Re: [Elecraft] 48V, plus or minus, usually
In a message dated 08/01/05 14:45:58 GMT Standard Time, [EMAIL PROTECTED] writes: >> It's that 50 volt 20 amp supply >> that's a killer! Actually, this voltage/current is very easy to come by, and relatively low in cost. The telephone industry uses this voltage and at high currents. -- The only point to be careful of is that yes, telecoms do use 48V though with +ve ground. You have to ensure that the supply is not tied to ground inside the PSU. That said there are plenty of suitable 115AC to 48V PSU (mainly switched mode) used with PABX systems that should be available on the surplus market as there has been a large turn over of the older analog telephone switches for the digital type. Bob, G3VVT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] 48V, plus or minus, usually
>> It's that 50 volt 20 amp supply >> that's a killer! Actually, this voltage/current is very easy to come by, and relatively low in cost. The telephone industry uses this voltage and at high currents. Surplus is readily available, and often at prices less than the per-watt cost of a 13.8V high current supply. KS4VA often has such supplies at his commercial website www.valuesurplus.com ... he also sells new 1/2" Andrew hardline for 75 cents a foot!! (That's how I have an all-hardline feedline system installed here.) I have no commercial interest except to see a fellow ham with great deals do well! ;-) __ Do you Yahoo!? Yahoo! Mail - You care about security. So do we. http://promotions.yahoo.com/new_mail ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
