![]() I can tell you that it is a Ray Jefferson Mod 789, Serial # 5823 and bears an FCC I. 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. 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. So far nothing bad has happened and it works, at least as far as the weather channel reception is concerned. The unit now works off of the adaptor from 110 volts as well as the 12 volt wires I installed. Hopefully, this wiring won’t hurt anything, as you state it is really 8.4 VDC, not 12 VDC as stated on the adaptor. 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. 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. 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. Thanks again for helping out on this problem, I really appreciate it. The charger voltage is 12V, so that the charging circuit (consisting of a couple of resistors and a diode) can loose some energy. There is 7 NiCad batteries in the pack, that gives the final voltage of 8.2 volts. In the 'specs' of the manual, the proper operating voltage is 8.2V plus/minus 10%. ![]() 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. As far as i can determine, this transistor is already rather borderline for the rated max output power. 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. ![]() 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. I cut my pack up, after making a gypsum mold, and used it to elongerate the pack with epoxy resin.īut a bit of homework could alter the pack to accept the larger cells. 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. 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. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
March 2023
Categories |