[hpsdr] Hermes-Lite 2 and the Hermes Redesign with 5W Amp

[Steve Haynal]

Hi Kjell,

As you probably know, the AFT05MS003N is not rated SWR rugged above 9V. How
do you plan to deal with that? How do you plan to dissipate the extra heat?
We have found heat sinking of these devices challenging. Claudio has tested
up to 9V.

It is tempting to go with Altium because you have an expert, but I strongly
encourage you to evaluate whether openhpsdr wants to use proprietary tools
when good open source alternatives exist and are shown to work. This is one
major reason why I have never joined openhpsdr and TAPR. Many key openhpsdr
design files and methodologies are not open source. If openhpsdr truly
wants to call itself an open source project accessible to all, then now is
the time to make the choice to go with a more open source tool flow.

One other Hermes-Lite feature you may be interested in is LVDS
communication between mutliple modules. We plan to synchronize receivers
that way. The LVDS on the Cyclone IV we use is not that fast, we expect
~152 mb/s, but the stamdard LVDS on the Cyclone10 and Spartan7 will be
faster.

73,

Steve
KF7O







On Mon, May 29, 2017 at 2:30 AM, Kjell Karlsen <la2ni at online.no> wrote:

> Hi Steve.
>
> Thank you for the information of Hermes-Lite. I have followed the project
> for some time but I have not gone into it in details. I must say I am
> impressed of the results and the cost is very low. I do not feel that the
> two projects are in direct competition as the price on Hermes 2M is going
> to be much higher even if we try to get it as low as possible.
>
> The 5W PA we are going to use is with the same transistors as you are
> going to use. We run them on 12V Vdd and the IM3 is very good even at 5W
> out.
>
> I am going to read your information thorough and discuss with the group.
> So we may use some of your solutions.
>
> The reason for using Altium is that Endre,YO6OGJ is an expert using it. I
> have tested KiCad and find the learning curve is very steep. I am too old
> to start learning a new CAD program, I am still using Ultiboard v5,71 from
> around year 2000 and it is good enough for me!
>
> I really hope that we can cooperate in the future!
>
> 73, Kjell
>
>
>
>
>
> På Mon, 29 May 2017 07:23:37 +0200, skrev Steve Haynal <
> steve at softerhardware.com>:
>
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