SP-600 DESIGNATION'S
PRODUCTION SUFFIX # NOTES
DATE
Sept. 1951 SP-600-JX-1 Std. frequency range 540 Khz - 54 Mhz.
Also designated R-274A/FRR (family of
Radios) Signal Corps order no.
1689-Phila-51-01.
Sept. 1951 SP-600-JLX-2 Std. frequency range 100 - 400 Khz,
1.35 - 29.7 Mhz.
Sept. 1951 SP-600-J-3 Std. frequency range, 540 Khz - 54
Mhz. No Xtal frequency control.
Sept. 1951 SP-600-JX-4 Std. frequency range 540 Khz - 54
Mhz. No Xtal frequency control. Signal
Corps. R-320A/FRR. Order no.
19474-Phila-50-06. Also has separate
IF gain control.
Nov. 1951 SP-600-J-5 Std. frequency range, 540 Khz - 54Mhz.
equipped with 25 cycle(hertz) power
supply. Signal Corps. R-483/FRR.
Order no. 21478-Phila-50.
Sept. 1951 SP-600-JX-6 Std. frequency range, 540Khz - 54Mhz.
BFO range 0-10Khz. U.S. Navy model
R-274B/FRR. Order no. Nobsr-52039.
Sept. 1951 SP-600-JX-7 Std. frequency range. 540Khz - 54 Mhz.
Sept. 1951 SP-600-JX-8 Std. frequency range .540Khz - 54Mhz.
Manufactured for Welch contract no.
-XG-479.
Sept. 1951 SP-600-JL-9 Std. frequency range, 100 - 400Khz,
1.35 - 29.7Mhz. No Xtal frequency
control.
Sept. 1951 SP-600-JX-10 Std. frequency range, 540Khz -
54Mhz. Replaces JX-7.
Nov. 1951 SP-600-J-11 Std. frequency range 540Khz - 54Mhz.
No Xtal frequency control. Note: This
model made to complete NAVY order,
without the changes per ECN1156 as
standard J series. Replaces J-3.
Nov. 9, 1951 SP-600-JX-12 Std. frequency range, 540Khz -
54Mhz. Signal Corps. R274A/FRR,
order no. 3376-Phila-52. Replace JX-1.
Nov. 26, 1951 SP-600-J-13 Std. frequency range, 540Khz -
54Mhz. No Xtal frequency control.
Signal Corps. order no. 16838-Phila-
51. Serial no's 52 - 67 inclusive. 25
cycle power supply. Replaces J-5.
April 23, 1952 SP-600-JX-14 Std. frequency range, 540Khz -
54Mhz. Signal Corps. R274C/FRR,
order no. 3376-Phila-52. Replaces
J-10.
June 17, 1952 SP-600-JLX-15 Std. frequency range, 100 - 400Khz,
1.35 - 29.7Mhz. Replace JLX-2.
June 17, 1952 SP-600-JL-16 Std frequency range, 100 - 400Khz,
1.35 - 29.7Mhz. No Xtal frequency
control. Replaces JL-9.
June 17, 1952 SP-600-JX-17 Std. frequency range, 540Khz -
54Mhz. Diversity receiver
manufactured for Air Material
Command. Note: easily identified by
" Red Knobs."
June 26, 1952 SP-600-JX-18 Std. frequency range, 540Khz -
54Mhz. Made for "GAUVREAU"
contract. Replaces JX-10.
Aug. 27, 1952 SP-600-J-19 Std. frequency range, 540Khz -
54Mhz. No Xtal frequency control.
Equipped with 25 cycle power supply.
Replaces J-5, J-13.
Aug. 1952 SP-600-JX-20 Std. frequency range, 540Khz -
54Mhz. No Xtal frequency control.
Same as J-19. Signal Corps.
R483A/FRR, order no. 3479-Phila-52.
Equipped with 25 cycle power supply.
Replaces J-19.
Feb. 13, 1953 SP-600-JX-21 Std. frequency range, 540Khz -
54Mhz. Replaces JX-10.
Feb. 1953 SP-600-J-22 Std. frequency range, 540Khz -
54Mhz. No Xtal frequency control.
Replaces J-11.
Feb. 1953 SP-600-JLX-23 Std. frequency range, 100 - 400Khz,
1.35 - 29.7Mhz. Replaces JLX-15.
Feb. 1953 SP-600-JL-24 Std. frequency range, 100 - 400Khz,
1.35 - 29.7Mhz. No Xtal frequency
control. Replaces JL-19.
Feb. 1953 SP-600-J-25 Std. frequency range, 540Khz -
54Mhz. Equipped with 25 cycle
power supply. Replaces J-19.
CONTINUE