In article . com,
"billcalley" wrote:

Another quick question for anyone who is familiar with the Kenwood
TS-530S with the 500Hz CW filter installed, but I noticed that unless
I move IF-SHIFT counter-clockwise, the audio output is not centered on
800 Hz, but more like 1200 Hz or so. Is this normal for Kenwoods?

Bill-

I haven't worked on the TS-530. In other similar models there are
typically three crystals associated with the product detector, one for
CW, one for USB and one for LSB. If the crystal is off frequency, it
will cause a signal to be offset from its correct place in the IF filter
passband.

For the TS-520, these crystals appear to be on the carrier unit along
the left side of the radio on the bottom. Each crystal has a parallel
trimmer capacitor. As you adjust the frequency of the detector's CW
crystal, the background noise will sound different as you tune across
the filter's passband.

You need a counter and a diagram to set the crystal frequencies
correctly. The TS-520 service manual I downloaded does not seem to have
directions to do it. I would connect the counter to the output of the
carrier unit, and adjust each crystal to its correct frequency, selected
with the front panel CW/USB/LSB switch. The IF-Shift control should be
centered when making these adjustments.

If you can't read the frequency marked on the crystal, it should appear
in the parts list.

Fred
K4DII

On Apr 15, 12:18 pm, Fred McKenzie wrote:
In article . com,

"billcalley" wrote:
Another quick question for anyone who is familiar with the Kenwood
TS-530S with the 500Hz CW filter installed, but I noticed that unless
I move IF-SHIFT counter-clockwise, the audio output is not centered on
800 Hz, but more like 1200 Hz or so. Is this normal for Kenwoods?

Bill-

I haven't worked on the TS-530. In other similar models there are
typically three crystals associated with the product detector, one for
CW, one for USB and one for LSB. If the crystal is off frequency, it
will cause a signal to be offset from its correct place in the IF filter
passband.

For the TS-520, these crystals appear to be on the carrier unit along
the left side of the radio on the bottom. Each crystal has a parallel
trimmer capacitor. As you adjust the frequency of the detector's CW
crystal, the background noise will sound different as you tune across
the filter's passband.

You need a counter and a diagram to set the crystal frequencies
correctly. The TS-520 service manual I downloaded does not seem to have
directions to do it. I would connect the counter to the output of the
carrier unit, and adjust each crystal to its correct frequency, selected
with the front panel CW/USB/LSB switch. The IF-Shift control should be
centered when making these adjustments.

If you can't read the frequency marked on the crystal, it should appear
in the parts list.

Fred
K4DII

Hi Fred,

Thanks for the tip! So that I don't FUBAR this up, please tell me if
I have this right (changed from your original description to take
advantage of my very limited equipment):

1. Set the MODE to CW and the IF-SHIFT to center detent position of
the TS-530S.
2. Find the single trimmer capacitor located near the 500Hz CW filter
(the trimmer capacitor will be able to shift the 500Hz CW filter
center frequency by some small amount).
3. View the TS-530S's audio speaker output noise on my audio spectrum
analyzer.
4. Adjust the TS-530S's trimmer capacitor until the audio (mainly
noise) output is -centered- on 800 Hz, according to the audio spectrum
analyzer's screen.

Would the above technique work?

Thanks!

-Bill

billcalley wrote:

Thanks for the tip! So that I don't FUBAR this up, please tell me if
I have this right (changed from your original description to take
advantage of my very limited equipment):

1. Set the MODE to CW and the IF-SHIFT to center detent position of
the TS-530S.
2. Find the single trimmer capacitor located near the 500Hz CW filter
(the trimmer capacitor will be able to shift the 500Hz CW filter
center frequency by some small amount).

You can't shift the CW filter, so you must shift the xtal oscillator
that provides the BFO injection signal for the CW mode.

3. View the TS-530S's audio speaker output noise on my audio spectrum
analyzer.
4. Adjust the TS-530S's trimmer capacitor until the audio (mainly
noise) output is -centered- on 800 Hz, according to the audio spectrum
analyzer's screen.

That is correct, you must adjust the xtal BFO trimmer so that the IF noise
shows up centered on the desired CW note frequency.

-Chuck

On Apr 15, 3:44 pm, Chuck Harris wrote:
billcalley wrote:
Thanks for the tip! So that I don't FUBAR this up, please tell me if
I have this right (changed from your original description to take
advantage of my very limited equipment):

1. Set the MODE to CW and the IF-SHIFT to center detent position of
the TS-530S.
2. Find the single trimmer capacitor located near the 500Hz CW filter
(the trimmer capacitor will be able to shift the 500Hz CW filter
center frequency by some small amount).

You can't shift the CW filter, so you must shift the xtal oscillator
that provides the BFO injection signal for the CW mode.

3. View the TS-530S's audio speaker output noise on my audio spectrum
analyzer.
4. Adjust the TS-530S's trimmer capacitor until the audio (mainly
noise) output is -centered- on 800 Hz, according to the audio spectrum
analyzer's screen.

That is correct, you must adjust the xtal BFO trimmer so that the IF noise
shows up centered on the desired CW note frequency.

-Chuck


Cool -- thanks Chuck!

73,

-Bill

All I can say is if you follow those directions, Good Luck.

--

Clif Holland KA5IPF
www.avvid.com




"billcalley" wrote in message
oups.com...
On Apr 15, 3:44 pm, Chuck Harris wrote:
billcalley wrote:
Thanks for the tip! So that I don't FUBAR this up, please tell me if
I have this right (changed from your original description to take
advantage of my very limited equipment):

1. Set the MODE to CW and the IF-SHIFT to center detent position of
the TS-530S.
2. Find the single trimmer capacitor located near the 500Hz CW filter
(the trimmer capacitor will be able to shift the 500Hz CW filter
center frequency by some small amount).

You can't shift the CW filter, so you must shift the xtal oscillator
that provides the BFO injection signal for the CW mode.

3. View the TS-530S's audio speaker output noise on my audio spectrum
analyzer.
4. Adjust the TS-530S's trimmer capacitor until the audio (mainly
noise) output is -centered- on 800 Hz, according to the audio spectrum
analyzer's screen.

That is correct, you must adjust the xtal BFO trimmer so that the IF
noise
shows up centered on the desired CW note frequency.

-Chuck


Cool -- thanks Chuck!

73,

-Bill

Clif Holland wrote:
All I can say is if you follow those directions, Good Luck.


Very well, please explain the correct method.

-Chuck

In article om,
"billcalley" wrote:

2. Find the single trimmer capacitor located near the 500Hz CW filter
(the trimmer capacitor will be able to shift the 500Hz CW filter
center frequency by some small amount).

Bill-

You may be able to accomplish your goal without a counter, but the
trimmer you need to adjust is one of a group of three next to three
crystals on the carrier unit. It is probably not on the filter board
unless the two boards are combined in the TS-530.

I don't know for sure if the TS-520 manual is applicable. Although it
shows the crystals and trimmers in a photo and on the circuit diagram, I
couldn't find a procedure for their adjustment. It would help if you
could find a copy of the TS-530 service manual.

Fred
K4DII

The 520 and 530 are about as close as an elephant and a donkey.... About the
only thing they have in common is tubes finals and the brand.

--

Clif Holland KA5IPF
www.avvid.com




"Fred McKenzie" wrote in message
...
In article om,
"billcalley" wrote:

2. Find the single trimmer capacitor located near the 500Hz CW filter
(the trimmer capacitor will be able to shift the 500Hz CW filter
center frequency by some small amount).

Bill-

You may be able to accomplish your goal without a counter, but the
trimmer you need to adjust is one of a group of three next to three
crystals on the carrier unit. It is probably not on the filter board
unless the two boards are combined in the TS-530.

I don't know for sure if the TS-520 manual is applicable. Although it
shows the crystals and trimmers in a photo and on the circuit diagram, I
couldn't find a procedure for their adjustment. It would help if you
could find a copy of the TS-530 service manual.

Fred
K4DII