I see three basic areas.........

1) The standalone SR-40 based unit without a "large external computer".
Similar to the "futures...." project which George mentions (and what
"made" me subscribe to the Homebrewer CD ;o). I think there are several
groups working on various implementations of something like this,
including our local AQRP group. Those 2x16 backlit displays look great.

2) Using less CPU intensive SW for DSP/Tuning like "Rocky" on an average
laptop. Since you have the screen/keyboard, use it to load DDS
frequencies and loading them in 48Khz increments is fine. May even
incorporate keyboard data entry for CW and (slap me upside the head) CW
decoding for those of us more "CW challenged". CW Tx would be
straightforward and not use the computer other than to set the DDS
frequency (offset or not) and keying functions.

3) Using the larger, more powerful desktop computers with Rocky or
PowerSDR. basically what we are doing today, but expand the SR-40 to
include a loadable DDS (48Khz band segment) and a manually tuned BPF into
the SR-40.

73 Kees K5BCQ

--------- Forwarded message ----------
From: George Heron N2APB <n2apb-2@...>
To: softrock40@..., windy10605@...
Date: Wed, 19 Oct 2005 12:11:44 -0400
Subject: Re: Fw: Re: [softrock40] v5.0 SoftRock design
Message-ID: <20051019161806.452FC1F2773@...>

That's certainly the idea. See



which is also elaborated on in a current Homebrewer Mag article.

The prototype is now much further along than either of these

descriptions indicate.



73, George N2APB





On Wed Oct 19 10:52 , windy10605@... sent:

Cont.........

The next step would be standalone DSP+ with a 2x16 backlit

display and

tuner knob with shaft encoder. The one following that has a

simple (and separate

...don't require a computer to process outgoing CW) CW Tx with

appropriate

keyer, etc

73 Kees K5BCQ

----- Forwarded Message -----

From: windy10605@...

To: softrock40@...

Date: Wed, 19 Oct 2005 10:37:23 -0500

Subject: Re: [softrock40] v5.0 SoftRock design

Message-ID: <20051019.103724.2088.11.windy10605@...>

Design list.........

What I would like to see is a

SR-40 with Rocky software (could be Power

SDR at the expense of CPU cycles)

and the following changes. Add an

AD9850 DDS with parallel port loading via

the Rocky code to set the DDS

when the frequency is selected. The method of

I/Q generation TBD. It

could be the dual LT1719s withn a phase shift network

(seems "stability"

difficult to me) or the original FFs (seems easier but

upper frequency

limited due to 4x). A tuneable BPF frontend, either several

manually

selectable BPFs (the present BPF is good for 7-11Mhz, make one

for

3-5Mhz, and 13-19Mhz) or make it manually tuneable like the

preselectors

in many of the older radios.

73 Kees K5BCQ

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.

--- In softrock40@..., windy10605@j... wrote:

Design list.........

What I would like to see is a SR-40 with Rocky software (could be

Power

SDR at the expense of CPU cycles) and the following changes. Add an
AD9850 DDS with parallel port loading via the Rocky code to set the

DDS

when the frequency is selected.

I think a much better solution for experimenters would be to define a
software interface and implement a call to a dll which would do the
hardware interface. This dll could be changed depending on the
hardware used.

Jean-Claude PJ2BVU

Checkout the AMQRP Micro 908. It contains a DSP card, a DDS board, a
processor, a tuning knob, 2 X 16 LCD and connectors for audio in/out, a keyboard,
and an RS-232 port.

Dave - WB6DHW

That's certainly the idea. See

which is also elaborated on in a current Homebrewer Mag article.
The prototype is now much further along than either of these
descriptions indicate.

73, George N2APB


On Wed Oct 19 10:52 , windy10605@... sent:

Cont.........
�
The next step would be standalone DSP+ with a 2x16 backlit

display and

tuner knob with shaft encoder. The one following that has a

simple (and separate

...don't require a computer to process outgoing CW)燙W Tx with

appropriate

keyer, etc
�
73 Kees K5BCQ
�
----- Forwarded Message -----
From: windy10605@...
To: softrock40@...
Date: Wed, 19 Oct 2005 10:37:23 -0500
Subject: Re: [softrock40] v5.0 SoftRock design
Message-ID: <20051019.103724.2088.11.windy10605@...>
燚esign list.........

What I would like to see is a
SR-40 with Rocky software (could be Power
SDR at the expense of CPU cycles)
and the following changes. Add an
AD9850 DDS with parallel port loading via
the Rocky code to set the DDS
when the frequency is selected. The method of
I/Q generation TBD. It
could be the dual LT1719s withn a phase shift network
(seems "stability"
difficult to me) or the original FFs (seems easier but
upper frequency
limited due to 4x). A tuneable BPF frontend, either several
manually
selectable BPFs (the present BPF is good for 7-11Mhz, make one
for
3-5Mhz, and 13-19Mhz) or make it manually tuneable like the
preselectors
in many of the older radios.

73 Kees K5BCQ










YAHOO! GROUPS LINKS




燰isit your group "softrock40" on the web.
�
燭o unsubscribe from this group, send an email to:
爏辞蹿迟谤辞肠办40-耻苍蝉耻产蝉肠谤颈产别蔼...
�
燳our use of Yahoo! Groups is subject to the Yahoo! Terms of

Service.

开云体育

Design list.........

What I would like to see is a SR-40 with Rocky software (could be Power
SDR at the expense of CPU cycles) and the following changes. Add an
AD9850 DDS with parallel port loading via the Rocky code to set the DDS
when the frequency is selected. The method of I/Q generation TBD. It
could be the dual LT1719s withn a phase shift network (seems "stability"
difficult to me) or the original FFs (seems easier but upper frequency
limited due to 4x). A tuneable BPF frontend, either several manually
selectable BPFs (the present BPF is good for 7-11Mhz, make one for
3-5Mhz, and 13-19Mhz) or make it manually tuneable like the preselectors
in many of the older radios.

73 Kees K5BCQ

Design list.........

What I would like to see is a SR-40 with Rocky software (could be Power
SDR at the expense of CPU cycles) and the following changes. Add an
AD9850 DDS with parallel port loading via the Rocky code to set the DDS
when the frequency is selected. The method of I/Q generation TBD. It
could be the dual LT1719s withn a phase shift network (seems "stability"
difficult to me) or the original FFs (seems easier but upper frequency
limited due to 4x). A tuneable BPF frontend, either several manually
selectable BPFs (the present BPF is good for 7-11Mhz, make one for
3-5Mhz, and 13-19Mhz) or make it manually tuneable like the preselectors
in many of the older radios.

73 Kees K5BCQ

Both the Drake R-4c and Yaesu FT-101 used switched banks of variable
caps to tune the permeability tuned inductors for each band.

Here is a discussion thread about the difficulties of designing a LF
to HF preselector:

needed.html

Here is a LW/MW/SW preselector project:


Dick Patten



--- In softrock40@..., KY1K <ky1k@p...> wrote:

I know this is OT (slightly)...sorry.

I have been looking at L/C combinations to allow LF to HF operation
of the softrock. I'd like to have my softrock tune from 100 Khz to

15 Mhz.

Making a wideband tuned circuit is a tall order though, requiring
switches to achieve the wide tuning range (stepped inductors). I'd
like avoid the switches if possible.

In the old days, we could find permeability tuned variable

inductors

that had very wide ranges. But, today, no one seems to have hear of

them.

Does anyone know of a source for permeability tuned inductors??
Hopefully small and reasonably compact.

Any other suggestions regarding wide tuning ranges?

Thanks,

Art

Hi all,

I just posted a new version of the SharpDSP Mini Console for the
SoftRock 40 to my website at:



Please see my Blog entry for 10-19-2005 for details about this release:



The default meter face supplied is not calibrated, it is included for
demonstration.

73 de Phil N8VB

AD8333 - LF - 10 MHz Dual I/Q Demodulator and Phase Shifter

Data sheet available on Analog Devices web site.

This might be the basis of a future design. (?)

Stan AK0B

Hi Tony and all

Toroids in the BPF are better than tha former inductors as maybe the
higher Q can help some the filter.

In my observation (region 1, middle-east) there are
definitly 'leakages" on double the receive frequency (and by checking
with a signal generator at 21Mhz too) and from 1/2 the freq too. In the
evening hours it's quite bothersom.

May be a provision (pads for a trimmer?) should be left for setting the
90 deg. ph.shift.


Definitly thrilled by the new circuit, count me in.

73 de Joe

Rocky 1.04 works with the Windows ME operating system. Prior to that
version I was getting the message about Sound Blaster Live not working
on output. It's working now. Great program, especially for those of
us that can't run PowerSDR due to ME.

Nick Brown AB0WE

Good Morning All,

There have been a number of good comments concerning the v5.0 schematic. Those comments along with my own concerns about certain things in the posted schematic have motivated me to make the following changes:

1) The present use of two of the switches in the FST3126 (U4) for a receiver mute function will change to use those two switches in parallel with the the two QSD switches to lower the signal path switch resistance. The receiver mute function will need to be done in the software. (Not a good reason, but I need to stay with the FST3126 part because I have over 1000 pieces left from a minimum order buy for v4.0 kits. Anyone need any FST3126 parts? :-) )
2) The BPF ground will connect to the antenna ground only but two vias will be provided to jumper the antenna ground to the circuit ground.
3) L21 and L22 as well as T21 will be wound on toroid cores so a kit builder may more easily adjust the BPF design and transformer turns ratio. ( I am thinking about providing a set of cores in the kit to span the HF amateur bands.)

The board layout is coming along pretty well and I will be making the above changes in the next few days. I will post a new schematic this evening, but will continue to be open to additional suggestions.

Thanks and 73,
Tony KB9YIG

Tony the phase shift network looks awful simple, how wide a frequency range can it take before it is too far out of wack.

Specially since the Rocky software is the only one at this time that compensates as needed on a frequency by frequency, within the window, everybody else has a fixed value for the whole window.

At 09:34 PM 10/18/2005, kb9yig wrote:

Good Evening All,

I have posted in the Files area a schematic of the V5.0 SoftRock. I am
working on the board layout but am quite willing to make changes that
would make the v5.0 more useful to the group.

Your comments would be appreciated.

Thanks and 73,
Tony KB9YIG







Yahoo! Groups Links









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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 ...

I think he is passing the one clock through the switch that is controlled by the other clock, I think it is to prevent overlapping clocks without using extra gates.

At 10:01 PM 10/18/2005, Lyle Johnson wrote:

Your comments would be appreciated.

I'm a little mystified by the switch control logic in the mixer.

The FST3126 data sheet indicates the control inputs are pins 1, 4, 10
and 13 and that these need logic level drive.

The logic level drive outputs from the LT1719 comparators are applied to
pins 6 and 8 which are analog ports., with the logic inputs tied to
analog signal lines.

Or, I may be reading the data sheet incorrectly

73,

Lyle KK7P





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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 ...

Hello Tony and all

Please make the antenna input floating (so the filter ground is not
connected to the rest of the ground of the RS), otherwise it is a major
groundloop noise contributor!! (at least to all that use non floating
antennas). That means using another one of the header pins.

73 de Joe

Hi Lyle,

Two of the bus switches in the pack of four are used to enable the quadrature clocks to the control lines of a two switch QSD circuit. The two switches are used to mute the RX function by stopping the QSD with its switches open. (I am looking forward to adding a third board in the stack for a transmit function and want a quick way to kill the I and Q signals to the sound card.)

73,
Tony KB9YIG

Your comments would be appreciated.

I'm a little mystified by the switch control logic in the mixer.

The FST3126 data sheet indicates the control inputs are pins 1, 4, 10 and 13 and that these need logic level drive.

The logic level drive outputs from the LT1719 comparators are applied to pins 6 and 8 which are analog ports., with the logic inputs tied to analog signal lines.

Or, I may be reading the data sheet incorrectly

73,

Lyle KK7P

Good Evening All,

I have posted in the Files area a schematic of the V5.0 SoftRock. I am
working on the board layout but am quite willing to make changes that
would make the v5.0 more useful to the group.

Your comments would be appreciated.

Thanks and 73,
Tony KB9YIG

The sound is a little better, but still not good. The input is still
reading +6db both L & R. Still reads the input as mono, the auto I Q
Balance does not work.

Oh well, guess this 24 Bit External Soundblaster just is not going to work
out. I see where Eric of Flex Radio also said that they were not able to
get this card to work properly with their Power SDR program. I plan to get
the recommended Delta card if I do order the SDR-1000.

Thanks . I will just use my on-board 16 Bit card which sounds very good.

John

Looks good Chuck. I read about a 34dB difference between the two RF
input levels. This corresponds well to the voltage ratio of 50. Also
note the baseline noise is about 30dB below 1uV RMS. This corresponds
to a MDS of less than 0.05uV and has been reported by several who have
made the measurement.

73,
Tony KB9YIG

--- In softrock40@..., Chuck Carpenter <w5usj@9...> wrote:

Got an XG-1 signal gen kit from Elecraft yesterday. Built it this

morning

and had to try it out. Two pictures are posted showing the results.

The

signals are displayed with Rocky at a 6 zoom level.

The signal level accuracy is better than +/- 2dB according to

Elecraft specs.

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