¿ªÔÆÌåÓý?Don't confuse receivers intended to receive MF marine frequencies with those which could operate? from the mains current avaliable on ships,, namely 110 VDC.? Many receivers adapted to receive marine frequencies were also adapted for ship board power. There were several "marine" bands.? Most commonly used was the medium frequency band extending below the standard broadcast band.? It included the 500 Khz emergency frequency, a frequency for direction finding, non directional beacons and some other services.? Then there were several HF bands including allocations for radio- telephone.? There also special receivers meant to be part of communications rigs on larger vessels.? Usually, at least one covered the low frequency bands typically combined with the MF band with a second receiver covering MF anb HF, the overlap covering the international distress frequency allowing the two to back each other up. Receiversike the S-77 were meant for smaller ships and yachts. -------- Original message -------- From: don Root <drootofallevil@...> Date: 1/10/23 5:36 PM (GMT-08:00) Subject: Re: [HallicraftersRadios] S-40B - What is the socket on the back for? === end quote begin comment===== hi Richard again ,and others i don't understand your wording ... I can see that the S-40 [no B] has an octal socket? not a supply? to allow it to be connected to some? DC from somewhere, rather than AC I can also see the S-77A has an octal socket? for? asimilar purpose, and? voltages=? while the normal plug can work on AC or DC. ?if the octal socket scheme justifies "marine"? ok .. but .hold on... my Osterman's calls the s-51 [sea arer] a "marine band" receiver and then list band 1 as .132 to .405 Mcees--- looks like "marine" to me. The next listing is the S-52? also called "marine band" but bands are typical of most SW receivers, and don't look "marine" to me. halli listing in catalog?? says S-51 Marine Receiver Rugged and specially constructed for dependable sea or air use. Range 132 KC to 13 MC covers all impor- tant channels. Fixed frequency operation possible on three pre-tuned channels; facilitates switching fre- quency and/or standing guard. Built-in PM speaker. CONTROLS: Band Selector ¡ª 132-405 KC, 485-1530 KC, 1450-4550 KC, 4.2-13.0 MC, plus 3 fixed freq. posi- tions in 200-300 KC and 2-3 MC range; RF gain, Volu me, C W/A M, Range Filter, ANL, Tuning, 3 posi- tion Tone, C W Pitch, Rec./Standby. Gray steel cab- inet: 18 % by 9 by 9% in. deep; piano hinge top. Doublet or single wire antenna. Phone jack. Socket for 6, 12, or 32 v. vibrapack. 105-125 v. 50-60 cycle AC or DC. 9 TUBES PLUS RECTIFIER: 6SS7 RF Amp., 7A8 Cony., two 6SS7's IF Amps., 7C6 Det., 35L6 or 6V6 Output, 7A6 Noise Li miter, 6SS7 BFO, 35Z5 Rectifier. S-51. Ship. wt. 31 lbs Amateur Net $149.50 Vibrapack for 6, 12, or 32 v. operation |
