Most manufacturers, size the transformer to what the amp does. It's according
to what the amp is made for SSB only or AM/SSB. If for SSB only, you'll find
the transformer to be maybe 25% smaller than one for dual duty. SSB does not
put a continuous draw of current on the line the same as AM does over the
carrier. Even though you have the same peak power with both, the duty cycle is
less for SSB.
Best,
Will
*********** REPLY SEPARATOR ***********
On 10/2/05 at 4:48 PM Bill Coleman N2BC wrote:
>I don't understand why the power load difference between AM or SSB...
>Legal limit on AM is 375W carrier, at 100% modulation you get 1500W. In
>terms of peak power 1500W AM = 1500W SSB. Now... if that's not what your
>doing the equation changes.
>
>Bill N2BC
>----- Original Message -----
>From: "Will Matney" <craxd1@verizon.net>
>To: <amps@contesting.com>
>Sent: Sunday, October 02, 2005 3:50 PM
>Subject: Re: [Amps] Power cord to use when converting AL-80B to 240 volts?
>
>
>> Mike,
>>
>> That was one of the reasons I used them plus they were cheaper than
>going
>> and buying a piece of SO cord and a plug. They make some smaller for
>large
>> window air conditioners running on 220 Vac too. However, I just went and
>> looked at my dryer cord and it couldn't be over 14 gage, maybe 12 at the
>> most as it's only about 1" wide if that. One of those same flat grey
>> cables. It did use a 3/4" conduit clamp instead of a 1/2" though. If I
>> recall, most range cords are smaller than a dryer cord, and the circuit
>> doesn't require as large of a breaker, I may be wrong. I imagine why the
>> cords are as cheap as they are is where their mass produced. You can
>find
>> them cheaper at the surplus houses like H&R. I bought mine at a supplier
>> who specializes in HVAC, and appliance parts named M&R Supply in
>> Huntington, WV. Of course I had a discount there at the time where I was
>a
>> business. Lowes and Home Depot has them about as cheap.
>>
>> On AM/SSB amps, it takes more as not only do you have those power peaks
>> but you have a carrier that has to be supported. Most amps are made for
>> both so you have to size everything around that usage unless you'll
>never
>> operate it on AM.
>>
>> Best,
>>
>> Will
>>
>> *********** REPLY SEPARATOR ***********
>>
>> On 10/2/05 at 3:13 PM m.ford wrote:
>>
>>>----- Original Message -----
>>>From: "Neal Sacon" <neal@sacon.net>
>>>To: <AMPS@contesting.com>
>>>Sent: Sunday, October 02, 2005 2:09 PM
>>>Subject: [Amps] Power cord to use when converting AL-80B to 240 volts?
>>>
>>>
>>>> You're probably thinking about range and dryer cords and plugs as
>>>examples
>>>> of "actual 240 v. power cord" but you really don't need range or dryer
>>>cord,
>>>> plugs or receptacles for your application - you're not pulling nearly
>>>> enough current to justify wire gauges that heavy and all you'd end up
>>>with
>>>> are cumbersome cables and bulky plugs with a lot of unused capacity.
>>>Dryers
>>>> and ranges need at least 50 amps at 240 volts; your amp needs 10 amps
>at
>>>240
>>>> volts.
>>>
>>>Dryers and ranges are resistive loads (cept the dryer motor) and do not
>>>produce voice modulated current peaks that like to see very low mains
>>>resistance. Nice cheap upgrade for any amp.
>>>
>>>Mike k1ern
>>>
>>>>
>>>>
>>>>
>>>> So, I'm not sure why you wouldn't leave the cord and just replace the
>>>120VAC
>>>> plug supplied with a 240 v. (e.g., one that looks like a "regular" plug
>>>> except that the flat pins are perpendicular to each other instead of
>>>> parallel) after you change the jumpers and fuses.
>>>>
>>>>
>>>>
>>>> 73 Neal N7RX
>>>>
>>>> _______________________________________________
>>>
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>>>Amps mailing list
>>>Amps@contesting.com
>>>http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>> _______________________________________________
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>>
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