The "modern, power-saving" wall-warts contain a small, switching (and noisy)
power supply. The "old" once only contain a (high loss) transformer, diodes and
(sometimes) a capacitor. By-the-way, those rectifier diodes does generate some
noise too.
You can easy distinguish the two by plugging them in. The old once get
noticeable warmer.
Hans - N2JFS
-----Original Message-----
From: Jim W7RY <w7ry@inbox.com>
To: K8RI on TT <k8ri-on-towertalk@tm.net>; towertalk <towertalk@contesting.com>
Sent: Sun, Apr 17, 2011 9:10 pm
Subject: Re: [TowerTalk] >>Ameritron RCS-4 remote switch
Pretty hard to get noise from a AC wall wart. It's only a transformer. That's
it! If it was a DC switching wart, then you would have a point.
73
Jim W7RY
--------------------------------------------------
From: "K8RI on TT" <k8ri-on-towertalk@tm.net>
Sent: Sunday, April 17, 2011 3:34 PM
To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] >>Ameritron RCS-4 remote switch
> On 4/16/2011 5:23 PM, Mark n2qt wrote:
>> the MFJ RCS4 needs AC voltage for it to work right. You can't wire it
>> into
>> the
>> station 12 volt supply and get it to work.. (well you would be able to
>> get two of the 4 specified switched connections, but that would probably
>> leave
>
> Then how about tapping off the 12V AC.
> There is nothing special about wall warts, except they often make RFI,
> and they charge for them when generally we have a better source handy.
> OTOH there are such things as small battery chargers that need current
> limiting but that is typically done int he charger, and not the wall wart.
>
> 73
>
> Roger (K8RI)
>
>
>
>> you unhappy).
>>
>> Mark n2qt
>>
>>
>>
>> -----Original Message-----
>> From: K8RI on TT
>> Sent: Saturday, April 16, 2011 5:09 PM
>> To: towertalk@contesting.com
>> Subject: Re: [TowerTalk]>>Ameritron RCS-4 remote switch
>>
>> On 4/16/2011 3:55 PM, Jon Casamajor wrote:
>>> Tony,
>>> I have used this switch since 1988 on my tower with various antennae. I
>>> have had a couple of problems and learned a few lessons. First, I have
>>> elected to mount the relay box at ground level so that if something goes
>>> wrong I don't have to crank down the who tower to trouble shoot. Not a
>>> big
>>> deal when I was younger but a big deal as I age.
>>> I have two systems. One has the power supply built into the station
>>> console.
>>> This was my original and still is in service today. The second one made
>>> by
>>> MFJ has an external wall wart. Just a few weeks ago the wall wart
>>> failed
>>> and took out the RF Choke while it was at it. Parts were $12, fix was
>>> easy.
>>> That is why I have two. BTW, the wall wart is 12V AC @1A, not DC so you
>>> can
>>> have trouble finding one rated for the 1A current.
>>>
>> If the "wall wart" is of standard voltage why both even using it. I
>> wire mine right into the DC supply.
>> I do use the remote switches with wired control rather than the ones
>> that use the coax and decoding. It's just a matter of preference but I
>> see the decoder as just one more thing to fail. Likewise I mount the
>> remote switches near the bottom of the tower... Just out of reach so it
>> takes a step ladder or about a 5' climb. (just as a deterent)
>>
>> 73
>>
>> Roger (K8RI)
>>
>>> Based on my rather lengthy experience, I think it is a good value and
>>> saves
>>> running yet another darn cable to the tower
>>>
>>> 73, Jon
>>> K6EL
>>> -----Original Message-----
>>>
>>>> All,
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1321 / Virus Database: 1500/3579 - Release Date: 04/17/11
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|