[Hammarlund] Hammarlund HQ-180 Clock

[D C _Mac_ Macdonald]

In all likelihood, the clock is a synchronous motor and has very little inductive reactance.  I suspect that measuring the DC resistance would get close enough to do the trick.

I really suspect that Andrea's HQ-180AC has a clock that was made for 220V/50Hz power.  She would probably have stated it if her clock was running too slowly.

 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk at hotmail.com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 
 
> From: s.dresser at verizon.net
> To: k2gkk at hotmail.com
> Subject: Re: [Hammarlund] Hammarlund HQ-180 Clock
> Date: Mon, 9 Sep 2013 17:21:25 -0400
> 
> If that motor runs on AC (and I think it does), your ohm meter won't tell 
> you anything useful because it's measuring DC resistance, not the inductive 
> load that the circuit is seeing. Btw, my vote is for the step-down 
> transformer.
> 
> Steve
> 
> ----- Original Message ----- 
> From: "D C _Mac_ Macdonald" <k2gkk at hotmail.com>
> To: <andreal1967 at gmail.com>
> Cc: "Hammarlund Mail List" <hammarlund at mailman.qth.net>
> Sent: Monday, September 09, 2013 12:06
> Subject: Re: [Hammarlund] Hammarlund HQ-180 Clock
> 
> 
> >I vote for the step-down transformer route, Andrea.
> > However, you can also try the following:
> > 1) Disconnect the receiver from power mains.
> > 2) Measure the resistance of the clock motor with an accurate digital 
> > ohmeter. You will need to disconnect one of the two wires to the clock for 
> > this measurement.
> > 3) Determine the power consumption of the motor using Ohm's law.
> > 4) Put a resistor of the same value and safe power rating (x 2) in series 
> > with the motor.
> > 5) Reconnect the receiver and check for operation.
> >
> > * * * * * * * * * * *
> > * 73 - Mac, K2GKK/5 *
> > * (Since 30 Nov 53) *
> > * k2gkk at hotmail.com *
> > * Oklahoma City, OK *
> > * USAF & FAA (Ret.) *
> > * * * * * * * * * * *
> >
> >
> >> Date: Mon, 9 Sep 2013 11:17:38 -0400
> >> From: wrcromwell at gmail.com
> >> To: hammarlund at mailman.qth.net
> >> Subject: Re: [Hammarlund] Hammarlund HQ-180 Clock
> >>
> >> On 09/09/2013 10:59 AM, Andrea Liverani wrote:
> >> > Hi, i am IW5CI, i like very much vintage radio and boatanchors made in 
> >> > the
> >> > USA.
> >> > In my collection i have some hammarlund gear like HQ-180AC, SP-600 
> >> > (JX-21)
> >> > a Superpro 400X and an HX-500 trasmitter. All the equipment is in good 
> >> > to
> >> > mint conditions and work great.
> >> >
> >> > When i purchased th HQ-180AC i noted that the clock motor was very hot
> >> > after some usage and i found that the receiver was configured for 220V 
> >> > AC
> >> > as is present in Italy, but i think the clock motor works at 110V AC.
> >> >
> >> > Has anyone an idea about the value of a suitable resistor to drop the
> >> > voltage from 220 to 110v?
> >> >
> >> Hi Andrea,
> >>
> >> How about a small transformer that will give you 110 - 120 volts AC from
> >> your 220 volts input? Those are available new for what I think are
> >> modest prices at several online "stores". That would be the most
> >> reliable and efficient way to deal with it.
> >>
> >> If you can find the current draw for the clock at 110 volts AC your
> >> resistor would have to drop the other 110 volts at whatever that is
> >> current. I wonder if one of the manuals gives that information. If you
> >> don't have the hard copy manuals you can probably find a copy at BAMA.
> >>
> >> Good luck and...
> >>
> >> 73,
> >>
> >> Bill KU8H