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Many modern radios are made with SMD-components: they are not as resilient to environmental impacts (= salt water!) as the leaded components of my set. I cannot comment on the quality of other Ray Jefferson products, but my old radio has taken a terrible beating over the years - and keeps working. I cut my pack up, after making a gypsum mold, and used it to elongerate the pack with epoxy resin.
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But a bit of homework could alter the pack to accept the larger cells. It may be a bit difficult to find the right size, as the cells are only 3/4 of the length od an AA cell. If you want to give the battery pack a new lease of life, i assume you can replace the old Ni-Cad batteries with Ni-Mh cells. As far as i can determine, this transistor is already rather borderline for the rated max output power. IMHO, as long as it only receives, i guess it can run some time without damage - but if you start transmitting, the output transistor (Q213, 2SC3101) will overheat and suffer damage rapidly. In the 'specs' of the manual, the proper operating voltage is 8.2V plus/minus 10%. There is 7 NiCad batteries in the pack, that gives the final voltage of 8.2 volts. The charger voltage is 12V, so that the charging circuit (consisting of a couple of resistors and a diode) can loose some energy. Thanks again for helping out on this problem, I really appreciate it. If you want to contact the owner directly to see if he is willing to let it go for parts, he can be reached through me and I will forward messages to him for you. The owner of the radio is back in town now, so I will return the unit to him and forward your messages as well so that he can decide what to do with it. I only get one weather channel, but I am way beyond range of any small craft and the one weather channel is out of a town about 8 straight line miles from me. Hopefully, this wiring won’t hurt anything, as you state it is really 8.4 VDC, not 12 VDC as stated on the adaptor. The unit now works off of the adaptor from 110 volts as well as the 12 volt wires I installed. So far nothing bad has happened and it works, at least as far as the weather channel reception is concerned. I didn’t hear anything back from anyone saying not to do so and the charger adaptor is clearly marked 12 volts DC, so I removed the old, shot, batteries and wired it with alligator clips for 12 volt. If of little use for my friend due to possible frequency changes, Is it worth messing with and hooking it up to a 12 volt battery?ģ.
RAY JEFFERSON 5000M MOD
I can tell you that it is a Ray Jefferson Mod 789, Serial # 5823 and bears an FCC I. I have heard that most of this marine traffic has switched frequencies some time ago and maybe that is a problem as well.
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All I know is that I can get the squelch and I assume I could wire into the battery pack after removing the old and totally shot batteries so that it could be clipped to a 12 volt battery, but after that I wouldn’t know what to do with it. I didn’t have it on for long and am not really near that much boat traffic and don’t know the range on this unit anyway. The battery pack is shot and will not come to life with the charger, but it is 12 volt, so I hooked it up to a 12 volt car battery and was able to get squelch but no traffic. Frankly I don’t know squat about these things, but I tried to find something on the Internet about it with no success, so I assume the company is no longer in existence. He gave the Mod 789 to me to see if I could find out anything about it. A friend of mine recently bought a boat and with it was a Ray Jefferson Mod 789 Hand Held Marine Radio along with a base unit of more modern construction I assume.