I have received the 40.5Mhz crystals I ordered for use in the SoftRock to
allow operation on 30M. It is not going to be strictly plug and play. I
built my first Softrock with a socket for the crystal, and have been able to
get it to run with several crystals that run at less than the "stock" 28.224
Mhz. Was listening to 80M last night with a 14.318 Mhz xtal in there (Rx
center freq abt 3.58 Mhz) signals were slightly down due to the front end
filter, but it worked pretty well- Except for some 40M SWBC images.

I cannot get the 40.5Mhz crystals to fire in an unmodified SR40. I
breadboarded the oscillator cicuit from the SR40, and WAS able to get the
crystals to work if I removed C6 and C7 (100pf). When I replaced them with
33pf caps, I could get both the original crystal, and the 40.5Mhz crystal to
fire up fine. However, I could not repeat this by replacing C6 and C7 on a
SR40 circuit board. I'm not sure yet what the difference is (between my
breadboard lash-up and the PC board, maybe other stray capacitances) I do
plan to do some additional experimenting. Possibly my stock of 2n3904s are
better(?) The ones supplied should work at this freq ok, so I'm not sure.

In any event, I am now sure these crystals work on the fundamental freq of
40.5Mhz. It looks like some mods will need to be done to a board to allow
operation at that high a freq.

I'll keep ya all posted.

73,
Bruce N1RX

开云体育

Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
?

Good Evening Bruce and others,

Very good on what you are doing Bruce to get the SR40 running on 30
meters.

One comment on your 80 meter operation with the 14.318 MHz clock
with the BPF stock. The response of the QSD will only be down 6 dB
for third harmonic signals without the BPF helping out on the band
of interest. Since the stock BPF is fairly broad, I wonder if the
SWBC interference you were hearing was actually around 10.738 MHz?
If you have a moment some time to check, it would be interesting to
know.

I am sure a number of us will be quite interested in hearing about
your 30 meter efforts and results.

73,
Tony KB9YIG

--- In softrock40@..., "Bruce Beford"
<bruce.beford@v...> wrote:

I have received the 40.5Mhz crystals I ordered for use in the

SoftRock to

allow operation on 30M. It is not going to be strictly plug and

play. I

built my first Softrock with a socket for the crystal, and have

been able to

get it to run with several crystals that run at less than

the "stock" 28.224

Mhz. Was listening to 80M last night with a 14.318 Mhz xtal in

there (Rx

center freq abt 3.58 Mhz) signals were slightly down due to the

front end

filter, but it worked pretty well- Except for some 40M SWBC images.

I cannot get the 40.5Mhz crystals to fire in an unmodified SR40. I
breadboarded the oscillator cicuit from the SR40, and WAS able to

get the

crystals to work if I removed C6 and C7 (100pf). When I replaced

them with

33pf caps, I could get both the original crystal, and the 40.5Mhz

crystal to

fire up fine. However, I could not repeat this by replacing C6 and

C7 on a

SR40 circuit board. I'm not sure yet what the difference is

(between my

breadboard lash-up and the PC board, maybe other stray

capacitances) I do

plan to do some additional experimenting. Possibly my stock of

2n3904s are

better(?) The ones supplied should work at this freq ok, so I'm

not sure.

In any event, I am now sure these crystals work on the fundamental

freq of

40.5Mhz. It looks like some mods will need to be done to a board

to allow

operation at that high a freq.

I'll keep ya all posted.

73,
Bruce N1RX

The radio went together fairly easily, though I'm at
a loss to figure out why an experimenter's radio is
jammed onto such a small board. This might be OK for
a production rig, but some room would be nice to
experiment.

That said, the radio works except there is no image
rejection and the DSP image rejection controls do
nothing. The instructions say, "If the image cannot
be nulled at least 50 db, then a problem exists..."
Well, some guidance would have been helpful.
Especially, given my opening criticism.

I am reluctant to tear into this think quite yet as
there is not a lot of room to work. I originally
thought it may be a transformer mis-wiring on my part.

Again, we're talking an experimenter's radio on 40
meters? where things are relatively less critical than
other bands, so a little larger toroid with more room
to make changes would make it a lot easier.

I'm hoping when I fix the image problem that all
that 7.056 +/- 5 khz energy is going to at least be
diminished. 7.056 is S5. 7.051/7.061 are S3.

Anyway, I have no doubt the problem is my error. I
just want a little direction so that I can minimize
stress on the board.

Eric
KE6US
www.ke6us.com


????? ?????
__________________________________
Yahoo! Mail - PC Magazine Editors' Choice 2005

John
K7SVV

__________________________________________________
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Good Morning Group,

I have sent the following to a number of hams having the same
problem mentioned by serveral in the group. Every SoftRock I have
built (30+ and lost count) has worked properly, some with extra
effort.

73,
Tony KB9YIG

Not being able to null the image has usually been associated with
the I and
Q signals being crossed or one missing. Check to make sure the
stereo cable
is connected to the board with the stereo connector tip to C18, the
via
nearest the corner board mounting hole. Check with a meter to make
sure
there is nothing to short one of the I or Q signals to ground.
Also, if the QSD circuit
is not getting one of the clock phases, open at a IC pin or short
between
pins, it can result an unbalance between the I and Q signals such
that one can not get a null. Solder bridges between IC pins can
be hard to see without looking with good lighting and magnification.

The voltage gain from RF in to I or Q audio outputs is on the order
of 40-45 v/v.

--- In softrock40@..., John <digi9345@y...> wrote:

Eric,
It sounds as though you and I are in the same predicament.

The SR40 is working pretty good but the image rejection controls
have no affect. Be sure to let us know if you come up with a fix.

John [K7SVV]

EricJ <eric_ke6us@y...> wrote:
The radio went together fairly easily, though I'm at
a loss to figure out why an experimenter's radio is
jammed onto such a small board. This might be OK for
a production rig, but some room would be nice to
experiment.

That said, the radio works except there is no image
rejection and the DSP image rejection controls do
nothing. The instructions say, "If the image cannot
be nulled at least 50 db, then a problem exists..."
Well, some guidance would have been helpful.
Especially, given my opening criticism.

I am reluctant to tear into this think quite yet as
there is not a lot of room to work. I originally
thought it may be a transformer mis-wiring on my part.

Again, we're talking an experimenter's radio on 40
meters where things are relatively less critical than
other bands, so a little larger toroid with more room
to make changes would make it a lot easier.

I'm hoping when I fix the image problem that all
that 7.056 +/- 5 khz energy is going to at least be
diminished. 7.056 is S5. 7.051/7.061 are S3.

Anyway, I have no doubt the problem is my error. I
just want a little direction so that I can minimize
stress on the board.

Eric
KE6US
www.ke6us.com



__________________________________
Yahoo! Mail - PC Magazine Editors' Choice 2005



SPONSORED LINKS
Shortwave receivers Ham radio

---------------------------------
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Visit your group "softrock40" on the web.

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---------------------------------




John
K7SVV
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around

Good Morning Group,

I have sent the following to a number of hams having the same
problem mentioned by serveral in the group. Every SoftRock I have
built (30+ and lost count) has worked properly, some with extra
effort.

73,
Tony KB9YIG

Not being able to null the image has usually been associated with
the I and
Q signals being crossed or one missing. Check to make sure the
stereo cable
is connected to the board with the stereo connector tip to C18, the
via
nearest the corner board mounting hole. Check with a meter to make
sure
there is nothing to short one of the I or Q signals to ground.
Also, if the QSD circuit
is not getting one of the clock phases, open at a IC pin or short
between
pins, it can result an unbalance between the I and Q signals such
that one can not get a null. Solder bridges between IC pins can
be hard to see without looking with good lighting and magnification.

The voltage gain from RF in to I or Q audio outputs is on the order
of 40-45 v/v.

--- In softrock40@..., John <digi9345@y...> wrote:

Eric,
It sounds as though you and I are in the same predicament.

The SR40 is working pretty good but the image rejection controls
have no affect. Be sure to let us know if you come up with a fix.

John [K7SVV]

EricJ <eric_ke6us@y...> wrote:
The radio went together fairly easily, though I'm at
a loss to figure out why an experimenter's radio is
jammed onto such a small board. This might be OK for
a production rig, but some room would be nice to
experiment.

That said, the radio works except there is no image
rejection and the DSP image rejection controls do
nothing. The instructions say, "If the image cannot
be nulled at least 50 db, then a problem exists..."
Well, some guidance would have been helpful.
Especially, given my opening criticism.

I am reluctant to tear into this think quite yet as
there is not a lot of room to work. I originally
thought it may be a transformer mis-wiring on my part.

Again, we're talking an experimenter's radio on 40
meters where things are relatively less critical than
other bands, so a little larger toroid with more room
to make changes would make it a lot easier.

I'm hoping when I fix the image problem that all
that 7.056 +/- 5 khz energy is going to at least be
diminished. 7.056 is S5. 7.051/7.061 are S3.

Anyway, I have no doubt the problem is my error. I
just want a little direction so that I can minimize
stress on the board.

Eric
KE6US
www.ke6us.com



__________________________________
Yahoo! Mail - PC Magazine Editors' Choice 2005



SPONSORED LINKS
Shortwave receivers Ham radio

---------------------------------
YAHOO! GROUPS LINKS


Visit your group "softrock40" on the web.

To unsubscribe from this group, send an email to:
softrock40-unsubscribe@...

Your use of Yahoo! Groups is subject to the Yahoo! Terms of

Service.

---------------------------------




John
K7SVV
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around