
LA2YUA - RF and related projects
Ericsson ORION, various notes
A collection of various info and thoughts about the Orion radio system, also sold under GE and M/Acom brandings.
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Motorola MX1000/2000 Programming
More HP/Symmetricom/Microsemi 58534A-H01 pictures
I bought some more 58534A-H01 receivers and found that these receivers were of the older type I had seen low resolution pictures of before.
Continue reading...Photos of some pole mounted GPS timing receivers
On a whim I bought some pole mount GPS receivers.
Being unable to find any real details on what's inside I mostly bought them blind, so I took some photos of the insides to help others out.
Continue reading...LBQ-450 3-cavity UHF bandpass filter
I bought a chinese made 3-cavity bandpass filter and decided to measure it and compare it to some home-made modified duplexer filters.
Updated: VHF information below
Continue reading...Spectracom Epsilon Clock EC2S, Overview and Configuration
The Spectracom Epsilon Clock EC2S and similar devices are fairly high end GPS clocks/timing receivers.
I've spent a few days with one and I wrote a utility to program the device that is available for download.
Continue reading...Retuning a Procom BPF 2/3 150H Cavity Filter
A Procom VHF cavity band-pass filter was donated to the shack, and some work was done to retune it to 145 MHz.
Continue reading...The Ascom SE-140, programming and other mods
I bought some Ascom SE-140s and figured out how to program them without buying a 386 computer and floppy disks.
Continue reading...Adding Optical I/O to the Sony MDS-E12 MiniDisc Recorder
I picked up a 18 year MiniDisc recorder and restored it a bit, and added some optical I/O to it.
Continue reading...Behringer DCX2496 Failed Update Recovery
Icom IC-775DSP LED Backlight Modification
I modified my IC-775DSP with backlighting and thought you might want to as well.
Continue reading...Modifying Icom IC-V200Ts for 12.5 kHz channels
I looked in to modifying the IC-V200T for use with modern repeaters with 2.5 kHz deviation.
Continue reading...Modifying the Icom IC-H16T for 12.5 kHz Channels
I looked in to modifying the IC-H16T for use with modern repeaters with 2.5 kHz deviation.
Continue reading...Upgrading Icom H16T ROMs to Super 150 V200T Firmware
In this article I desribe how you can upgrade your H16T to use the Super-150 custom firmware developed for Icom V200T LMR radios. Be warned that some hardware modding and EPROM programming is required.
Continue reading...A Simple 3D Printed Mounting Solution for Lucent RFTG-u GPS Receiver
I've designed a 3D printable solution for rack mounting Lucent RFTG-u receivers on cheap 2U shelves.
Continue reading...Upgrading Icom CM-x battery packs with Li-Ion/Li-Po cells
To support my pile of Icom IC-H16Ts I decided to upgrade my original Ni-Cd packs to newer cells.
Continue reading...VXR-9000 PA Failure, Fan Failure, Funky CTCSS, Fun PA De-Capping
Recently we became aware of a failure in one of our VHF repeaters, users claimed the output power was significantly worse while the sensitivity was the same.
Continue reading...Wavetek/Schlumberger Stabilock 4015, Fluke 6060B ROM dumps
In the interest of public service and guarding against future failures, I pulled the EPROMs from my Wavetek/Schlumberger Stabilock 4015 Service Monitor, and Fluke 6060B RF generator.
Continue reading...Vertex Standard VXR-9000 VHF High to VHF Low Conversion
This page describes how to convert a VXR-9000 VHF C repeater to a VHF A version.
Continue reading...Repairing Icom IC-V200T Front Panel Plastic Screw Holes
I try an epoxy technique to repair the front panel attachment points in the Icom IC-V200T.
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Icom IC-H12 and IC-H16T Service Manual
I acquired several Icom IC-H12 radios, and some IC-H16Ts including original issue Service Manuals for them. Here are links to some scanned documentation. The H16T service manual is widely available, but I scanned the foil pages since Icom official scans are useless there. Several notes on adjustments and mods Note:…
Continue reading...MC349X5-016 77.76 MHz VCXO
This page has some info on the MC349 VCXO, that has been available on eBay in large quantities at low cost.
Continue reading...CRCD83(A) RAMBUS Clock Generator as a Local Oscillator for Radios
To investigate a simple way of generating local oscillators for my UHF transmitter, the CDCR83 was put on a 4 layer board and fed with frequencies from 10-150 MHz at various multiplication settings. As usual a bag of these was found on eBay and as such there was some incentive to find a use for them.
Continue reading...NDK 110E39 Crystal Filter
Background: a set of 110.51 MHz filters were acquired on eBay per usual, and I ended up with around 400 of them. Part number was 110E39. No data sheet was available, though a potentially related data sheet for 90 MHz filters in the same package was available from NDK. Here…
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