Since the primary current is half and the number of turns are two times, the
resistance could be four times for 220v vs. 110vac.
Perhaps your original 6 ohm reading is right on the money.
73,
Gerald K5GW
In a message dated 5/8/2006 3:26:07 P.M. Central Daylight Time,
garyschafer@comcast.net writes:
Thanks Dan,
I have a VS35M also and it shows a resistance of around an ohm on my Fluke
77 meter so that sounds in the ball park. I wasn't sure if the transformer
in the 20 amp supply would be a lot higher than the 35 amp supply or not but
it sounds like it is about the same.
Now if I can find someone that has a 220 volt unit to make a comparison I
will be all set. It should be about twice that or around 2.2 ohms or so but
I read around 6 ohms on the one in question.
By the way Astron does not (at least in the past) use dual primary
transformers. It is either 120 or 220.
Thanks
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Dan Hearn
> Sent: Monday, May 08, 2006 2:53 PM
> To: garyschafer@comcast.net; amps@contesting.com
> Subject: Re: [Amps] Astron RS20A primary resistance
>
> Gary, I have a VS20M Astron here which I suspect has the same xfmr in it.
> I
> measure the primary R as 1 ohm with my Tripplet 60NA. That seems awfully
> low
> so I measured it with my Fluke 77 and get 1.1 ohms. I measured between the
> blades on the line cord with the power switch on. Still seems pretty low
> but
> I believe my measurements. 73, Dan, N5AR
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
> Behalf Of Gary Schafer
> Sent: Sunday, May 07, 2006 7:59 PM
> To: amps@contesting.com
> Subject: [Amps] Astron RS20A primary resistance
>
>
> I need to know what the primary resistance is of the Astron RS20A
> transformer. I would like to know the resistance of a 220 volt transformer
> and a 120 volt transformer.
>
> Maybe someone has a 220 volt RS20A that could measure the resistance
> across
> the power plug, that will do it.
>
>
>
> I have a power supply here that is supposed to be a 120 volt unit but it
> looks like it has a 220 volt transformer as I only get around ½ the
> voltage
> out on 120. This transformer measures around 6 ohms primary resistance.
>
>
>
> Thanks for any help.
>
>
>
> 73
>
> Gary K4FMX
>
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