Hello.
For what is worth, I’m using an IOTA-90 without issues daily.
Fernando N2FQ/6
n2fq@sbcglobal.net
> On May 10, 2017, at 10:06 AM, Katz Ajamas <ajamas.rn@gmail.com> wrote:
>
> I am using a battery at present. It works well but but I do not charge
> indoors and with an expectation of increased operating time, charging is
> going to be a hassle. Also, once past 20% discharge, it's no better than
> the SMPS I have.
>
> The 2SC2879 transistors are supposed to run at 12.5V for best intermod
> specs. The HP SMPS supply I have now barely makes 12.3V. There is a good
> bit of drop in the stock Tentec cable and some more with the inner
> connections.. The connector appears to be rated for the current. Bottom
> line, the devices are running at about 11.6V for 500W output.
>
> I'd like to find a matching Tentec supply for a reasonable (caps likely
> need to be replaced) price.
>
> Looking around at other options, there is a "Meanwell" brand SMPS at Mouser
> and Arrow that makes 13.5V-16V adjustable, has voltage sense lines that can
> be wired to the collectors, and can be turned on and off with a TTL signal.
> It is class B EMI rated.
>
> In trying to get a handle on the class B spec, I find a radio station on
> 1.5MHz and has a 400uV/m contour at my location is S7. Alas, the class B
> spec is for a conducted "limit" and does not make sense at 250uV as this
> will be very sensitive to the impedance of the 'antenna'. Is this the
> common mode PtoP that is acceptable at the power leads? In OR out?
>
>
> The supply is $259 with free shipping from Arrow. Same price from Mouser
> but plus shipping. $219 plus $30 shipping from HongKong seller. Mouser
> looks like the best bet because they have a 30 day return policy. Unless,
> someone who has used one of these can tell me about EMI and also about
> whether it is reasonable to turn the supply and Hercules on during transmit
> and off during receive. I'm not talking QSK rates. Just between exchanges.
>
> What say?
>
> 73, -Bob
>
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> --
> -do not look into LASER with remaining eye!
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