[hpsdr] Horton with Trumpet??

[Christopher T. Day]

I have one of those waiting for me to drill some holes and get it into
its box. The amplifier is on a single small PCB. It has no direct
dependence on the filter board; it was originally designed without
filters as it was the driver for the 100W amp. As it happens, the filter
board for the 35W amp works just fine with the 5W guy, but is manually
switched. The filter board for the 100W amp is also separately available
and has auto-switching on it, I believe, though I haven't seen that
board in the flesh.


	Chris - AE6VK


-----Original Message-----
From: Bill Tracey [mailto:bill at ewjt.com] 
Sent: Monday, July 10, 2006 5:56 PM
To: Lyle Johnson; Alex
Cc: hpsdr at hpsdr.org
Subject: Re: [hpsdr] Horton with Trumpet??

***** High Performance Software Defined Radio Discussion List *****

The 100mW in 5 watt out bit can be had from HFProjects.com  -- see their

newsletter section.  They've got a 100mw to 5 watt amp originally
intended 
as a pre amp for a 100 watt amp, but it can also be built with a filter 
board to run 5 watts to an antenna (SlimGem project).   I've got one of 
these in my stack of things to build.   I built their original HF Packer

Amp a few years back for my 1 watt SDR and have been quite happy with
it.

To use this with HPSDR @ the 5 watt level we'd probably have to add T/R
and 
band selection logic to it.  The 100 watt gizmo they've got is auto
sensing 
so may not need a lot of interfacing work.

Regards,

Bill (kd5tfd)

At 07:34 PM 7/10/2006, Lyle Johnson wrote:
>***** High Performance Software Defined Radio Discussion List *****
><....>
>I'd rather see 100 mW or some other power level suitable for driving a
5
>to 10 watt output PA.    <....>
>
>I suspect boosting 100 mW to 5W+ is not a big deal in a push-pull
linear
>PA.  <...>
>Maybe someone needs to take on the HF PA with bandpass filters, etc.,
as
>a project?  I know there already exists the HF packer amp, and perhaps
>others of similar ilk, but they tend to be a little messy to deal with.
>Having the PA and bandpass filters, with T/R switch as an integrated
>assembly on a single PC board that is easily assembled, and directly
>controlled by I2C or SPI or ??? has appeal.  Maybe borrow a page from
>the K2 Tx lineup?  Maybe with the G6ALU amplifier as the core?

<....>
73,

>Lyle KK7P


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