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NanoVNA V2
(my own V1 next to a V2)First a tiny bit of history. The original nanoVNA that originated with a japanese engineer has seen a lot of interest, eddy555's original NanoVNA design has already been...
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N7DCC ATU
This had created some interest on GQRP list so I ordered it again.7x7 version arrived... smt PIC this time (1698 derivative), not soldered to the board yet and not programmed either.I'll include build...
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2" TV Pole Guy Ring
Been asked what does a 3D printed guy ring this look like so here you go this is on the build plate in Prusa Slicer. I printed in PLA you could print in ABS or PETG if you plan in it being up for a...
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Antenna mounts for RSGB IOTA
Just putting in some mounts to put up the RSGB IOTA antennasThat is the old pole and mast next to it, was on a wooden post.The green/yellow wire goes to an extensive ground system.6 foot scaffolding...
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New Balun for hexbeam
I had started to make up new baluns a while back for use with VDA's and a DX trip but never finished the job. G4AWP gave me a few lengths of RG142 which is really flexible.which perfectly suited some...
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S9 Calibrator with sidebands
I knew I had seen it somewhere, wasn't until I started collecting all the radio magazines for scanning I found it. Not that old either.S9 Calibrator with sidebands using Si5351 and an Arduino by...
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GM328 Clone Build.
Having bought one of these cheap component testers from China (I assume) I will blog the build here.Images to follow.The manual I found separately hereThere is a nice youtube of someone reviewing it here
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GM328 Build board stuffing.
Just followed the silkscreen placing components.Not terribly difficult. The Pins on the uPC were a bit bent but straightened fine.Noticed a few things missing.One 27K resistor and couple terminal...
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GM328 Put into case and initial tests
Ran it off a desktop power supply measured at 9.1V DC.Screen reports 9.1V DC.Ran through the self test using 100nF capacitor and a set of joined wires to short probes 1-2-3A 33nf capacitor with this...
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HP 360 RF Power meter
Grabbed a 16x2 LCD from the junk box and and added some inpin pins so it plugged in and then to the SMA input port added a couple 3dB attenuators before a small signal generator and fed it in and it...
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Mast clamps
Will possibly save using so much electrical tape putting up the masts.I use telescoping fishing poles a lot and one issue I notice is that I can end up using a lot of electrical tape to secure the...
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HP360 Power Meter FR4 case
Just pulling together putting this into a case I'll make from FR4 offcuts.Will add 3 push to make switches an on/off, external DC feed and will add an external SMA.getting there, bit bigger than just...
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New hexbeam /Dipole 1:1 FT240-43 balun
Decided to make up the DX Hexbeam and Dipole 1:1 FT240-43 balun that had been knocking about for a bit. Based on the W1JR version.Rather than fit SO239 or N Type sockets going to add pigtails using...
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New 13cm pipe end cap filter
Components RG402 semi rigid, piece of FR4, SMA connectors, 3-22mm pip cutter (to score the shield before removal), Brass M3 nut and bolt (should be M4 but don't have to hand).Holes are 3mm (initially,...
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AC unit replacement.
Looks like AC has failed in shack so neither cools or heats now.Right now operating without any heat in shack is a tad uncomfortable after a while.The AC unit is an old eIQ-12WMINV the original gas was...
View ArticleShellinabox on RaspberryPi
It is definitely not new, and I claim no originality as this idea has been posted elsewhere before, but I mentioned in discussion that I was using this (along with octoprint) on my Raspberry Pi...
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What to build with STM32F746G-Disco and SI5351 Board
I had these in the workshop and as not operating right now, thought what could I make with these and a few other RFy things from the 'junk box'.Well I know have some SA612 and SMD op amps and lots of...
View ArticlePanic.... "Cannot open access to console, the root account is locked."
Last weekend I built myself a nice Pi 4 system for the shack. Everything worked perfectly, but today as I rebooted the Pi would simply not boot up. Usually I run almost all my Pis in a headless...
View ArticleInstalling GQRX and SDR++ on RaspberryPi
Installing GQRX and SDR++ on RaspberryPiThese are all the steps I actually performed.sudo apt updateapt list --upgradablesudo apt install gqrx-sdrrtl_test -tgqrxSo GQRX sort of worked...So SDR++Grab...
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RASPAD3
Will turn this into SDR thing tomorrow. I compiled the SDR++ and GQRX for the RaPi4 yesterday.
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RASPAD3 and SDR++ on RaspberryPi
Going to be trying a few other SDR.Raspberian OS and compiled on the RaPi4 (before putting into RASPAD3). RX only. SDRPlay (version 1)RX and TX. Lime Mini SDR and Adalm Pluto SDR (found it)I use an...
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QBSA Again...
Postie delivered an old part built project, but a very good one. Feels like an eternity passed looking for a replacement for one I sold in error.I was about to loose hope as spoke to Steve KD1JV and he...
View ArticleCores for baluns
I have this printed out as I refer to it often enough so I reproduced it here (I cannot recall the original source tbh but all the values are in several reference books anyway) I got loads of torroids...
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TE-2101 antenna analyzer
This is tiny.Amazing bit of homebrew.The manual is in Japanese but the block diagram explains how it works nifty bit of engineering with the case (3D printed and bent acrylic sheet). The PCB doubles...
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Analogue Display Digital VFO
Following the original by JF3HZB (PW October 2022 p56) I have bodged mine sort of based on the originalhttps://github.com/tjlab-jf3hzb/Digital_VFO_with_analog_dialhttps://tj-lab.org/2019/02/17/vfo5/I...
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