[Amps] Price per Watt Conversation

[Roger (K8RI)]

Thanks Ian!

73, Roger (K8RI)

On 4/26/2017 3:38 AM, Ian White wrote:
> K8RI wrote:
>
>> 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.
> The main problem with the Quadra PS is its tendency to blow the
> step-start resistors (R2A, B, C) that limit the startup surge current.
> This is caused by two design errors, both of which can easily be
> rectified at repair time.
>
> 1. Step-start resistors are overloaded by design, but the cement-cased
> resistors that Yaesu selected are quite poor at handling surges! If they
> fail, replace all three with glass-coated resistors with better
> surge/overload characteristics.
>
> 2. If the step-start relay fails to activate for some other, unrelated
> reason, then the step-start resistors *will* blow because they have no
> other protection. Following an idea from Alpha, insert a time-delay fuse
> that is rated to blow in several seconds. (This idea will not work with
> the existing Yaesu resistors... guess why.)
>
> 73 from Ian GM3SEK
>
>
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