full medium-wave coverage. 

{{tablelayout?colwidth="115px,140px,-,-,-,210px"}}
|SP-600-JX-1|frequency coverage 540 kHz - 54 MHz| |Army designation R-274A/FRR|component of the AN/MRR-4; GRC-38A & B systems| |
|SP-600-JLX-2|Frequency coverage 100-400 kHz & 1.35-29.7 MHz| | | | |
|SP-600-J-3|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies| | | |
|SP-600-J-4|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies, separately adjustable IF gain|Army designation R-320A/FRC|component of the OA-58B/FRC|{{:images-small:hammarlund-sp600-r320a.jpg?direct&200|}}|
|SP-600-J-5|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies, AC operation 25 - 60 Hz|Army designation R-483/FRR| | |
|SP-600-JX-6|Frequency coverage 540 kHz - 54 MHz|BFO range +/- 10 kHz|Navy designation R-274B/FRR|Component of AN/MRR-4; GRC-38A & B| |
|SP-600-JX-7|Frequency coverage 540 kHz - 54 MHz| | | | |
|SP-600-JX-8|Frequency coverage 540 kHz - 54 MHz| |produced for Welch Contract. XG-479| | |
|SP-600-JL-9|Frequency coverage 100-400 kHz & 1.35-29.7 MHz|no crystal controlled frequencies| | | |
|SP-600-JX-10|Frequency coverage 540 kHz - 54 MHz| |Successor model of the SP-600-JX-7| | |
|SP-600-J-11|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies|Successor model of the SP-600-J-3| | |
|SP-600-JX-12|Frequency coverage 540 kHz - 54 MHz| |Signal Corps designation R-274A/FRR|Successor model of the SP-600-JX-1|{{:images-small:hammarlund-sp600-r274a.jpg?direct&200|}}|
|SP-600-J-13|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies, AC operation 25 - 60 Hz|Successor model of the SP-600-J-5| | |
|SP-600-JX-14|Frequency coverage 540 kHz - 54 MHz| |Signal Corps designation R-274C/FRR (R-542/FRR)|Successor model of the SP-600-JX-10| |
|SP-600-JLX-15|Frequency coverage 100-400 kHz & 1.35-29.7 MHz| |Successor model of the SP-600-JLX-2| | |
|SP-600-JL-16|Frequency coverage 100-400 kHz & 1.35-29.7 MHz|no crystal controlled frequencies|Successor model of the SP-600-JL-9| | |
|SP-600-JX-17|Frequency coverage 540 kHz - 54 MHz|Diversity receiver, recognisable by two **<fc #ff0000>red buttons</fc>**|produced for the Air Material Command| |{{:images-small:hammarlund-sp600-jx21a.jpg?direct&200|}}|
|SP-600-JX-18|Frequency coverage 540 kHz - 54 MHz| |Produced for GAUVREAU Contract|Follow-up model of the SP-600-JX-10| |
|SP-600-J-19|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies, AC operation 25 - 60 Hz|Successor model of the SP-600-J-13| | |
|SP-600-J-20|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies, AC operation 25 - 60 Hz, 90 - 270 V|Signal Corps designation R-483A/FRR|Successor model of the SP-600-J-19|{{:images-small:hammarlund-sp600-r483a.jpg?direct&200|}}|
|SP-600-JX-21|Frequency coverage 540 kHz - 54 MHz| |Follow-up model of the SP-600-JX-10 & SP-600-JX-14| | |
|SP-600-J-22|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies|Follow-up model of the SP-600-J-11| | |
|SP-600-JLX-23|Frequency coverage 100-400 kHz & 1.35-29.7 MHz| |Successor model of the SP-600-JLX-15| | |
|SP-600-JL-24|Frequency coverage 100-400 kHz & 1.35-29.7 MHz|no crystal controlled frequencies|Successor model of the SP-600-JL-16| | |
|SP-600-J-25|Frequency coverage 540 kHz - 54 MHz|no crystal controlled frequencies, AC operation 25 - 60 Hz|Successor model of SP-600-J-19| | |
|SP-600-JX-26|Frequency coverage 540 kHz - 54 MHz| |Signal Corps designation R-274C/FRR|Successor model of SP-600-JX-14 & SP-600-JX-21| |
|SP-600-JLX-27|Frequency coverage 200-400 kHz & 540 kHz -29.7 MHz| | | | |
|SP-600-JX-28|Frequency coverage 540 kHz - 54 MHz| |Signal Corps designation R-620/FRR| | |
|SP-600-JX-29|Frequency coverage 540 kHz - 54 MHz| |for CIA, Contract No. XG-1178| | |
|SP-600-JX-30|Frequency coverage 540 kHz - 54 MHz|Diversity receiver, recognisable by two red buttons|Successor model of the SP-600-JX-17| | |
|SP-600-VLF-31|VLF frequencies 10 - 540 kHz|4 crystal controlled frequencies| | | |
|SP-600-JX-32|Frequency coverage 540 kHz - 54 MHz|black front panel with engraved designations| |produced for Mackay Radio, technically identical to SP-600-JX-21| |
|SP-600-JLX-33|Frequency coverage 100-400 kHz & 1.35 - 29.7 MHz| | | | |
|SP-600-JL-34|Frequency coverage 100 - 200 kHz, 540 KHz - 14.8 MHz| |for CIA, Contract No. XG-1765| | |
|SP-600-JX-35|Frequency coverage 540 kHz - 54 MHz|BFO range +/- 10 kHz|Signal Corps designation R-274B/FRR| | |
|SP-600-JX-36|Frequency coverage 540 kHz - 54 MHz|technically identical to SP-600-JX-21, additional audio input on the rear side|produced for FBI under No. FBI-16876| | |
|SP-600-JL-24 "Special"|Frequency coverage 100 - 200 kHz, 1.35 - 29.7 MHz| |US Navy designation R-274B/FRR| | |
|SP-600-JX-37|Frequency coverage 540 kHz - 54 MHz|AC operation 25 - 60 Hz|Successor model of the SP-600-JX-21| | |
|SP-600-VLF-38|VLF frequencies 10 - 540 kHz|4 crystal controlled frequencies, AC operation 25 - 60 Hz| | | |
|SP-600-JX-39|Frequency coverage 540 kHz - 54 MHz| |produced for FAA Contract FA-2338| | |
|SP-600-JX-21A|Frequency coverage 540 kHz - 54 MHz|latest variant of the SP-600 with product detector (LSB/USB/CW MOD switch)|front panel with engraved labelling & the designation JX-21A| |{{:images-small:hammarlund-sp600-jx21a.jpg?direct&200|}}|