On Thu, 11 Mar 2004 23:20:54 -0500, "Andy in NJ" SHORECOGS at COMCAST
DOT NET wrote:

"2LD751" wrote in message
. com...
I have a TRC-458 (Has the 858 PLL). I need to replace the switches for
the extra channels. The mod that I found says to use two switches -
one SPST and one SPDT center off. The switches that are currently in
the radio (and are broken) are DPDT switches. The one in the S1
position only has two wires hooked up to it. The S2 has three wires.
The wires are soldered across both rows on each switch.

My question is this - should I replace the switches with what the mod
says or use the same switches as what's in there? I'm assuming that
the person that did the mod may not have had the right switches, so he
just used DPDT switches instead. The previous owner of the radio said
that the buttons on front, for the NB, etc... are also used with the
extra channels, but the mod I found makes no mention of extra channels
with these buttons.

Any ideas?

I replaced the broken switches with the SPST and SPDT switches as the mod
says, and I only get the standard 40 channels. With the switches in the
other positions, I don't get the standard channels according to the mod
commonly found on the net.

That's what I was referring to when I said that everybody had their
own "style". You may have to use a different method to access the
channels, according to the style that your particular mod was made.



I'll replace them with the same switches that
were in there (apparently two DPDT switches) and see what happens. Once
that's done, I'll have to tackle the problem of why there's no audio with
two different mic's.

Now that could be a problem. What are the particulars? Does the radio
have receive audio? Does it have modulation on SSB? The chances are
that two different mikes are not both bad. But it does help to check
them on a known good radio.


I'd still like to know what mod the tech went by, as is
appears pushing some of the front buttons affect the frequency, but I
suppose that might be an after effect of not having the right switches.

The original tech may have utilized the PA and ANL -NB switches for
some of the frequency mods. I never liked doing that unless you could
get by with a single switch (which was rare). As long as you are
required to use more switches than what's available on the radio, you
might as well use all external switches, and leave the factory
functionality intact.



Once the switches are replaced and I have the results, I'll post it here for
information.


I'd like to hear how you made out.

Dave
"Sandbagger"
http://home.ptd.net/~n3cvj