[Skimmertalk] Red Pitaya 1:14 impedance transformator + SV1AFN pre-amplifier

Martin Rath martin.rath at gmail.com
Sun Oct 22 19:32:05 EDT 2017

Hi Saki,

I use Maki's J310 LNA in front of the red pitaya for 2 2 reasons:
1) additional gain. As per Maki himself the res pitaya requires an
additional 5-10 dB amplification.
2) to protect the inputs: less than 2 were after i got the RP a close by
lightning took out the AD8066 op amp. I did manage to replace don't want to
so that all too often: Singapore gets hit by major t-storms over 200 days
per year. Running a skimmer here is not always easy as i cannot always be
home to unplug the antennas. I would much rather have to replace a J310
than the AD8066 another time.

I'm happy with the performance. I'm still waiting for one 14:1 transformer
but it's already on the way.

73's Martin 9V1RM
On Mon, 23 Oct 2017 at 00:13, DD5XX (Saki) <dd5xx at web.de> wrote:

> Hello all,
> thanks to Bob (N6TV) I got one of those Red Pitaya impedance
> transformator 1:14. I wonder if anyone did try to add a pre-amplifier on
> the input and if so what is your experience ? I have heard and did read
> lots of positive feedback on the pre-amplifier offered by SV1AFN on his
> website. I would be interested in the kit "J310 push-pull HF pre-amp
> 0.5-54MHz" (see "https://www.sv1afn.com/j310preamp.html"). Do you think
> to gain some more dB performance with this combination ?
> Red Pitaya INPUT1 <---- 1:14 impedance transformator <---- SV1AFN pre-amp
> Looking forward into your comments.
> 73
> Saki, DD5XX
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