Some real numbers. A 110W UHF repeater C74CXB7107BT with internal filter/duplexer, producing 60 watts into a dummy load at 122VAC input. RX squelched up, no other accessories, options, or fans.
RX: 0.61A, 60W, 74VA, PF=0.80 TX: 4.00A, 452W, 487VA, PF=0.92 60 RF output watts at the duplex antenna connector for 480 AC input watts is a whopping 12.5% efficiency. I think the 8A rating would be adequate if the station had more options and fans. Measurements made with a "Kill-A-Watt" device. The 6A value quoted below was measured with a different meter which was obvioiusly in error. Bob M. ====== --- Andrew <[EMAIL PROTECTED]> wrote: > Thanks for all the replys and I'll make sure I have > the correct power > cord. > > Andrew > > --- In [email protected], Mike Morris > WA6ILQ > <[EMAIL PROTECTED]> wrote: > > > > And while the MSFs have an IEC power connector > > DO NOT use a wimpy computer power cord. > > Go to an industrial supplier and get a good husky > > IEC power cord ( #8 wire if you can get it, #10 if > > you can't, or #12 if it's a really short run). > > > > I've seen a couple of MSFs where the owner > obviously > > could not locate a IEC cord with husky enough wire > to > > satisfy him (not everyone has access to big-city > > electrical supply houses). > > On those two units the IEC was removed and > replaced > > with a cut down piece of steel plate that looked > almost > > like a piece of an outlet box blank cover plate . > A three > > foot piece of three conductor #8 or #10 cable hung > out > > of a grommet with a 3 conductor twist lock plug on > the > > end. > > > > Mike WA6ILQ > > > > At 05:52 PM 11/13/07, you wrote: > > >That's a pretty good number. They use > ferro-resonant > > >power supplies which are notoriously inefficient. > My > > >75w UHF station draws about 6 amps when > transmitting. > > >The 110w supply is rated for 625 watts output, so > > >figure at best about 70% efficiency and you're up > near > > >900 watts AC input. > > > > > >If you need an exact value, I can fire up a > station > > >and measure it. > > > > > >Best place for one of these stations is at a site > > >where YOU do NOT have to pay for the electricity > ! > > > > > >Bob M. > > >====== > > >--- Andrew <[EMAIL PROTECTED]> wrote: > > > > > > > Hi, > > > > Does anyone happen to know the current draw on > > > > transmit of a 100W UHF > > > > Moto MSF5000. > > > > The VA rating on the sticker calculates out to > > > > around 8A. I just want > > > > to be sure before I go plugging it in and > tripping a > > > > circuit. > > > > > > > > Thanks > > > > Andrew > > > > KC2EUS / GM1YMI ____________________________________________________________________________________ Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. http://overview.mail.yahoo.com/
