[Amps] Price per Watt Conversation

[Thomas Walsh]

It all depends on the transformer specs., a good example is the 
yaesu FL-7000 which has a transformer designed for 220vac on
the primary. Most have 240v service today (ours is consistently 248)
 so if they run it say at 240v the transformer will eventually cook. This is why that N4 guy who fixes FL7000 insists on wiring it to 120, to save the transformer. I would just run a large variac down to 220 and end up with even more headroom..So its just a matter of knowing if your transformer is for 220 pri or not is all.


Sent from my iPad

> On Apr 25, 2017, at 11:49, David Gow <d.gow at frontier.com> wrote:
> 
> The manual also states that the higher end of the 200-240 range is preferred
> because it helps to overcome line losses.
> 
> Dave W7VM
> 
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Richard Solomon
> Sent: Tuesday, April 25, 2017 9:44 AM
> To: Amplifiers
> Subject: Re: [Amps] Price per Watt Conversation
> 
> The 220 vac number comes from the
> power output spec that says 1,000
> Watts out @ 220 vac. But the manual
> clearly states 100 - 240 vac input.
> 
> 73, Dick, W1KSZ
> 
>> On Tue, Apr 25, 2017 at 9:16 AM, Doug Renwick <ve5ra at sasktel.net> wrote:
>> 
>> Roger,
>> The specifications for my Yaesu VP-1000 (Quadra) power supply state 
>> the input voltage is AC 100-240 V~, 50-60 Hz. This is different from 
>> the 220 V you mention. I can scan the spec sheet for further proof if 
>> you are still a doubter.
>> 
>> Doug
>> 
>> "Political correctness is a weapon used to silence people who tell the 
>> truth" - Ayaan Hirsi Ali
>> 
>> -----Original Message-----
>> 
>> Efficiency is not high on my priority list "as long as the heat 
>> generated is easy to manage" and ceased to be a concern when the legal 
>> limit went to output instead of input..  OTOH predistortion, or 
>> Adaptive predistortion would appear to allow both efficiency and quality.
>> 
>> At close to 200W per device, it would require 8 devices in a circuit 
>> much like the Yaesu Quadra, but with a legal limit out for less money.
>> BTW I saw several posts praising the Quadra, but the Quadra has 
>> several inherent problems in the basic design according to the Yaesu 
>> news groups..  One is the PS is designed for 220 VAC and not the 
>> current standard of 240 leading to a number of failures. Another is 
>> the way the power supplies feed the individual amps. OTOH it is a nice 
>> amp and I do see a number of hams claiming to be running 1200W out for 
>> many years.  I have two.
>> 
>> 73, Roger (K8RI)
>> 
>> 
>> 
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