Greetings,

I wonder if someone can help point me in the right direction with a set
of 'twins' I'm trying to get working right. I finally have the receiver
sensitivity back and I've been through the complete alignment procedure
in the service manual. The problem that remains is that the receiver is
about 600 - 700Hz below the transmitter in LSB mode. Other modes seem
to line up ok. Also, in LSB the 'sound' seems a little weaker than on
USB, yet the apparent signal strength (S-meter reading) doesn't seem to
change.

I'm quite a newbie to RF electronics and have gotten quite an education
with it thus far. I'm sure there's some silly little thing I'm
overlooking, but I'm stuck. I'd be most grateful for any tips or
suggestions.

Thanks much and Happy Holidays!

--
Randall D. DuCharme (Radio AD5GB)

Powered by FreeBSD! ( http://www.freebsd.org )
The Power to Serve!

"AD5GB" wrote in message
...
Greetings,

I wonder if someone can help point me in the right direction with a set
of 'twins' I'm trying to get working right. I finally have the receiver
sensitivity back and I've been through the complete alignment procedure
in the service manual. The problem that remains is that the receiver is
about 600 - 700Hz below the transmitter in LSB mode. Other modes seem
to line up ok. Also, in LSB the 'sound' seems a little weaker than on
USB, yet the apparent signal strength (S-meter reading) doesn't seem to
change.

I'm quite a newbie to RF electronics and have gotten quite an education
with it thus far. I'm sure there's some silly little thing I'm
overlooking, but I'm stuck. I'd be most grateful for any tips or
suggestions.

Thanks much and Happy Holidays!

--
Randall D. DuCharme (Radio AD5GB)

Powered by FreeBSD! ( http://www.freebsd.org )
The Power to Serve!


Your problem is the LSB crystal in one or both the Rx and the Tx have
changed.

Also the crystal filters have changed.

In most cases they crystals will drift downward in frequency with age.

You need to have extensive test equipment,,,or you can wing it.

Try adjusting the tx LSB xtal only to match with the receiver. Play around
between them both.

Have fun.

Dan/W4NTI

Dan/W4NTI wrote:

Your problem is the LSB crystal in one or both the Rx and the Tx have
changed.

Also the crystal filters have changed.

In most cases they crystals will drift downward in frequency with age.

You need to have extensive test equipment,,,or you can wing it.

Try adjusting the tx LSB xtal only to match with the receiver. Play around
between them both.

Have fun.

Dan/W4NTI

Hi Dan,

I was hoping that wasn't it. Don't know where to get crystals for it
that would be any better than what's already in it.

Have a 'scope, counter, RF generator and various meters, but am pretty
green with it all. Good experience though!

Thanks for your reply.


--
--
Randall D. DuCharme (Radio AD5GB)

Powered by FreeBSD! ( http://www.freebsd.org )
The Power to Serve!

AD5GB wrote:
Dan/W4NTI wrote:

Your problem is the LSB crystal in one or both the Rx and the Tx have
changed.

Also the crystal filters have changed.

In most cases they crystals will drift downward in frequency with age.

You need to have extensive test equipment,,,or you can wing it.

Try adjusting the tx LSB xtal only to match with the receiver. Play
around
between them both.

Have fun.

Dan/W4NTI


Hi Dan,

I was hoping that wasn't it. Don't know where to get crystals for it
that would be any better than what's already in it.

Have a 'scope, counter, RF generator and various meters, but am pretty
green with it all. Good experience though!

Thanks for your reply.



Its probably only a minor tweak. Nothing to buy.
Collect the documentation and go for it...nothing to lose and everything
to gain in this case.

-Bill

"AD5GB" wrote in message
...
Dan/W4NTI wrote:

Your problem is the LSB crystal in one or both the Rx and the Tx have
changed.

Also the crystal filters have changed.

In most cases they crystals will drift downward in frequency with age.

You need to have extensive test equipment,,,or you can wing it.

Try adjusting the tx LSB xtal only to match with the receiver. Play
around
between them both.

Have fun.

Dan/W4NTI

Hi Dan,

I was hoping that wasn't it. Don't know where to get crystals for it
that would be any better than what's already in it.

Have a 'scope, counter, RF generator and various meters, but am pretty
green with it all. Good experience though!

Thanks for your reply.


--
--
Randall D. DuCharme (Radio AD5GB)

Powered by FreeBSD! ( http://www.freebsd.org )
The Power to Serve!


The problem is even if you do get some brand new rocks for the units you
will find that the crystal filters have also 'drifted'. So I had to just
tweak and hope till I got things at least close.

They really are good radio's.

Dan/W4NTI

"- - Bill - -" exray@coquidotnet wrote in message
...
AD5GB wrote:
Dan/W4NTI wrote:

Your problem is the LSB crystal in one or both the Rx and the Tx have
changed.

Also the crystal filters have changed.

In most cases they crystals will drift downward in frequency with age.

You need to have extensive test equipment,,,or you can wing it.

Try adjusting the tx LSB xtal only to match with the receiver. Play
around
between them both.

Have fun.

Dan/W4NTI


Hi Dan,

I was hoping that wasn't it. Don't know where to get crystals for it
that would be any better than what's already in it.

Have a 'scope, counter, RF generator and various meters, but am pretty
green with it all. Good experience though!

Thanks for your reply.



Its probably only a minor tweak. Nothing to buy.
Collect the documentation and go for it...nothing to lose and everything
to gain in this case.

-Bill


Agreed...nothing ventured, nothing gained.

Dan/W4NTI