LA2YUA (11)

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VXR-9000 PA Failure, Fan Failure, Funky CTCSS, Fun PA De-Capping

PA Failure, Fan FailureRecently 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.During an initial field survey we noted the fan running continuously, but were primarily looking for antenna related issues. As neither…

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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. Icom IC-H12 Service ManualIcom IC-H12 Service Manual.pdf  Icom…

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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.

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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 is the…

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The 8801A Receiver

The 8801A receiver is very similar to the F955 receiver, so a lot of the technical documentation can be referenced: http://www.jancorver.org/en/ombouw/ericsson/f955/The main manual is in Dutch, but it’s still somewhat understandable due to the excellent diagrams drawn by PA0IB.

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