HF-150 gone deaf!
 

Having moved house, my HF-150 remained packed in storage for two years.
I have just retrieved. It is as deaf as the proverbial post. However, I
have established that the whip antenna circuit works perfectly. Both
other antenna systems function intermittently. It suggests a severed
connection somewhere. I have the original manual and can access the
circuit diagram. First, am I correct in assuming that I should focus my
attention exclusively on the antenna conections to the RF side of the
board. Second, if anyone out there is familiar with the circuitry could
I be directed as to where I might really focus my inspections. If all
else fails, is anyone out there repairing these excellent radios?
Donal EI5IT

Try Deoxit Gold on the slide switch. Spray a couple spritzes then
cycle the swicth vigorously.

On 9 Jan 2005 06:30:02 -0800, "n17man" wrote:

Having moved house, my HF-150 remained packed in storage for two years.
I have just retrieved. It is as deaf as the proverbial post. However, I
have established that the whip antenna circuit works perfectly. Both
other antenna systems function intermittently. It suggests a severed
connection somewhere. I have the original manual and can access the
circuit diagram. First, am I correct in assuming that I should focus my
attention exclusively on the antenna conections to the RF side of the
board. Second, if anyone out there is familiar with the circuitry could
I be directed as to where I might really focus my inspections. If all
else fails, is anyone out there repairing these excellent radios?
Donal EI5IT

Yes, I looked at the circuit diagram and it has struck me that the
switch could be the problem. Good suggestion! Will definitely try this.

I had to replace the antenna switch on my HF-150. I tried contact
cleaners but that did not work for long. I ordered the switch from the
"Lowe Workshop" a few years ago (hopefully it is still in business).
Replacing it requires quite a bit of disassembly but it can be done
with a good soldering gun, a set of allen wrenches and a lot of
patience.

Jim

On 9 Jan 2005 06:30:02 -0800, "n17man" wrote:

Having moved house, my HF-150 remained packed in storage for two years.
I have just retrieved. It is as deaf as the proverbial post. However, I
have established that the whip antenna circuit works perfectly. Both
other antenna systems function intermittently. It suggests a severed
connection somewhere. I have the original manual and can access the
circuit diagram. First, am I correct in assuming that I should focus my
attention exclusively on the antenna conections to the RF side of the
board. Second, if anyone out there is familiar with the circuitry could
I be directed as to where I might really focus my inspections. If all
else fails, is anyone out there repairing these excellent radios?
Donal EI5IT

"R.F. Collins" E.H. wrote in message
...
I had to replace the antenna switch on my HF-150. I tried contact
cleaners but that did not work for long. I ordered the switch from the
"Lowe Workshop" a few years ago (hopefully it is still in business).
Replacing it requires quite a bit of disassembly but it can be done
with a good soldering gun, a set of allen wrenches and a lot of
patience.

Jim
Lowe can no longer ship directly to the U.S.
I too would suspect this area. If it were permanently low in sensitivity,
the first mixer is the likely culprit- hard to find here in the states.

Dale W4OP

Use a 25-35 Watt pencil-type iron at all times on modern electronics.
Soldering guns are almost always a bad idea.

On Sun, 09 Jan 2005 15:10:08 -0500, R.F. Collins E.H.
wrote:

I had to replace the antenna switch on my HF-150. I tried contact
cleaners but that did not work for long. I ordered the switch from the
"Lowe Workshop" a few years ago (hopefully it is still in business).
Replacing it requires quite a bit of disassembly but it can be done
with a good soldering gun, a set of allen wrenches and a lot of
patience.

Jim

On 9 Jan 2005 06:30:02 -0800, "n17man" wrote:

Having moved house, my HF-150 remained packed in storage for two years.
I have just retrieved. It is as deaf as the proverbial post. However, I
have established that the whip antenna circuit works perfectly. Both
other antenna systems function intermittently. It suggests a severed
connection somewhere. I have the original manual and can access the
circuit diagram. First, am I correct in assuming that I should focus my
attention exclusively on the antenna conections to the RF side of the
board. Second, if anyone out there is familiar with the circuitry could
I be directed as to where I might really focus my inspections. If all
else fails, is anyone out there repairing these excellent radios?
Donal EI5IT

"David" wrote in message
...
Use a 25-35 Watt pencil-type iron at all times on modern electronics.
Soldering guns are almost always a bad idea.

On Sun, 09 Jan 2005 15:10:08 -0500, R.F. Collins E.H.
wrote:

I had to replace the antenna switch on my HF-150. I tried contact
cleaners but that did not work for long. I ordered the switch from the
"Lowe Workshop" a few years ago (hopefully it is still in business).
Replacing it requires quite a bit of disassembly but it can be done
with a good soldering gun, a set of allen wrenches and a lot of
patience.

Jim

Also note that the volume knob is a collett arrangement- use a sharp
blade to pop the cap off and then loosen the collett nut to remove the knob.
I once saw a 150 where the owner had badly scratched the front panel trying
to pry the knob off.

Dale W4OP

And bragged about it on this very usenet group...

On Mon, 10 Jan 2005 17:38:15 GMT, "Dale Parfitt"
wrote:


"David" wrote in message
.. .
Use a 25-35 Watt pencil-type iron at all times on modern electronics.
Soldering guns are almost always a bad idea.

On Sun, 09 Jan 2005 15:10:08 -0500, R.F. Collins E.H.
wrote:

I had to replace the antenna switch on my HF-150. I tried contact
cleaners but that did not work for long. I ordered the switch from the
"Lowe Workshop" a few years ago (hopefully it is still in business).
Replacing it requires quite a bit of disassembly but it can be done
with a good soldering gun, a set of allen wrenches and a lot of
patience.

Jim

Also note that the volume knob is a collett arrangement- use a sharp
blade to pop the cap off and then loosen the collett nut to remove the knob.
I once saw a 150 where the owner had badly scratched the front panel trying
to pry the knob off.

Dale W4OP