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SV8YM
Amateur radio, technical and other records
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The Mysterious Case of the Withering Filters
The ceramic filters found in almost all radio communications equipment are indeed extremely useful components. Small, cheap and efficien...
Does your FT-857 display look like a zebra?
I have come across several cases of malfunctioning display in the control head of the FT-857, where several "scan lines" in th...
Lift the withering spell off those ailing ceramic filters!
As promised , here is the solution to the "withering ceramic filter" problem. The mod here was performed in a TM-D710, but ...
*UPDATE* TO THE IC-7000 DRIVER UNIT FAILURE PROBLEM
THIS INFORMATION IS NOT UP TO DATE - PLEASE CHECK THE POST OF JULY 1, 2010!! After my first experiences with this problem, I had rece...
More on the withering filters case: The TS-2000 disappearing noise conundrum
A few months ago, a friend gave me his TS-2000 to check, because occasionally there was a crackling noise coming out of the speaker (and ...
Good news: YAESU has added the DC blocking capacitors at the IF filters of the FT-857D!
Fig. 1. The new FT-857D PCB. Sometimes I think it's mothing short of a miracle that we can buy new technology products (like ou...
The Withering Filters: A microscopic view
In a previous post I discussed the deleterious effects of electromigration and corrosion on ceramic intermediate frequency filters, when ...
The Leaking Electrolytic Capacitor Plague and my Tek TDS-460
There are many good things in life , but bad ones tend to take more of humanity's time. There is compassion, love, science, understa...
Some more mods for the IC-7000 amplifier chain
During the efforts to cure the self-destructive tendencies of the DRIVER unit of the IC-7000, I noticed that the pre-driver transistor, ...
Latest developments on the IC-7000 amplifier issue
After receiving an e-mail from Jan, DG3FDM (thanks, Jan!), who points out a mistake I made with the position of the anti-parasitic resisto...
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About Me
SV8YM
Hi! My name is Tasos Thomaidis. In this blog you'll find records of my ham radio experiments and adventures (mostly technical stuff).
View my complete profile