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Re: laptop SDR power up

Stan Rife
 

开云体育

??? I'll answer my own question here.....it seems to fix the problem and I am now working on the latest files as well.
?
?

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

-----Original Message-----
From: softrock40@... [mailto:softrock40@...] On Behalf Of Stan Rife
Sent: Saturday, October 08, 2005 8:39 PM
To: softrock40@...
Subject: RE: [softrock40] laptop SDR power up

??? Hmmm, is that a good fix, Tony??
?

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

-----Original Message-----
From: softrock40@... [mailto:softrock40@...] On Behalf Of Tony Parks
Sent: Saturday, October 08, 2005 6:23 AM
To: softrock40@...
Subject: Re: [softrock40] laptop SDR power up

Hi Chris,
?
Go to the PowerSDR setup book and make sure the Disable PTT box is checked on the General form.
?
73,
Tony KB9YIG
----- Original Message -----
Sent: Friday, October 07, 2005 10:52 PM
Subject: [softrock40] laptop SDR power up

One other thing.? I thought I?would test the kit with another computer just to rule out the computer's soundcard compatibility causing my problem.
My wife just bought a Sony Vaio laptop in August, and I installed Power SDR on it the same way I did on the Dell desktop.? When I open SDR all is fine, but as soon as I click the Standby button, the program powers up and then in about half a second goes back to standby.? I uninstalled and reinstalled with no luck.? Has anyone else seen this?
?
Chris
Re: laptop SDR power up

KD5NWA
 

Wow, I'm jealous, now you can quit your job and work full time for the PowerSDR for SoftRock test team!

I hear the pay is fantastic, you know how these Open Software projects are, no expenses are too much, the sky is the limit.

At 08:37 PM 10/8/2005, Stan Rife wrote:
I'm just going to run the August version, Bill, until you get it figured out. I'm having the same problem. Re-dumping the 08-17 files back in the Flex folder fixes it for me. The 20050817 runs good, no problems.


Stan Rife
W5EWA
Houston, TX
K2 S/N 4216

-----Original Message-----
From: softrock40@... [mailto:softrock40@...] On Behalf Of Bill Tracey
Sent: Saturday, October 08, 2005 12:09 AM
To: softrock40@...
Subject: Re: [softrock40] laptop SDR power up

Yes, I've seen this on the 0907 release of code when people either copy
over a prior PowerSDR.mdb, or for some other reason it the .mdb file does
not get created correctly. To try and resolve it blow away the existing
PowerSDR.mdb and restart PowerSDR -- it will drive you back thru the config
wizard.

I'd be interested to know if this clears it up for you, and if you recall
the exact steps you did that got it into this situation. I'm still trying
to run down the root cause on this one - welcome to the PowerSDR for
SoftRock test team!

Cheers,

Bill (kd5tfd)


At 10:52 PM 10/7/2005, you wrote:
One other thing. I thought I would test the kit with another computer
just to rule out the computer's soundcard compatibility causing my problem.
My wife just bought a Sony Vaio laptop in August, and I installed Power
SDR on it the same way I did on the Dell desktop. When I open SDR all is
fine, but as soon as I click the Standby button, the program powers up and
then in about half a second goes back to standby. I uninstalled and
reinstalled with no luck. Has anyone else seen this?

Chris



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I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
Re: laptop SDR power up

Stan Rife
 

开云体育

??? Hmmm, is that a good fix, Tony??
?

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

-----Original Message-----
From: softrock40@... [mailto:softrock40@...] On Behalf Of Tony Parks
Sent: Saturday, October 08, 2005 6:23 AM
To: softrock40@...
Subject: Re: [softrock40] laptop SDR power up

Hi Chris,
?
Go to the PowerSDR setup book and make sure the Disable PTT box is checked on the General form.
?
73,
Tony KB9YIG
----- Original Message -----
Sent: Friday, October 07, 2005 10:52 PM
Subject: [softrock40] laptop SDR power up

One other thing.? I thought I?would test the kit with another computer just to rule out the computer's soundcard compatibility causing my problem.
My wife just bought a Sony Vaio laptop in August, and I installed Power SDR on it the same way I did on the Dell desktop.? When I open SDR all is fine, but as soon as I click the Standby button, the program powers up and then in about half a second goes back to standby.? I uninstalled and reinstalled with no luck.? Has anyone else seen this?
?
Chris
Re: laptop SDR power up

Stan Rife
 

开云体育

??? I'm just going to run the August version, Bill, until you get it figured out. I'm having the same problem. Re-dumping the 08-17 files back in the Flex folder fixes it for me. The 20050817 runs good, no problems.
?

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

-----Original Message-----
From: softrock40@... [mailto:softrock40@...] On Behalf Of Bill Tracey
Sent: Saturday, October 08, 2005 12:09 AM
To: softrock40@...
Subject: Re: [softrock40] laptop SDR power up

Yes, I've seen this on the 0907 release of code when people either copy
over a prior PowerSDR.mdb, or for some other reason it the .mdb file does
not get created correctly.? To try and resolve it blow away the existing
PowerSDR.mdb and restart PowerSDR -- it will drive you back thru the config
wizard.

I'd be interested to know if this clears it up for you, and if you recall
the exact steps you did that got it into this situation.? I'm still trying
to run down the root cause on this one - welcome to the PowerSDR for
SoftRock test team!

Cheers,

Bill (kd5tfd)


At 10:52 PM 10/7/2005, you wrote:
>One other thing.? I thought I would test the kit with another computer
>just to rule out the computer's soundcard compatibility causing my problem.
>My wife just bought a Sony Vaio laptop in August, and I installed Power
>SDR on it the same way I did on the Dell desktop.? When I open SDR all is
>fine, but as soon as I click the Standby button, the program powers up and
>then in about half a second goes back to standby.? I uninstalled and
>reinstalled with no luck.? Has anyone else seen this?
>
>Chris
Image problems

joe price
 

I'm using I2PHD software and can only null the image one one side of
zero (center) As I swing generator through zero to other side of
center the image reappears i've tried swapping I&Q channels but can only
null image on one side.

Thanks Joe WA9CGZ
Re: SoftRock Filter Sweep photos uploaded.

Bruce Beford
 

That was my plan for the next logical step, Tony. Hope to have some
interesting data tomorrow on that. I'll wind a new (standard ratio)
T1 and put it on a piece of perfboard to attach to my SR80 test
unit. Then I'll sweep the transformer attached to the QSD. (with the
LO set for 40M) I have my suspicion that perhaps the match to the
QSD impedance can be inproved with a slightly different turn ratio.
We'll see.

Stayed tuned for further developments.....

-Bruce N1RX

--- In softrock40@..., "Tony Parks" <raparks@c...> wrote:

Hi Bruce,

It would be very interesting to see what the Z input is at the
primary of T1
when the oscillator is stopped. Can you make this measurement
with the BPF
disconnected from T1? With the oscillator stopped there will
still be one
of the QSD switches made and thus one of the secondary windings
will be
loaded by 10 ohms in series with the switch resistance. This
series
combination should reflect to the primary by the square of the
turns ratio,
i.e, (13/6)squared. With the oscillator running there is still
one switch
and one 10 ohm resistor as a load on one of the secondary windings
at a
given time.

Thanks for all the work you are doing Bruce!

73,
Tony KB9YIG
Re: SoftRock Filter Sweep photos uploaded.

Tony Parks
 

Hi Bruce,

It would be very interesting to see what the Z input is at the primary of T1 when the oscillator is stopped. Can you make this measurement with the BPF disconnected from T1? With the oscillator stopped there will still be one of the QSD switches made and thus one of the secondary windings will be loaded by 10 ohms in series with the switch resistance. This series combination should reflect to the primary by the square of the turns ratio, i.e, (13/6)squared. With the oscillator running there is still one switch and one 10 ohm resistor as a load on one of the secondary windings at a given time.

Thanks for all the work you are doing Bruce!

73,
Tony KB9YIG

----- Original Message -----
From: "Bruce Beford" <bruce.beford@...>
To: <softrock40@...>
Sent: Saturday, October 08, 2005 4:47 PM
Subject: [softrock40] SoftRock Filter Sweep photos uploaded.


Hello everyone.

I have uploaded 4 new photos to the N1RX photo folder. These show
sweep results using an AmQRP Micro908 Antenna Analyzer on the
SoftRock. There are two pictures each for a SoftRock40 and for my
SoftRock80 prototype. For each unit, there is one photo for the
SoftRock under power, but with the local oscillator disabled. The
second photo for each, shows the same sweep, with the LO crystal
installed. Again, the Softrock is powered in all cases. Notice that
the local oscillator causes a big spike in the SWR curves at the LO
frequency, due to the oscillator energy that makes it out the antenna
jack. (Yes, the SoftRock DOES transmit, hi.) The SR80 graphs are from
2.5 Mhz-7.0 Mhz and the SR40 graphs are from 5.5 Mhz -14.0 Mhz. If
larger photos are desired, I can repost them to the files section
where they won't get squished down to only 400 pixels wide.

73, Bruce N1RX







Yahoo! Groups Links
SoftRock Filter Sweep photos uploaded.

Bruce Beford
 

Hello everyone.

I have uploaded 4 new photos to the N1RX photo folder. These show
sweep results using an AmQRP Micro908 Antenna Analyzer on the
SoftRock. There are two pictures each for a SoftRock40 and for my
SoftRock80 prototype. For each unit, there is one photo for the
SoftRock under power, but with the local oscillator disabled. The
second photo for each, shows the same sweep, with the LO crystal
installed. Again, the Softrock is powered in all cases. Notice that
the local oscillator causes a big spike in the SWR curves at the LO
frequency, due to the oscillator energy that makes it out the antenna
jack. (Yes, the SoftRock DOES transmit, hi.) The SR80 graphs are from
2.5 Mhz-7.0 Mhz and the SR40 graphs are from 5.5 Mhz -14.0 Mhz. If
larger photos are desired, I can repost them to the files section
where they won't get squished down to only 400 pixels wide.

73, Bruce N1RX
Re: ANTENNA INPUT CHARACTERIZATION

KY1K
 

First off, I have to apologize for sending the pdf to the list, I meant to send that by private mail to Tony. Haste makes waste. Thanks to all who didn't yell at me for sending an attachment to the list.

Tony, I checked the values of both fixed inductors, they are in the proper board locations and not reversed.

I can't check the values of C20 and C22 with the transformer in place, so I am going to pull the transformer. I'm fairly sure I didn't mess up the transformer, but the leads are hard to see once it's in place. To save time, I'll probably cut the wires to remove the transformer, then rewind the toroid.

The resistance measurements on the transformer check out OK per the directions below.

Before I reinstall the transformer, I'll check the inductance of the primary as a very small crack in the ferrite can drastically reduce the inductance.

Wish me luck....I might need it.

Art
Re: ANTENNA INPUT CHARACTERIZATION

Tony Parks
 

Hi Art,

I have copied the paragraphs below from one of my earlier postings. Problems with the transformer have been common with the SoftRock and can result in low sensitivity. I am unable to make any conclusions on your input Z measurements.

Let me know if you would like to talk through some debug on your unit.

73,
Tony Kb9YIG


Try making resistance measurements to ground at the vias of T1.
The two vias nearest to the edge of the board are the primary connections to
T1. One side of the primary is grounded and so the resistance at both vias
should be zero. All four of the remaining vias in the T1 group should have
a resistance to ground of about 7k if the windings are properly soldered.

Winding T1 results in three leads coming out one side of the core and three
leads coming out the other side of the core. Wiring T1 to the board
requires that the three leads from each side of the core go the the three
vias on each side of the T1 pattern. However, also very important is to make
sure the winding ends are properly paired up and the primary winding
connects to the via pair nearest to the board edge. Short silkscreen lines
on the T1 pattern show pairs of vias for each winding. Could it be that you
have your two secondary windings wound in opposite directions? If that were
the case then you would get almost no signal through the QSD circuit.

----- Original Message -----
From: "KY1K" <ky1k@...>
To: <softrock40@...>
Sent: Saturday, October 08, 2005 3:55 PM
Subject: Re: [softrock40] ANTENNA INPUT CHARACTERIZATION


Thanks Tony,

I'm plugging away at it, making some progress. I'm not sure if I can
evaluate the I/Q analog outputs without a sound card that has a
stereo input, which is what have at the moment. House under
construction, the primary computer and some test equipment not available.

If anything, I should call you I think. I appreciate the offer.

The antenna analyzer is available online, or I can send it to you
easily (900 KB). I'm applying the output of the unit in mode 1, which
gives swr, Xs and Rs for any frequency that the unit is set for.

Here's what I've done so far.

Characterized the antenna input for Xs, Rs and swr as shown on the
MFJ 269 antenna analyzer (at 5, 6, 7, 8 and 9 Mhz). Results given in
email message. I compared the one you built (which is now my wifes)
to the kit I just got done putting together. Your unit runs good,
mine is deaf, but has the same output voltage as mine does with no
antenna input. Like i said, they appear identical until one plugs in
an antenna.

When the antenna is connected, my unit only shows 4 db more noise on
the output, the unit you sent shows 20 db more output.

My unit can hear the MFJ oscillator at 20 db above the noise. The
same signal is 50 db above the noise on the prebuilt unit you sent.

I have confirmed that each 7408 gate has 7054 Khz on the outputs and
that those outputs are getting to the input pins of the analog switch.

I'm curious whether the electrical differences in the antenna input
are typical, or whether they are the likely source of the problem.
They seem to be quite a bit different than they should be when the
results are compared between the 2 softrocks. But, I don't have
enough experience to know if they should vary by as much as they do.

I've attached a PDF which shows the results of the input
characterization a little better, the email message came through
scrambled, not sure why.







At 04:06 PM 10/8/2005, you wrote:

Hi Art,

Not sure I understand your table of data. However, I would be happy to give
you a telepone call and see if we can track down the problem with your
SoftRock. I have worked with a number of others over the phone and I think
it has helped them a bit. If you would be interested in doing that, send me
an e-mail at raparks@... with your telephone number and what time I
should call.

73,
Tony KB9YIG

----- Original Message -----
From: "KY1K" <ky1k@...>
To: <softrock40@...>
Sent: Saturday, October 08, 2005 2:23 PM
Subject: [softrock40] ANTENNA INPUT CHARACTERIZATION


Greetings all,

As previously reported, my softrock is dead-has to be a bone
crushing+ loud signal to be heard. But, the output level to the sound
card appears identical compared with my borrowed and fully functional
softrock. By this I mean that both units put out the same signal
level to the soundcard with no antenna connected....in fact, it's
impossible to tell them apart until a decent antenna is connected.

So, I figured I had a tuned circuit problem between the antenna and
the transformer...but that the power supply, the switch and the logic
was probably working fine.

I borrowed an MFJ antenna analyzer (MFJ-269) and fed the thing into
the antenna input.

I've checked these figures twice, got the same numbers both times.

These measurements were taken on the bench with power applied from
the computer and with the connection made to the sound
card (without antenna attached). I have a fairly high degree of
confidence that the MFJ is in working order, it's used often and has
recently made stubs for 6 meters and the numbers seem reasonable when
hooked up to my 2 meter yagi.

So, here is are the results.

SWR
Rs Xs

5 Mhz 15(12) 12(15) 102(96)
6 Mhz 1.7(3.2) 77(14) 26(12)
7 Mhz 3.8(2.1) 30(24) 63(12)
8 Mhz 2.7(2.4) 113(21) 56(14)
9 Mhz 1.0(5.3) 49(11) 2(25)


Has anyone else had their softrocks hooked up to an antenna analyzer?
The numbers seem like they should be a little closer to each other,
so I'm not sure whether to look at the tuned circuit or elsewhere.
Any suggestions?

HELP!!!!!!

Art



.





Yahoo! Groups Links










Yahoo! Groups Links






Yahoo! Groups Links
Re: ANTENNA INPUT CHARACTERIZATION

KY1K
 

Hit the return button on that one a little too fast, sorry.

Anyway, I'm hoping you can shed some light on the antenna input numbers...whether you think the variance could be the problem, or is it something else I should be looking at?

I'm assuming that since I am only using a mono input computer (my laptop) that the other un-monitored output can't be part of the problem.

Since I'm getting identical output levels from the 2 units with no antenna attached, I am assuming the problem is not with the I or Q audio output IC.

Should I be looking at the input circuit as the likely cause of the problem? I did drop the toroid (hard tile floor), so there might have been some damage done to it...but it's not visible and those units are pretty rugged. I looked it over well with the magnified desk lamp, and it did not appear to have any cracks in it.

I did confirm the inductors (L1 and L2) were placed properly (by measuring them with my RCL meter), so they are probably not installed int he wrong PCB locations.

Any suggestions??

Art

At 04:06 PM 10/8/2005, you wrote:

Hi Art,

Not sure I understand your table of data. However, I would be happy to give
you a telepone call and see if we can track down the problem with your
SoftRock. I have worked with a number of others over the phone and I think
it has helped them a bit. If you would be interested in doing that, send me
an e-mail at raparks@... with your telephone number and what time I
should call.

73,
Tony KB9YIG

----- Original Message -----
From: "KY1K" <ky1k@...>
To: <softrock40@...>
Sent: Saturday, October 08, 2005 2:23 PM
Subject: [softrock40] ANTENNA INPUT CHARACTERIZATION


Greetings all,

As previously reported, my softrock is dead-has to be a bone
crushing+ loud signal to be heard. But, the output level to the sound
card appears identical compared with my borrowed and fully functional
softrock. By this I mean that both units put out the same signal
level to the soundcard with no antenna connected....in fact, it's
impossible to tell them apart until a decent antenna is connected.

So, I figured I had a tuned circuit problem between the antenna and
the transformer...but that the power supply, the switch and the logic
was probably working fine.

I borrowed an MFJ antenna analyzer (MFJ-269) and fed the thing into
the antenna input.

I've checked these figures twice, got the same numbers both times.

These measurements were taken on the bench with power applied from
the computer and with the connection made to the sound
card (without antenna attached). I have a fairly high degree of
confidence that the MFJ is in working order, it's used often and has
recently made stubs for 6 meters and the numbers seem reasonable when
hooked up to my 2 meter yagi.

So, here is are the results.

SWR
Rs Xs

5 Mhz 15(12) 12(15) 102(96)
6 Mhz 1.7(3.2) 77(14) 26(12)
7 Mhz 3.8(2.1) 30(24) 63(12)
8 Mhz 2.7(2.4) 113(21) 56(14)
9 Mhz 1.0(5.3) 49(11) 2(25)


Has anyone else had their softrocks hooked up to an antenna analyzer?
The numbers seem like they should be a little closer to each other,
so I'm not sure whether to look at the tuned circuit or elsewhere.
Any suggestions?

HELP!!!!!!

Art



.





Yahoo! Groups Links










Yahoo! Groups Links
Re: ANTENNA INPUT CHARACTERIZATION

KY1K
 

Thanks Tony,

I'm plugging away at it, making some progress. I'm not sure if I can evaluate the I/Q analog outputs without a sound card that has a stereo input, which is what have at the moment. House under construction, the primary computer and some test equipment not available.

If anything, I should call you I think. I appreciate the offer.

The antenna analyzer is available online, or I can send it to you easily (900 KB). I'm applying the output of the unit in mode 1, which gives swr, Xs and Rs for any frequency that the unit is set for.

Here's what I've done so far.

Characterized the antenna input for Xs, Rs and swr as shown on the MFJ 269 antenna analyzer (at 5, 6, 7, 8 and 9 Mhz). Results given in email message. I compared the one you built (which is now my wifes) to the kit I just got done putting together. Your unit runs good, mine is deaf, but has the same output voltage as mine does with no antenna input. Like i said, they appear identical until one plugs in an antenna.

When the antenna is connected, my unit only shows 4 db more noise on the output, the unit you sent shows 20 db more output.

My unit can hear the MFJ oscillator at 20 db above the noise. The same signal is 50 db above the noise on the prebuilt unit you sent.

I have confirmed that each 7408 gate has 7054 Khz on the outputs and that those outputs are getting to the input pins of the analog switch.

I'm curious whether the electrical differences in the antenna input are typical, or whether they are the likely source of the problem. They seem to be quite a bit different than they should be when the results are compared between the 2 softrocks. But, I don't have enough experience to know if they should vary by as much as they do.

I've attached a PDF which shows the results of the input characterization a little better, the email message came through scrambled, not sure why.

At 04:06 PM 10/8/2005, you wrote:

Hi Art,

Not sure I understand your table of data. However, I would be happy to give
you a telepone call and see if we can track down the problem with your
SoftRock. I have worked with a number of others over the phone and I think
it has helped them a bit. If you would be interested in doing that, send me
an e-mail at raparks@... with your telephone number and what time I
should call.

73,
Tony KB9YIG

----- Original Message -----
From: "KY1K" <ky1k@...>
To: <softrock40@...>
Sent: Saturday, October 08, 2005 2:23 PM
Subject: [softrock40] ANTENNA INPUT CHARACTERIZATION


Greetings all,

As previously reported, my softrock is dead-has to be a bone
crushing+ loud signal to be heard. But, the output level to the sound
card appears identical compared with my borrowed and fully functional
softrock. By this I mean that both units put out the same signal
level to the soundcard with no antenna connected....in fact, it's
impossible to tell them apart until a decent antenna is connected.

So, I figured I had a tuned circuit problem between the antenna and
the transformer...but that the power supply, the switch and the logic
was probably working fine.

I borrowed an MFJ antenna analyzer (MFJ-269) and fed the thing into
the antenna input.

I've checked these figures twice, got the same numbers both times.

These measurements were taken on the bench with power applied from
the computer and with the connection made to the sound
card (without antenna attached). I have a fairly high degree of
confidence that the MFJ is in working order, it's used often and has
recently made stubs for 6 meters and the numbers seem reasonable when
hooked up to my 2 meter yagi.

So, here is are the results.

SWR
Rs Xs

5 Mhz 15(12) 12(15) 102(96)
6 Mhz 1.7(3.2) 77(14) 26(12)
7 Mhz 3.8(2.1) 30(24) 63(12)
8 Mhz 2.7(2.4) 113(21) 56(14)
9 Mhz 1.0(5.3) 49(11) 2(25)


Has anyone else had their softrocks hooked up to an antenna analyzer?
The numbers seem like they should be a little closer to each other,
so I'm not sure whether to look at the tuned circuit or elsewhere.
Any suggestions?

HELP!!!!!!

Art



.





Yahoo! Groups Links










Yahoo! Groups Links
Re: ANTENNA INPUT CHARACTERIZATION

Tony Parks
 

Hi Art,

Not sure I understand your table of data. However, I would be happy to give you a telepone call and see if we can track down the problem with your SoftRock. I have worked with a number of others over the phone and I think it has helped them a bit. If you would be interested in doing that, send me an e-mail at raparks@... with your telephone number and what time I should call.

73,
Tony KB9YIG

----- Original Message -----
From: "KY1K" <ky1k@...>
To: <softrock40@...>
Sent: Saturday, October 08, 2005 2:23 PM
Subject: [softrock40] ANTENNA INPUT CHARACTERIZATION


Greetings all,

As previously reported, my softrock is dead-has to be a bone
crushing+ loud signal to be heard. But, the output level to the sound
card appears identical compared with my borrowed and fully functional
softrock. By this I mean that both units put out the same signal
level to the soundcard with no antenna connected....in fact, it's
impossible to tell them apart until a decent antenna is connected.

So, I figured I had a tuned circuit problem between the antenna and
the transformer...but that the power supply, the switch and the logic
was probably working fine.

I borrowed an MFJ antenna analyzer (MFJ-269) and fed the thing into
the antenna input.

I've checked these figures twice, got the same numbers both times.

These measurements were taken on the bench with power applied from
the computer and with the connection made to the sound
card (without antenna attached). I have a fairly high degree of
confidence that the MFJ is in working order, it's used often and has
recently made stubs for 6 meters and the numbers seem reasonable when
hooked up to my 2 meter yagi.

So, here is are the results.
SWR
Rs Xs

5 Mhz 15(12) 12(15) 102(96)
6 Mhz 1.7(3.2) 77(14) 26(12)
7 Mhz 3.8(2.1) 30(24) 63(12)
8 Mhz 2.7(2.4) 113(21) 56(14)
9 Mhz 1.0(5.3) 49(11) 2(25)


Has anyone else had their softrocks hooked up to an antenna analyzer?
The numbers seem like they should be a little closer to each other,
so I'm not sure whether to look at the tuned circuit or elsewhere.
Any suggestions?

HELP!!!!!!

Art



.





Yahoo! Groups Links
ANTENNA INPUT CHARACTERIZATION

KY1K
 

Greetings all,

As previously reported, my softrock is dead-has to be a bone crushing+ loud signal to be heard. But, the output level to the sound card appears identical compared with my borrowed and fully functional softrock. By this I mean that both units put out the same signal level to the soundcard with no antenna connected....in fact, it's impossible to tell them apart until a decent antenna is connected.

So, I figured I had a tuned circuit problem between the antenna and the transformer...but that the power supply, the switch and the logic was probably working fine.

I borrowed an MFJ antenna analyzer (MFJ-269) and fed the thing into the antenna input.

I've checked these figures twice, got the same numbers both times.

These measurements were taken on the bench with power applied from the computer and with the connection made to the sound card (without antenna attached). I have a fairly high degree of confidence that the MFJ is in working order, it's used often and has recently made stubs for 6 meters and the numbers seem reasonable when hooked up to my 2 meter yagi.

So, here is are the results.
SWR Rs Xs

5 Mhz 15(12) 12(15) 102(96)
6 Mhz 1.7(3.2) 77(14) 26(12)
7 Mhz 3.8(2.1) 30(24) 63(12)
8 Mhz 2.7(2.4) 113(21) 56(14)
9 Mhz 1.0(5.3) 49(11) 2(25)


Has anyone else had their softrocks hooked up to an antenna analyzer? The numbers seem like they should be a little closer to each other, so I'm not sure whether to look at the tuned circuit or elsewhere. Any suggestions?

HELP!!!!!!

Art



.
SR-40 Packaged and Running

Chuck Carpenter
 

SR-40 Folks,

The SR-40 is packaged, wired and is working thanks to some great help from folks on the lists. This thing is a great way to gain some familiarity with SDR operation.

I've updated the pictures and posted them on the Yahoo groups Softrock40 reflector.

The enclosure is an LMB CR-321. The board is mounted vertical for access (and viewing for show and tell) to both sides. The supports are L-brackets made from some aluminum angle. Had to do some trimming and insulating to clear the adjacent component pads.

The back panel includes the power connector, stereo cable jack and the BNC antenna jack. On the front panel are the LED power indicator and an ON/OFF switch. Now to try the 30 meter conversion.

The holes mounting the board were thread formed using a 4-40 screw. Don't tap the holes -- it removes the metal and the epoxy fiberglass won't hold a thread.

The LED is now panel mounted and DIP pins were used for the crystal and the two feedback capacitors for the oscillator. I used manhattan pads for the off-board connections.

I found that the use of very fine solder was much needed. The pads are small. The stuff I used is .015 silver bearing solder that I found at RS.

Tony Parks mounted the surface mount parts for me and helped get the software running. Cecil provided the info on how to do the tuning. Several things weren't intuitively obvious to this COF...[g]


Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73
50 years -|- 19 - K2OFN and 31 - W5USJ -|- Most fun = QRP since 1984.
www.w5usj.com hosted by Hamnutz.com -|- NeTxQRP www.netxqrp.com
It's working!

Chris Waldrup
 

Hi Bill, Tony and eveyone else,

I tried it with my wife's new vaio laptop and I am able to null the image
down into the noise! So it looks like my Softrock hardware is fine and it
is an issue with the Soundblaster Live card. Thanks so much to all who have
helped. I hooked up an antenna and I have signals!

Chris
Re: It's Working -- Sorta [Tuning ]

KD5NWA
 

I'm hoping to get mine working later this morning, then I will start building a second one for 8830MHz

At 08:04 AM 10/8/2005, you wrote:
Cecil,

Thanks -- that did it. Things get easier once you understand them...[g]

Much appreciated and having fun!

Going to get it calibrated now.

At 07:35 AM 10/8/2005 -0500, you wrote:
Tuning;

Put your mouse cursor in the pan-adaptor screen, right click the
mouse, it will show cross hairs on the cursor.
Put the mouse cursor on a desired signal, click with the left button,
bingo you are there.

Look at the top of the frequency display on the left side, it says 1
KHz, press the control key then while holding the control key down
press the right arrow, the display changes to 100Hz, do it one more
time, it changes to 10 Hz. Now you can use the scroll wheel in your
mouse to fine tune the signal.

I would suggest that you get it all calibrated and nulled out before
you start making changes to make sure everything is OK.


Have Fun!

At 07:14 AM 10/8/2005, Chuck Carpenter wrote:
Well, great!

Up until I saw Tony's message where he said to check Disable
PTT, it seemed
like my luck had run out. Everything built so far had worked first
time...[g]

I could hear the oscillator in my receiver and all the static
voltages were
OK. No scope to look at other stuff. Now all the controls appear to be
working.

The SR-40 isn't calibrated or properly setup yet. But when I turn on a
Rock-Mite with a crystal at 7035 I see a definite signal from the
oscillator (no antenna on RM) at that frequency on the panadapter screen.

So I'm part way there at least. I still don't hear any sound in my laptop
speakers and I haven't figured out how to tune the thing.

Next, I'll have to try the 30 meter mods using the crystal from Bruce
Beford.


Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73
50 years -|- 19 - K2OFN and 31 - W5USJ -|- Most fun = QRP since 1984.
www.w5usj.com hosted by Hamnutz.com -|- NeTxQRP www.netxqrp.com





Yahoo! Groups Links










--
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.13/124 - Release Date: 10/7/2005
Cecil Bayona
KD5NWA
www.qrpradio.com

I fail to see why doing the same thing over and over and getting the
same results every time is insanity: I've almost proved it isn't;
only a few more tests now and I'm sure results will differ this time ...





Yahoo! Groups Links





Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73
50 years -|- 19 - K2OFN and 31 - W5USJ -|- Most fun = QRP since 1984.
www.w5usj.com hosted by Hamnutz.com -|- NeTxQRP www.netxqrp.com





Yahoo! Groups Links










--
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.13/124 - Release Date: 10/7/2005
Cecil Bayona
KD5NWA
www.qrpradio.com

I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
Re: It's Working -- Sorta [Tuning ]

Chuck Carpenter
 

Cecil,

Thanks -- that did it. Things get easier once you understand them...[g]

Much appreciated and having fun!

Going to get it calibrated now.

At 07:35 AM 10/8/2005 -0500, you wrote:
Tuning;

Put your mouse cursor in the pan-adaptor screen, right click the
mouse, it will show cross hairs on the cursor.
Put the mouse cursor on a desired signal, click with the left button,
bingo you are there.

Look at the top of the frequency display on the left side, it says 1
KHz, press the control key then while holding the control key down
press the right arrow, the display changes to 100Hz, do it one more
time, it changes to 10 Hz. Now you can use the scroll wheel in your
mouse to fine tune the signal.

I would suggest that you get it all calibrated and nulled out before
you start making changes to make sure everything is OK.


Have Fun!

At 07:14 AM 10/8/2005, Chuck Carpenter wrote:
Well, great!

Up until I saw Tony's message where he said to check Disable PTT, it seemed
like my luck had run out. Everything built so far had worked first
time...[g]

I could hear the oscillator in my receiver and all the static voltages were
OK. No scope to look at other stuff. Now all the controls appear to be
working.

The SR-40 isn't calibrated or properly setup yet. But when I turn on a
Rock-Mite with a crystal at 7035 I see a definite signal from the
oscillator (no antenna on RM) at that frequency on the panadapter screen.

So I'm part way there at least. I still don't hear any sound in my laptop
speakers and I haven't figured out how to tune the thing.

Next, I'll have to try the 30 meter mods using the crystal from Bruce
Beford.


Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73
50 years -|- 19 - K2OFN and 31 - W5USJ -|- Most fun = QRP since 1984.
www.w5usj.com hosted by Hamnutz.com -|- NeTxQRP www.netxqrp.com





Yahoo! Groups Links










--
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.13/124 - Release Date: 10/7/2005
Cecil Bayona
KD5NWA
www.qrpradio.com

I fail to see why doing the same thing over and over and getting the
same results every time is insanity: I've almost proved it isn't;
only a few more tests now and I'm sure results will differ this time ...





Yahoo! Groups Links





Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73
50 years -|- 19 - K2OFN and 31 - W5USJ -|- Most fun = QRP since 1984.
www.w5usj.com hosted by Hamnutz.com -|- NeTxQRP www.netxqrp.com
Re: laptop SDR power up

Chris Waldrup
 

开云体育

Hi Tony,
?
Disable PTT wasn't checked and when I checked it that fixed this problem.? Now on to trying the SR40 on the laptop!
?
Chris

----- Original Message -----
From: Tony Parks
Sent: Saturday, October 08, 2005 7:23 AM
Subject: Re: [softrock40] laptop SDR power up

Hi Chris,
?
Go to the PowerSDR setup book and make sure the Disable PTT box is checked on the General form.
?
73,
Tony KB9YIG
----- Original Message -----
Sent: Friday, October 07, 2005 10:52 PM
Subject: [softrock40] laptop SDR power up

One other thing.? I thought I?would test the kit with another computer just to rule out the computer's soundcard compatibility causing my problem.
My wife just bought a Sony Vaio laptop in August, and I installed Power SDR on it the same way I did on the Dell desktop.? When I open SDR all is fine, but as soon as I click the Standby button, the program powers up and then in about half a second goes back to standby.? I uninstalled and reinstalled with no luck.? Has anyone else seen this?
?
Chris
Re: It's Working -- Sorta

KD5NWA
 

Tuning;

Put your mouse cursor in the pan-adaptor screen, right click the mouse, it will show cross hairs on the cursor.
Put the mouse cursor on a desired signal, click with the left button, bingo you are there.

Look at the top of the frequency display on the left side, it says 1 KHz, press the control key then while holding the control key down press the right arrow, the display changes to 100Hz, do it one more time, it changes to 10 Hz. Now you can use the scroll wheel in your mouse to fine tune the signal.

I would suggest that you get it all calibrated and nulled out before you start making changes to make sure everything is OK.


Have Fun!

At 07:14 AM 10/8/2005, Chuck Carpenter wrote:
Well, great!

Up until I saw Tony's message where he said to check Disable PTT, it seemed
like my luck had run out. Everything built so far had worked first time...[g]

I could hear the oscillator in my receiver and all the static voltages were
OK. No scope to look at other stuff. Now all the controls appear to be
working.

The SR-40 isn't calibrated or properly setup yet. But when I turn on a
Rock-Mite with a crystal at 7035 I see a definite signal from the
oscillator (no antenna on RM) at that frequency on the panadapter screen.

So I'm part way there at least. I still don't hear any sound in my laptop
speakers and I haven't figured out how to tune the thing.

Next, I'll have to try the 30 meter mods using the crystal from Bruce Beford.


Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73
50 years -|- 19 - K2OFN and 31 - W5USJ -|- Most fun = QRP since 1984.
www.w5usj.com hosted by Hamnutz.com -|- NeTxQRP www.netxqrp.com





Yahoo! Groups Links










--
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.13/124 - Release Date: 10/7/2005
Cecil Bayona
KD5NWA
www.qrpradio.com

I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
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