[hpsdr] Pure Signal RF Sampler

[DK7XL]

Dick and ALL,

the HPA-8000B PA from Hilberling exploits a RF-Sampler consisting of a
capacitive divider of 5.6 pF and 2.7 nF followed by a 1/2 resitive
divider made with two 100 Ohm resistors.

The overall attenuation is about -60 dB with high flatness within 1.8
and 70 MHz.

I have decribed the PA and the sampler in Ham Radio magazine CQ-DL
(2-2017, 3-2017) sorry, yet only in German.
The entire article can be downloaded here: Part 1 (showing sampler
diagram): http://dl0sdr.de/hpa-8000b-teil-1.html Part 2:
http://dl0sdr.de/hpa-8000b-teil-2.html

73, Klaus, DK7XL/DL0SDR




Am 05.09.2018 um 21:10 schrieb Scott Traurig:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> It may be worth adding that, within reason, higher feedback signal 
> levels are better than lower ones. That way the ratio of feedback 
> signal to any crosstalk signals that might exist remains as high as 
> practical.
>
> 73,
>
> Scott
>
> On Wed, Sep 5, 2018 at 3:02 PM Richard Grubb 
> <richard.n.grubb at comcast.net <mailto:richard.n.grubb at comcast.net>> wrote:
>
>     Thanks Scott.
>
>     The resistive coupler I built is peculiar to the contents of my
>     Junk Box. I used a series parallel arrangement of 9 half watt
>     metal film resistors in three parallel - series groups and a 51
>     ohm terminator to provide -51 dB coupling and the necessary
>     voltage and power rating for 1 kW. It is flat to a dB or so from
>     160 - 6m. Actually the Pure Signal 2 implementation is very non
>     critical on sample levels. The software is completely happy with
>     the linear enabled at 800 - 1000W. However turning the linear off
>     and just having 5W from the ANAN 10, although the software flags
>     low level, it still reduces the IMD by ~30 dB. Kudos to 16 bits of
>     dynamic range. A great piece of software ! Thank you HPSDR
>     programmers !!
>
>     It might be worth including a note on the alternatives here in the
>     Power Signal documentation.
>
>     73, Dick W0QM, G3FNL
>
>
>
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20180907/32a05b96/attachment.html>