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Re: carrirer oscillator

kd5nwa
 

The audio out of the I and Q signals have a 24KHz bandwidth, but their relationship tell the PC if the signal is above or below the quadrature clock. Those two signals together represent a 48 KHz swath of radio signals. Not each having 24KHz of the spectrum, but together they have 48KHz.

The PC is able to "put" a phoney carrier anywhere in that 48KHz space so that the signal is demodulated correctly into audio.

But whether you have a crystal that is low or one that is high, it makes no difference as long as the signal is in the band-pass, you still need USB and LSB demodulation. That crystal just sets the center of the frequency range that you are looking at.

It's kind like looking at book but you have a piece of cardboard with a rectangle cut in it, as you move that piece of cardboard you see different parts of the book. A word may be on the right side of the rectangle but when you move the cardboard its on the left side now, but the letters don't reverse do they? The signals just move their position in the frequency spectrum as you move the crystal frequency, you still need USB and LSB decoders.

Somebody else feel free to try to explain how it works. There are plenty of people on this list that are more knowledgeable than I am.

If you shift the desired signal up or down in freq you would need to
shift it back
to its natural audio freq spectrum


IF = 8330 kHz center of pass band

Suppose SSB signl .3 - 2 kHz

output IF filter 8330.3 - 8332 kHz depending on tuning
front end IF BW > 2 kHz

softrock board xtal 8352 kHz or 8318 kHz

output from board I and Q : 11.7 kHz - 10.0 kHz USB -> LSB

In order to copy the I/O signal it needs to be shifted back to .3 to
2 kHz by "mixing"

My question was what is the freq. range of this "mixing" process in
the powerSDR software,.
the computer

The same case can be made for the use of a softrock crystal of 8318
kHz In that case there would be
no side band switch.

73 Rein W6/PA0ZN

KD5NWA wrote:

The radio is simplicity itself, and it receives a band of signals
that is 48KHz wide, it has only one oscillator, the rest is faked by
the computer. The radio has two signals it puts out, I and Q that
are sampled by a sound card taking samples of both channels at a rate
of 48KHz, after the computer reads those two signals it figures out
the rest in it's program.

The SR-40 has a oscillator that is used in creating a quadrature
phased clock at the center of the band that you are interested in.
This clock is used to extract the I and Q signals in the frequency
range of interest, the detectors, injection of carrier, filtering ,
etc all the typical added on hardware of a radio is handled by the
software in the PC. This makes the radio hardware very simple,
"Elegance through simplicity" as I like to say of simple designs that
do the job well.

The main Osc. is crystal controlled and divided by 4 to generate
clocks in Quadrature to "detect" the signals in the frequency range
of interest. Some of us are trying to find the appropriate crystals
so we can move the frequency of the receiver to our area of interest.
In my case I want on to be able to look at the IF frequency range of
Kenwood HF radios, that frequency is 8.830MHz, I need some crystals a
little higher or lower than 4 times that frequency (around 35.3 MHz),
not an easy task if you are not willing to spend a lot of money on the
crystal.

At 03:20 PM 9/28/2005, you wrote:
>Hi All,
>
>Question. Does Power SDR software provide a "Variable Beat or Carrier
>Oscillator"? Perhaps 2 ?
>What is the freq range of that oscillator ( up to 48 or 96 kHz ? )
>
>73 Rein W6/PA0ZN
>
>KD5NWA wrote:
>
> > It would only let me see 6.5 KHz on one side.
> >
> > I'm going to try putting two crystals in parallel, and try to pull
> > them so I can get at least 10 KHz on either side of the IF, the
> > > crystals are cheap enough. I'll get the ones that are close to the
> > center of the IF and pull them down. I'll also buy one that is
> > 68.8KHz lower than the 4X IF frequency, just in case.
> >
> > At 01:58 PM 9/28/2005, Tony Parks wrote:
> > >Cecil,
> > >
> > >The crystal that is 17 kHz low would work well if you are meaning the
> > >crystal is 68 kHz low at its fundamental frequency. Seventeen kHz
> > low even
> > >at its fundamental frequency would still probably be ok.
> > >
> > >
> > >----- Original Message -----

Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then
beat you with experience.'



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




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--
Cecil
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: carrirer oscillator

 

I have,,, 'SomeWhere' a really good description of the Weaver ssb method. How, if at all, does that method compare with the softrock? (ok,,, I haven't seen that document in at least 6 years, but will find it before spring.)
Re: carrirer oscillator

 

If you shift the desired signal up or down in freq you would need to shift it back
to its natural audio freq spectrum


IF = 8330 kHz center of pass band

Suppose SSB signl .3 - 2 kHz

output IF filter 8330.3 - 8332 kHz depending on tuning front end IF BW > 2 kHz

softrock board xtal 8352 kHz or 8318 kHz

output from board I and Q : 11.7 kHz - 10.0 kHz USB -> LSB

In order to copy the I/O signal it needs to be shifted back to .3 to 2 kHz by "mixing"

My question was what is the freq. range of this "mixing" process in the powerSDR software,.
the computer

The same case can be made for the use of a softrock crystal of 8318 kHz In that case there would be
no side band switch.

73 Rein W6/PA0ZN

KD5NWA wrote:

The radio is simplicity itself, and it receives a band of signals
that is 48KHz wide, it has only one oscillator, the rest is faked by
the computer. The radio has two signals it puts out, I and Q that
are sampled by a sound card taking samples of both channels at a rate
of 48KHz, after the computer reads those two signals it figures out
the rest in it's program.

The SR-40 has a oscillator that is used in creating a quadrature
phased clock at the center of the band that you are interested in.
This clock is used to extract the I and Q signals in the frequency
range of interest, the detectors, injection of carrier, filtering ,
etc all the typical added on hardware of a radio is handled by the
software in the PC. This makes the radio hardware very simple,
"Elegance through simplicity" as I like to say of simple designs that
do the job well.

The main Osc. is crystal controlled and divided by 4 to generate
clocks in Quadrature to "detect" the signals in the frequency range
of interest. Some of us are trying to find the appropriate crystals
so we can move the frequency of the receiver to our area of interest.
In my case I want on to be able to look at the IF frequency range of
Kenwood HF radios, that frequency is 8.830MHz, I need some crystals a
little higher or lower than 4 times that frequency (around 35.3 MHz),
not an easy task if you are not willing to spend a lot of money on the crystal.

At 03:20 PM 9/28/2005, you wrote:
Hi All,

Question. Does Power SDR software provide a "Variable Beat or Carrier
Oscillator"? Perhaps 2 ?
What is the freq range of that oscillator ( up to 48 or 96 kHz ? )

73 Rein W6/PA0ZN

KD5NWA wrote:

It would only let me see 6.5 KHz on one side.

I'm going to try putting two crystals in parallel, and try to pull
them so I can get at least 10 KHz on either side of the IF, the
crystals are cheap enough. I'll get the ones that are close to the
center of the IF and pull them down. I'll also buy one that is
68.8KHz lower than the 4X IF frequency, just in case.

At 01:58 PM 9/28/2005, Tony Parks wrote:
Cecil,

The crystal that is 17 kHz low would work well if you are meaning the
crystal is 68 kHz low at its fundamental frequency. Seventeen kHz
low even
at its fundamental frequency would still probably be ok.


----- Original Message -----
Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then
beat you with experience.'


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

* Visit your group "softrock40
<>" on the web.
* To unsubscribe from this group, send an email to:
softrock40-unsubscribe@...
<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service <>.


------------------------------------------------------------------------
(No subject)

Tony Parks
 

Alex,

Let me correct my e-mail concerning your crystals. I wrote that the 35.304 MHz crystal should work well, and then I calculated the results for a 35.4 MHz oscillator. What I should have said is that the 35.304 MHz crystal will give you a center frequency of about 8.825 MHz. Your IF of 8.83 MHz allows a tuning range from -29 kHz to about +4 kHz and still avoids that big noise spike in the middle of the SoftRock's tuning range.

73,
Tony KB9YIG

----- Original Message -----
From: "Alex, VE3NEA" <alshovk@...>
To: <softrock40@...>
Sent: Wednesday, September 28, 2005 2:16 PM
Subject: Re: [softrock40]



I ordered two crystals, 35.208 and 35.304 KHz, from Surplus Sales of
Nebraska () about a month ago, they are saying
the crystals will arrive in a few days. The idea is to make one of those
oscillate at 8817*4 KHz and to put SR40 inside my TS-570. The 8830 KHz IF
signal will be pulled from the socket for the extra filter, and SR40 will
replace the IF/AF part of the transceiver.

What is the best way of pulling the LO frequency 36 KHz down or 60 KHz up?
Is this possible at all? If not, I will have to switch to the 96 KHz
sampling rate and use the 35.208 KHz crystal at its nominal frequency. Of
course, 96 KHz is an overkill since the bandwidth of the roofing filter in
TS-570 is 14 KHz, according to the Service Manual.

73 Alex VE3NEA






Yahoo! Groups Links
Re: carrirer oscillator

KD5NWA
 

The radio is simplicity itself, and it receives a band of signals that is 48KHz wide, it has only one oscillator, the rest is faked by the computer. The radio has two signals it puts out, I and Q that are sampled by a sound card taking samples of both channels at a rate of 48KHz, after the computer reads those two signals it figures out the rest in it's program.

The SR-40 has a oscillator that is used in creating a quadrature phased clock at the center of the band that you are interested in. This clock is used to extract the I and Q signals in the frequency range of interest, the detectors, injection of carrier, filtering , etc all the typical added on hardware of a radio is handled by the software in the PC. This makes the radio hardware very simple, "Elegance through simplicity" as I like to say of simple designs that do the job well.

The main Osc. is crystal controlled and divided by 4 to generate clocks in Quadrature to "detect" the signals in the frequency range of interest. Some of us are trying to find the appropriate crystals so we can move the frequency of the receiver to our area of interest. In my case I want on to be able to look at the IF frequency range of Kenwood HF radios, that frequency is 8.830MHz, I need some crystals a little higher or lower than 4 times that frequency (around 35.3 MHz), not an easy task if you are not willing to spend a lot of money on the crystal.

At 03:20 PM 9/28/2005, you wrote:
Hi All,

Question. Does Power SDR software provide a "Variable Beat or Carrier
Oscillator"? Perhaps 2 ?
What is the freq range of that oscillator ( up to 48 or 96 kHz ? )

73 Rein W6/PA0ZN

KD5NWA wrote:

It would only let me see 6.5 KHz on one side.

I'm going to try putting two crystals in parallel, and try to pull
them so I can get at least 10 KHz on either side of the IF, the
crystals are cheap enough. I'll get the ones that are close to the
center of the IF and pull them down. I'll also buy one that is
68.8KHz lower than the 4X IF frequency, just in case.

At 01:58 PM 9/28/2005, Tony Parks wrote:
Cecil,

The crystal that is 17 kHz low would work well if you are meaning the
crystal is 68 kHz low at its fundamental frequency. Seventeen kHz
low even
at its fundamental frequency would still probably be ok.


----- Original Message -----
Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then beat you with experience.'
(No subject)

 

Hi Tony,

Many thanks for the SoftRock kit. I have one from Round 3, and it has been working perfectly from the day I assembled it. Your comments on the crystal frequencies are appreciated. I will report my progress with the 8830KHz mod in this group, but this may take a while since I am still having fun with the unmodified version of the receiver.

73 Alex VE3NEA

Hi Alex,

Your 35.304 MHz crystal sounds just right to me. It will probably oscillate
at around 35.4 MHz in the SoftRock40 oscillator circuit. This would divide
down to 8.85 MHz and the SoftRock would then cover from 8.826 to 8.874 MHz.
This would give you IF passband tuning at your IF frequency -4 kHz to +44
kHz, more than required I would think.

The 35.208 MHz crystal would be a little low in frequency for this
application.

One ham has reported great results using the SoftRock40 with his vintage
Colins RX with a 455 kHz IF. Please let us all know how it works for you.

73,
Tony KB9YIG
Re: carrirer oscillator

 

Hi All,

Question. Does Power SDR software provide a "Variable Beat or Carrier Oscillator"? Perhaps 2 ?
What is the freq range of that oscillator ( up to 48 or 96 kHz ? )

73 Rein W6/PA0ZN

KD5NWA wrote:

It would only let me see 6.5 KHz on one side.

I'm going to try putting two crystals in parallel, and try to pull
them so I can get at least 10 KHz on either side of the IF, the
crystals are cheap enough. I'll get the ones that are close to the
center of the IF and pull them down. I'll also buy one that is
68.8KHz lower than the 4X IF frequency, just in case.

At 01:58 PM 9/28/2005, Tony Parks wrote:
Cecil,

The crystal that is 17 kHz low would work well if you are meaning the
crystal is 68 kHz low at its fundamental frequency. Seventeen kHz
low even
at its fundamental frequency would still probably be ok.


----- Original Message -----
From: "KD5NWA" <KD5NWA@...>
To: <k4oah@...>
Cc: <softrock40@...>
Sent: Wednesday, September 28, 2005 1:51 PM
Subject: [softrock40] Re: [QRP-L] (no subject)


We are in the process of backing up and punting instead. I've been
advised to move the crystal frequency of SR-40 by 12KHz on the low or
on the high side, to get away from some of the noise in the center of
the receivers band.

Not an easy job due to lack of crystals at those high frequencies, I
found one 17 KHz low, too low for my taste. I'll be checking for
something closer later when I get a break.

Any guesses as to how low could I pull a 35.328 MHz crystal? 48KHz
lower?

I kept the names of the interested parties, and will keep you posted.

Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then
beat you with experience.'


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

* Visit your group "softrock40
<>" on the web.
* To unsubscribe from this group, send an email to:
softrock40-unsubscribe@...
<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service <>.


------------------------------------------------------------------------
(No subject)

Tony Parks
 

Hi Alex,

Your 35.304 MHz crystal sounds just right to me. It will probably oscillate at around 35.4 MHz in the SoftRock40 oscillator circuit. This would divide down to 8.85 MHz and the SoftRock would then cover from 8.826 to 8.874 MHz. This would give you IF passband tuning at your IF frequency -4 kHz to +44 kHz, more than required I would think.

The 35.208 MHz crystal would be a little low in frequency for this application.

One ham has reported great results using the SoftRock40 with his vintage Colins RX with a 455 kHz IF. Please let us all know how it works for you.

73,
Tony KB9YIG

----- Original Message -----
From: "Alex, VE3NEA" <alshovk@...>
To: <softrock40@...>
Sent: Wednesday, September 28, 2005 2:16 PM
Subject: Re: [softrock40]



I ordered two crystals, 35.208 and 35.304 KHz, from Surplus Sales of
Nebraska () about a month ago, they are saying
the crystals will arrive in a few days. The idea is to make one of those
oscillate at 8817*4 KHz and to put SR40 inside my TS-570. The 8830 KHz IF
signal will be pulled from the socket for the extra filter, and SR40 will
replace the IF/AF part of the transceiver.

What is the best way of pulling the LO frequency 36 KHz down or 60 KHz up?
Is this possible at all? If not, I will have to switch to the 96 KHz
sampling rate and use the 35.208 KHz crystal at its nominal frequency. Of
course, 96 KHz is an overkill since the bandwidth of the roofing filter in
TS-570 is 14 KHz, according to the Service Manual.

73 Alex VE3NEA






Yahoo! Groups Links
Re: [QRP-L] (no subject)

KD5NWA
 

It would only let me see 6.5 KHz on one side.

I'm going to try putting two crystals in parallel, and try to pull them so I can get at least 10 KHz on either side of the IF, the crystals are cheap enough. I'll get the ones that are close to the center of the IF and pull them down. I'll also buy one that is 68.8KHz lower than the 4X IF frequency, just in case.

At 01:58 PM 9/28/2005, Tony Parks wrote:
Cecil,

The crystal that is 17 kHz low would work well if you are meaning the
crystal is 68 kHz low at its fundamental frequency. Seventeen kHz low even
at its fundamental frequency would still probably be ok.


----- Original Message -----
From: "KD5NWA" <KD5NWA@...>
To: <k4oah@...>
Cc: <softrock40@...>
Sent: Wednesday, September 28, 2005 1:51 PM
Subject: [softrock40] Re: [QRP-L] (no subject)


We are in the process of backing up and punting instead. I've been
advised to move the crystal frequency of SR-40 by 12KHz on the low or
on the high side, to get away from some of the noise in the center of
the receivers band.

Not an easy job due to lack of crystals at those high frequencies, I
found one 17 KHz low, too low for my taste. I'll be checking for
something closer later when I get a break.

Any guesses as to how low could I pull a 35.328 MHz crystal? 48KHz lower?

I kept the names of the interested parties, and will keep you posted.

Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then beat you with experience.'
(No subject)

 

I ordered two crystals, 35.208 and 35.304 KHz, from Surplus Sales of Nebraska () about a month ago, they are saying the crystals will arrive in a few days. The idea is to make one of those oscillate at 8817*4 KHz and to put SR40 inside my TS-570. The 8830 KHz IF signal will be pulled from the socket for the extra filter, and SR40 will replace the IF/AF part of the transceiver.

What is the best way of pulling the LO frequency 36 KHz down or 60 KHz up? Is this possible at all? If not, I will have to switch to the 96 KHz sampling rate and use the 35.208 KHz crystal at its nominal frequency. Of course, 96 KHz is an overkill since the bandwidth of the roofing filter in TS-570 is 14 KHz, according to the Service Manual.

73 Alex VE3NEA
Re: [QRP-L] (no subject)

Tony Parks
 

Cecil,

The crystal that is 17 kHz low would work well if you are meaning the crystal is 68 kHz low at its fundamental frequency. Seventeen kHz low even at its fundamental frequency would still probably be ok.

----- Original Message -----
From: "KD5NWA" <KD5NWA@...>
To: <k4oah@...>
Cc: <softrock40@...>
Sent: Wednesday, September 28, 2005 1:51 PM
Subject: [softrock40] Re: [QRP-L] (no subject)


We are in the process of backing up and punting instead. I've been
advised to move the crystal frequency of SR-40 by 12KHz on the low or
on the high side, to get away from some of the noise in the center of
the receivers band.

Not an easy job due to lack of crystals at those high frequencies, I
found one 17 KHz low, too low for my taste. I'll be checking for
something closer later when I get a break.

Any guesses as to how low could I pull a 35.328 MHz crystal? 48KHz lower?

I kept the names of the interested parties, and will keep you posted.


At 01:03 PM 9/28/2005, Garey Barrell wrote:
Cecil -

Please put me down for one of the 8.830 MHz units.

PayPal?

Thanks for doing this for us!

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<>



Cecil Bayona wrote:


If one or two guys/gals are interested in getting a OSC module for
8.830MHz the Kenwood panoramic output on the back of the radio, let
me know before tomorrow night and I'll include an extra module for
you for cost + shipping. I'll send a last call before sending out
the purchase order.
Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then
beat you with experience.'





Yahoo! Groups Links
Re: [QRP-L] (no subject)

KD5NWA
 

We are in the process of backing up and punting instead. I've been advised to move the crystal frequency of SR-40 by 12KHz on the low or on the high side, to get away from some of the noise in the center of the receivers band.

Not an easy job due to lack of crystals at those high frequencies, I found one 17 KHz low, too low for my taste. I'll be checking for something closer later when I get a break.

Any guesses as to how low could I pull a 35.328 MHz crystal? 48KHz lower?

I kept the names of the interested parties, and will keep you posted.

At 01:03 PM 9/28/2005, Garey Barrell wrote:
Cecil -

Please put me down for one of the 8.830 MHz units.

PayPal?

Thanks for doing this for us!

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<>



Cecil Bayona wrote:


If one or two guys/gals are interested in getting a OSC module for 8.830MHz the Kenwood panoramic output on the back of the radio, let me know before tomorrow night and I'll include an extra module for you for cost + shipping. I'll send a last call before sending out the purchase order.
Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then beat you with experience.'
(No subject)

KD5NWA
 

That is going to be tough, crystals at those frequencies are hard to come by, and if you want a custom frequency they end up costing more that the SR-40. The crystal oscillator I found it 2.2KHz on the high side of 8.830, but there are nothing affordable off by another 48KHz. A crystal is also available and with the right circuitry could be pulled "maybe" an additional 20KHz up for a total of 7.2 KHz on the high side. But that is getting pretty complicated.

There is a 35.251 crystal available, that is 17.5KHz on the low side. I'll have to think about it.

Since this is going to be a dedicated application, a DDS would be overkill and too pricey.

I started building it, I got a really nice lamp, but I've had to work late yesterday so I didn't work very much on it, this stuff is too tiny to work on it when you are tired. We have inventory at work this Friday and I've been having to work late this week. Worst case I will work on it this weekend, I'm not planning on going anywhere.

I have not received your kit yet, but I'm hoping it will be in today or tomorrow, the sound card came in pretty quick.

At 12:41 PM 9/28/2005, you wrote:
Hi Cecil,

In setting the frequency of the SoftRock to use it a a IF amp/demodulator
you will want a frequency offset. For example if you are wanting to work
with a 8.83 MHz IF then you want the SoftRock40 oscillator set to (8.83
+0.012 )*4 MHz or (8.83 -0.012)*4 MHz. This will keep you away from the
noise associated with the sound card around zero Hz and the SoftRock LO
signal. Plus it will give you some tuning range through the IF passband.

Another possibility is sub-harmonic sampling which uses a LO frequency 1/3
of the desired RF input frequency. Thus the frequency of the crystal would
be (f_desired / 3)*4 . The gain of the QSD is only down 6 dB with the
sub-harmonic sampling.

How is the build on your kit coming along and have you received the built
unit I recently sent?

73,
Tony KB9YIG

----- Original Message -----
From: "KD5NWA" <KD5NWA@...>
To: <softrock40@...>
Cc: <soft_radio@...>
Sent: Wednesday, September 28, 2005 12:28 PM
Subject: [softrock40]



For people interested in using the SR-40 for dedicated purpose, I was
nosing through the Mouser Catalog on line and they have for
reasonable prices both crystals and little 3.3Volt oscillator modules
to move the SoftRock 40 to the following useful frequencies;

3.579 MHz 80 Meter watering hole, changes to filter needed (14.318 MHz)
4.912 MHz Popular IF frequency, changes to filter needed (19.660 MHz)
8.830 MHz Kenwood IF frequency, no changes to the filter (35.328MHz)
9.0 MHz Ten-Tec and popular IF frequency, no changes to the filter (36
MHz)

Some of those frequencies come out a KHz or thereabout off the
correct frequency, but since the SR-40 can tune +- 24 KHz it comes
out in the wash.

The crystals are anywhere from $.42 to about $2, and the complete
modules are from $1.92 to $3

I'm going to get me some crystals and Osc. modules for 8.830, and
crystals for the rest, to play around with.

Nothing like a SR-40 with a TS-940sat for a front end, talk about
opposite ends of the spectrum, it will be my SR-40 that can go
everywhere with one heck of a front end, or my TS-940sat with
Panoramic display.

If one or two guys/gals are interested in getting a OSC module for
8.830MHz the Kenwood panoramic output on the back of the radio, let
me know before tomorrow night and I'll include an extra module for
you for cost + shipping. I'll send a last call before sending out the
purchase order.




Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then
beat you with experience.'






Yahoo! Groups Links









Yahoo! Groups Links



Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then beat you with experience.'
(No subject)

Tony Parks
 

Hi Cecil,

In setting the frequency of the SoftRock to use it a a IF amp/demodulator you will want a frequency offset. For example if you are wanting to work with a 8.83 MHz IF then you want the SoftRock40 oscillator set to (8.83 +0.012 )*4 MHz or (8.83 -0.012)*4 MHz. This will keep you away from the noise associated with the sound card around zero Hz and the SoftRock LO signal. Plus it will give you some tuning range through the IF passband.

Another possibility is sub-harmonic sampling which uses a LO frequency 1/3 of the desired RF input frequency. Thus the frequency of the crystal would be (f_desired / 3)*4 . The gain of the QSD is only down 6 dB with the sub-harmonic sampling.

How is the build on your kit coming along and have you received the built unit I recently sent?

73,
Tony KB9YIG

----- Original Message -----
From: "KD5NWA" <KD5NWA@...>
To: <softrock40@...>
Cc: <soft_radio@...>
Sent: Wednesday, September 28, 2005 12:28 PM
Subject: [softrock40]



For people interested in using the SR-40 for dedicated purpose, I was
nosing through the Mouser Catalog on line and they have for
reasonable prices both crystals and little 3.3Volt oscillator modules
to move the SoftRock 40 to the following useful frequencies;

3.579 MHz 80 Meter watering hole, changes to filter needed (14.318 MHz)
4.912 MHz Popular IF frequency, changes to filter needed (19.660 MHz)
8.830 MHz Kenwood IF frequency, no changes to the filter (35.328MHz)
9.0 MHz Ten-Tec and popular IF frequency, no changes to the filter (36 MHz)

Some of those frequencies come out a KHz or thereabout off the
correct frequency, but since the SR-40 can tune +- 24 KHz it comes
out in the wash.

The crystals are anywhere from $.42 to about $2, and the complete
modules are from $1.92 to $3

I'm going to get me some crystals and Osc. modules for 8.830, and
crystals for the rest, to play around with.

Nothing like a SR-40 with a TS-940sat for a front end, talk about
opposite ends of the spectrum, it will be my SR-40 that can go
everywhere with one heck of a front end, or my TS-940sat with
Panoramic display.

If one or two guys/gals are interested in getting a OSC module for
8.830MHz the Kenwood panoramic output on the back of the radio, let
me know before tomorrow night and I'll include an extra module for
you for cost + shipping. I'll send a last call before sending out the
purchase order.




Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then
beat you with experience.'






Yahoo! Groups Links
(No subject)

KD5NWA
 

For people interested in using the SR-40 for dedicated purpose, I was nosing through the Mouser Catalog on line and they have for reasonable prices both crystals and little 3.3Volt oscillator modules to move the SoftRock 40 to the following useful frequencies;

3.579 MHz 80 Meter watering hole, changes to filter needed (14.318 MHz)
4.912 MHz Popular IF frequency, changes to filter needed (19.660 MHz)
8.830 MHz Kenwood IF frequency, no changes to the filter (35.328MHz)
9.0 MHz Ten-Tec and popular IF frequency, no changes to the filter (36 MHz)

Some of those frequencies come out a KHz or thereabout off the correct frequency, but since the SR-40 can tune +- 24 KHz it comes out in the wash.

The crystals are anywhere from $.42 to about $2, and the complete modules are from $1.92 to $3

I'm going to get me some crystals and Osc. modules for 8.830, and crystals for the rest, to play around with.

Nothing like a SR-40 with a TS-940sat for a front end, talk about opposite ends of the spectrum, it will be my SR-40 that can go everywhere with one heck of a front end, or my TS-940sat with Panoramic display.

If one or two guys/gals are interested in getting a OSC module for 8.830MHz the Kenwood panoramic output on the back of the radio, let me know before tomorrow night and I'll include an extra module for you for cost + shipping. I'll send a last call before sending out the purchase order.




Cecil Bayona
KD5NWA
www.qrpradio.com

'Never argue with an idiot. They drag you down to their level then beat you with experience.'
Re: [QRP-L] SoftRock-40 - cat steals coil

Robert McGwier
 

Have you ever read the best seller:




Just kidding. I love my own cat but (thank goodness) she hates my work bench.

Bob

Leon Heller wrote:

I wound the coil this morning, left it on my desk, and then went out, meaning to solder it in place when I got back. When I returned it had disappeared. Babbage, my Burmese cat, had obviously come across it and, as he usually does with small objects he hasn't seen before, had been playing with it and left it somewhere. I spent several minutes searching for it (the carpets are red, which doesn't help) and had just resigned myself to winding another one (I've got a good selection of cores) when I thought I'd check the stairs and found it about half-way down. 8-)

73, Leon
--
Leon Heller, G1HSM
leon.heller@...

---
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SoftRock-40 - cat steals coil

Leon Heller
 

I wound the coil this morning, left it on my desk, and then went out, meaning to solder it in place when I got back. When I returned it had disappeared. Babbage, my Burmese cat, had obviously come across it and, as he usually does with small objects he hasn't seen before, had been playing with it and left it somewhere. I spent several minutes searching for it (the carpets are red, which doesn't help) and had just resigned myself to winding another one (I've got a good selection of cores) when I thought I'd check the stairs and found it about half-way down. 8-)

73, Leon
--
Leon Heller, G1HSM
leon.heller@...


---
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currently using to read this email. ]
Re: SoftRock-40 arrives in Europe

n6lyt
 

Hi Leon,
mine also arrived here in the UK on Monday. Put it together last
night and all is working fine ;-)
Regards,
John g0orx/n6lyt

--- In softrock40@..., "Leon Heller" <leon.heller@b...> wrote:
My SoftRock-40 kit has just materialised, here in the UK. 8-)

73, Leon
--
Leon Heller, G1HSM
leon.heller@b...
Re: [soft_radio] SR-40

kd5nwa
 

I put the lamp from Harbor Freight on my workbench, and I highly recommend it, I can now see the board and the parts clear as could be. The lamp is a circular florescent and the illumination is nice and even with no glare or shadows. If you are 40+ or have vision problems I highly recommend it, I had another lamp from Lowes with an incandescent light bulb and the difference between them is incredible. It cost $27 and it's worth every penny.

Disclaimer: I own the lamp company and want you to buy it so I can retire as a rich pig in Tahiti, and if you believe that, I also sell bridges and have a real good deal on one in Manhattan .

Today I went shopping for a fine pair of tweezers and a
light/magnifier glass for building the SR-40. I looked here, I look
there, nothing worth spending $1 on, until someone sent me to Hobby
Lobby, I struck out there too.

As I exited the building across the parking lot I saw something that
I had not seen before , it made me take a good hard look to make sure
I wasn't dreaming it up. A Harbor Freight Store, I was not aware
there was one. Apparently they were recently added to a manufacturers
mall just outside of town (5 minutes drive).

I immediately checked them out and lo an behold really fine tweezers
for a reasonable price, and a nice looking lamp, and ... $90 later I
left the place before I could go broke. They also informed me they
would match any Internet price or catalog price. I took their sale
catalog for this weekend's sidewalk sale. Huh, three iron skillets
for $9.99, I need some of those too.

It keeps getting better, when I got home, there was my order from the
AMQRP club , after supper it's time to mount the light on my
worktable and see if I can work with those darned tiny parts.

Some days are good, some days are so so, today was a good day.


--
Cecil
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



--
Cecil
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 ...
SR-40

kd5nwa
 

Today I went shopping for a fine pair of tweezers and a light/magnifier glass for building the SR-40. I looked here, I look there, nothing worth spending $1 on, until someone sent me to Hobby Lobby, I struck out there too.

As I exited the building across the parking lot I saw something that I had not seen before , it made me take a good hard look to make sure I wasn't dreaming it up. A Harbor Freight Store, I was not aware there was one. Apparently they were recently added to a manufacturers mall just outside of town (5 minutes drive).

I immediately checked them out and lo an behold really fine tweezers for a reasonable price, and a nice looking lamp, and ... $90 later I left the place before I could go broke. They also informed me they would match any Internet price or catalog price. I took their sale catalog for this weekend's sidewalk sale. Huh, three iron skillets for $9.99, I need some of those too.

It keeps getting better, when I got home, there was my order from the AMQRP club , after supper it's time to mount the light on my worktable and see if I can work with those darned tiny parts.

Some days are good, some days are so so, today was a good day.


--
Cecil
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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