HF Diversity Receiver Systems |
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| model | type | primary use | freq | features | manuf | links |
| AN/FRR-10 | Dual Diversity HF shore SSB (simultaneous USB & LSB) variant of FRR-24 |
2-32 mc | dual diversity
253 tubes |
National | ||
| AN/FRR-24 | Triple Diversity HF shore RTTY & CW |
2-32 mc | triple diversity
420 tubes |
National | ||
| AN/FRR-28 | ![]() two R-450/FRR-28 rcvrs O-165/UR master oscillator AM-615/UR amplifier/detector KY-79/UR keyer SB-224/UR patching panel LS-187/UR speaker |
R-450/FRR-28 showing AVC switch and ID tags |
0.54-54 mc
Dual Diversity used with AN/URA-8A |
uses two Hammarlund SP-600-MX (R-450/FRR-28) |
manuf - Northern Radio |
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| AN/FRR-32 | Dual Diversity -
HF shore system 2-32mc |
two R-618/FRR-32 rcvrs (probably modified FRR-23) O-330/FRR-32 master xtal oscillator CM-70/FRR-32 comparator/keyer SB-431/FRR-32 patching panel LS-169/G speaker CY-597A/G rack
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RCA | NAVSHIPS 92736 | ||
| AN/FRR-37 | Dual Diversity version of FRR-24 HF shore RTTY & CW |
2-32 mc | dual diversity approx 250 tubes |
National | ||
| AN/FRR-38 | Dual Diversity FSK two R-390(*) receivers CV-116/URR dual FSK converter |
0.5-32 mc | Signal Corps procurement but used by USN | Collins Hoffman |
TM-11-647 TO: 31R2-2FRR38, 31R-1-8 |
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| AN/FRR-41 | Dual diversity SSB two R-390(*) receivers two CV-157 SSB converters (simultaneous USB & LSB from each) |
0.5-32 mc | Signal Corps procurement but used by USN | Collins others |
TM 11-649 TO: 31R2-2FRR-221 |
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| AN/FRR-42 AN/FRR-43 |
Similar to AN/FRR-24 | Click Here for Info | ||||
| AN/FRR-51 | need photo | Dual-diversity HF with 10 channel auto-tune
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need info | need info - please send e-mail | ||
| AN/FRR-60 | ![]() photo from TMC vintage radio web site |
HF shore diversity system
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info needed | Info - AN/FRR-60 Page | TMC DDR-5 |
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| AN/URR-49 | ![]() Guam 1968 - URR-49 configurations |
HF shipboard/shore FSK dual-diversity system
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info needed | Nomenclature was assigned and configuration was widely used, but I'm not sure it was ever procured as URR-49 | ||
| REA part of AN/FRC-10 |
photo | Western Electric triple diversity for pt.-to-pt.
VF AFSK links 4-23 mc dual channel SSB (crystal controlled?) |
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