SFP Connector

20pin SMD connector + cage for SFP transceiver.


Some views of 1 Gbit/s (that's 1.25 GHz, or 800 ps per bit) synchronous ethernet bit-patterns.

4 GHz 'scope

We got this 4 GHz 'scope at work. 111 ps is roughly as expected for the rise-time of a fast edge. Signal from a leo bodnar pulse generator.

RA0SMS mini-whip

New RA0SMS mini-whip antenna on the roof. The old one lasted from 2017/02 to 2018/10.


ONET1191P, Limiting amplifier for up to 11 Gbps.

Korso MTB

Some MTB-trails in Korso today. Still some snow in places. Around 14km.


THS3491 looks like an interesting op-amp for distribution amplifiers and in general for LF/HF work. However it turns out it is a bit finicky about the feedback resistors (high resistance values are stable but noisy, low values would give low noise but might be unstable). We're sticking with LMH6702 for now..

HMC394 2.2 GHz prescaler

HMC394 is a 2.2 GHz programmable prescaler (5-bit counter) with divide-ratios from /2 to /32.

SMA-to-SFP frequency stability

Some old plots from 2017 of the residual phase-noise at 10MHz when the signal is fed through an SMA-to-SFP board, SFP to optical, 2m optical fibre, then SFP back to electrical, and another SFP-to-SMA board.

One version of the board is on github: https://github.com/aewallin/SFP2SMA_2018.03

As a comparison the noise-floor of the 3120A and a frequency distribution amplifier is also shown.


DDS with 47-bit tuneable frequency word.

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