[hpsdr] Pre-Distortion

[Jeff Kelly]

Is there any thought on making the board a TAPR project?

Jeff
K2SDR



-----Original Message----- 
From: Helmut, DC6NY
Sent: Sunday, December 08, 2013 8:10
To: 'Clyde Washburn' ; 'n3evl' ; hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Pre-Distortion

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

Hi Clyde,

-20 to -15dBm at the RX port would be fine to operate the ADC with best
resolution, i.e. 80 dB total attenuation assuming a legal power amp. Make
sure that crosstalk isolation isn't less of this value.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: Clyde Washburn [mailto:k2ue at rochester.rr.com]
Gesendet: Sonntag, 8. Dezember 2013 13:30
An: 'Helmut, DC6NY'; 'n3evl'; hpsdr at lists.openhpsdr.org
Betreff: RE: [hpsdr] Pre-Distortion

Some of us already have taps in place for signal monitoring -- what is the
actual desired tap level at the output to the receiver?

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Helmut, DC6NY
Sent: Saturday, December 07, 2013 4:40 PM
To: 'n3evl'; hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Pre-Distortion

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

Hi Pete,

1)The pre-distortion method needs also a modified FPGA code which is at this
time only available for the Hermes board. I'm rather sure that the other
OpenHPSDR exciter boards will follow.
2)I don't know whether any of the testers has used a tube amplifier in the
chain. Basically it should work. You are right, the sampler has to be
inserted at the end of the amplifier chain directly into the feeder.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von n3evl
Gesendet: Samstag, 7. Dezember 2013 21:42
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Pre-Distortion

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

Just a general question or two on the pre-distortion feature:

1) Will this be applicable to Atlas/Mercury/Penny based systems too or is it
just for Hermes based systems?

2) Does the number of amplifiers in the chain matter - for instance my
Penelope drives Munin which in turn drives my AL-811H (via
Alex) - so I'm assuming the TX signal going to the antenna is where the
sampling and feedback would take place.

Thanks,

Pete, N3EVL


On 12/7/2013 10:51 AM, Helmut, DC6NY wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi All,
>
> The progress of the pre-distortion software is remarkable. I suppose
> the general release is coming up soon. You will need an appropriate RF
> sampler in the feedback loop to use this great functionality. For all
> and especially for the home-brewers, who will be prepared for this
> exciting date, I put some info about such a device on
> http://www.hamsdr.com/dnld.aspx
>
> Season's Greetings.
>
> 73, Helmut, DC6NY
>
>
>
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