RadioBanter - R71A Dead Below 7998!

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RadioBanter (https://www.radiobanter.com/)

- Shortwave (https://www.radiobanter.com/shortwave/)

- - R71A Dead Below 7998! (https://www.radiobanter.com/shortwave/72210-r71a-dead-below-7998-a.html)

Telamon

June 7th 05 05:10 AM

In article ,
"Brian Hill" wrote:

"Telamon" wrote in message
..
.
In article . com,
wrote:

Good point from DK! These receivers are absolutely notorius for solder
joints that go bad over time. I have several friends with R-71As that
have had numerous solder connection problems over time but have been
able to fix them themselves. The radio is a "rat's nest" of cables and
wires inside unfortunately.

That's not the only radio with soldering problems. My couple year old
$4K Ten-Tec started dying on me after a few minutes of operation. It
would be working normally and then light for the signal strength meter
would go out, the meter would go to half scale and the audio would drop
out. That was to many things failing at the same time so I suspected
power supply problems. This radio has a status led for each of the four
power supply voltages and looking through the top grill sure enough I
saw one of them go out when the radio malfunctioned. Turned out to be
the +12V supply. Turned out that most of the solder connections on the
power supply output connector were cracked on the power supply board.

--
Telamon
Ventura, California

What Model is your Ten-Tec Tel?

RX340, the $4,000 buck radio with the $100 switching power supply that
runs to hot due to restricted air flow.

--
Telamon
Ventura, California

Telamon

June 7th 05 05:25 AM

In article . com,
wrote:

Solder problems seem to be the case in all the cheezy "yellow board",
single-sided consumer grade pc boards. I see it all the time in
cheap power supplies. If the boards have plated thru holes the
problem is almost non-existent.

It's a single sided board. You think the hole plating is going to help
relieve mechanical or heat stress? I think you mean an actual rivet
right?

A hole in a circuit board can have three types of through construction
in increasing order of duty:

1. Plated through.

2. A cylinder of copper inserted and then plated to the top and or
bottom pads.

3. A rivet of copper. The cylinder of copper is inserted in the board
longer than the board thickness and crimped to the board pads.

My descriptions are a little clumsy as I don't know the exact board
fabrication terminology.

I expect you mean #3.

These power supply manufacturing companies have a lot of tough
competition and try to figure a way to squeeze every penny out of the
cost of a supply.

--
Telamon
Ventura, California

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