Date   
Re: MSOP vs SSOP

Yaya
 

Hello Yan,

I looked at this datasheet

http://www.analog.com/static/imported-files/data_sheets/SSM2167.pdf

Look at page 11 the dimensions diagram.
You can make your own adapter for an MSOP, just get a small pcb, cover it with spray paint and let dry. I use light grey normally. Once the paint is dry just draw the layout of the copper tracks and using a thick needle or a sharpened nail scratch the paint off where it is not needed (ie between the copper traces) then etch and voila, you have an MSOP adapter!

73's Elia

--- In BITX20@..., Yannick DEVOS <yannick.devos@...> wrote:

Hi Elia,

Thanks for your answer.
I read the datasheet many times and was unable to find the picth.
Looking on internet I only found 0,65mm for MSOP, but that's true my chip seem narrower that the one I just soldered for the Si570 controller.

I will have to find another way to use this chip...
MSOP adapters are harder to find and more expensive.

73,
Yan.
---
Yannick DEVOS - XV4TUJ
http://capheda.wordpress.com/
http://www.qsl.net/xv4tuj/

Le 26 mai 2010 à 00:07, 2E0ZHN a écrit :

Hi Yannick,

The MSOP pitch is usually 0.65mm or 0.5mm where as SSOP is 0.65mm or 1.27mm. Looking at the data sheet for the SSM2167 it says a pitch of 0.5mm which means unfortunately it will not fit in a SSOP adapter.

73's Elia, 2E0ZHN

--- In BITX20@..., Yannick DEVOS <yannick.devos@> wrote:

Hi.

I already asked this question on another group but since nobody seems to know, I give it a try here...

Do you know if a MSOP part will fit in a SSOP prototyping adapter ?

I received a SSM2167 (mike pre-amp + compressor) for my BitX.
Before having the chip in hands, I though I should be able to build an adapter by myself but now I am a bit afraid of damaging the chip.
My parts provider (Futurlec) only sells SSOP to DIL adapters.
The pin pitch seems the same (0,065 mm).

Thanks by advance for your help.
73,
Yan.
---
Yannick DEVOS - XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)


[Non-text portions of this message have been removed]

Re: MSOP vs SSOP

Yannick DEVOS <yannick.devos@...>
 

Hi Elia,

Thanks for your answer.
I read the datasheet many times and was unable to find the picth.
Looking on internet I only found 0,65mm for MSOP, but that's true my chip seem narrower that the one I just soldered for the Si570 controller.

I will have to find another way to use this chip...
MSOP adapters are harder to find and more expensive.

73,
Yan.
---
Yannick DEVOS - XV4TUJ
http://capheda.wordpress.com/
http://www.qsl.net/xv4tuj/

Le 26 mai 2010 00:07, 2E0ZHN a crit :

Hi Yannick,

The MSOP pitch is usually 0.65mm or 0.5mm where as SSOP is 0.65mm or 1.27mm. Looking at the data sheet for the SSM2167 it says a pitch of 0.5mm which means unfortunately it will not fit in a SSOP adapter.

73's Elia, 2E0ZHN

--- In BITX20@..., Yannick DEVOS <yannick.devos@...> wrote:

Hi.

I already asked this question on another group but since nobody seems to know, I give it a try here...

Do you know if a MSOP part will fit in a SSOP prototyping adapter ?

I received a SSM2167 (mike pre-amp + compressor) for my BitX.
Before having the chip in hands, I though I should be able to build an adapter by myself but now I am a bit afraid of damaging the chip.
My parts provider (Futurlec) only sells SSOP to DIL adapters.
The pin pitch seems the same (0,065 mm).

Thanks by advance for your help.
73,
Yan.
---
Yannick DEVOS - XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)


[Non-text portions of this message have been removed]

Re: AGC and S-meter for the BITX20 (from Hendrickx-kits)

martienrijssemus <sproet01@...>
 

Hi Joel,

Any simple mA or uA meter will work, but I think the maximum allowable current should be around 10mA. When you want to use the 100uA meter you might need to enlarge the 100k trimmer resisitor to 250k or, alternatively, add a 47K resistor in series with your meter. I used an old VU meter from a taperecorder simply because it was in my junkbox

73
Martien

--- In BITX20@..., "jtrenalone" <jtrenalone@...> wrote:

Thanks Again Martien,
One more (I think?) question. The meter used for the S-Meter should be connected to an ammeter? I am look for a cheap (or scrap) meter that will work, but want to make sure that I get the correct one. I am looking at cheap 100 ua ammeters with a hole case mount and that are small,
Thanks,
Joel

--- In BITX20@..., "martienrijssemus" <sproet01@> wrote:

Hi Joel,

The value is 3k9 or 3900 Ohm. Sorry for my handwriting I admit it looks a bit like 3kg :-)

73's

Martien PA4H

--- In BITX20@..., "jtrenalone" <jtrenalone@> wrote:

Martien,
Thanks. I am looking at your schematic for the S-meter, and cannot read the resistor value comping off of the +13.8v. It looks like 3kg?
Thanks,
Joel

--- In BITX20@..., "martienrijssemus" <sproet01@> wrote:

Hi Joel,

I guess you are referring to R1 and R14, those are both variable resistors (trimming pot's). R14 is set for comfortable audiolevel, R1 sets the AGC. Just start halfway and allign them both for comfortable listening. By the way: I also added the schematics for an S-meter to go with this AGC circuit. You can find it in the file section: S-meter amp.pdf

73's

Martien

--- In BITX20@..., "jtrenalone" <jtrenalone@> wrote:


Thank You for the reply Martien,
One more quick questions.

The AGC schematic shows what looks like a pre-set resistor at the input and output (a flat line on the side of the resistor).

Does it have a preset or variable resistor at these points? If so, will a veriable resistor work? Or can this be a fixed value resistor?

Again, my inexperianced questions,
Thanks again,
Joel

--- In BITX20@..., "martienrijssemus" <sproet01@> wrote:

Hi Joel,

Yes, that is correct.

73's

Martien PA4H

--- In BITX20@..., "jtrenalone" <jtrenalone@> wrote:

Hello,
I have been reading this post over, and want to ensure that I have it correct.

I am building this AGC for the BITX20A.


Just to be clear (I am still new at home build), I would cut the wire between the volume pot R80 and C81 and insert the AGC. Looking at the schematic (audioagc.jpg by martien), the "From pre-amp" side would be at the C81 side, and the "To Speaker-amp" at the R80 volume control side.

Is this correct?

Thanks,
Joel

--- In BITX20@..., "Martien" <sproet01@> wrote:

--- In BITX20@..., "k5xrf" <k5xrf@> wrote:

Hi Jon,
Between C81 and and the volume potmeter (I think its R80) would be a good spot.

73's

Martien PA4H

Re: smdBITX DDS VFO Introduction

ajparent1 <kb1gmx@...>
 

--- In BITX20@..., Henrique Brancher Grvina <henrique.gravina@...> wrote:

If it's the only device the i2C address is the same.
Why should it change??
The i2c address is from the part number at bought time, when reseller bough he ask for an Address. Different resellers could not ask for the same address.
There is a standard default cmos part that SI makes with
a default address. Most rarely use other than that unless
the application is custom. Some of the non cmos parts
especially the UHF version are almost semicustom. In the I2C
interface world this is not so unusual.

The AD9850 is an Ebay item at this time! Any one can bought!

Explain that one please? It's adequately accurate as supplied
and there is a calibration procedure if you need better. The
AD9850 accuracy is only as good as the reference source though
any error can be compensated for just like the Si570.
In my tests, a release that, if you send, for example 28.455.123Hz the Si570 could give you 28.455.130 or 120. And get worst with higher frequencies.
Mine do 1hz steps to over 160mhz. It may be the software used
to communicate with the part had an error (bug). The data sheet
for the part also says the part does 1hz resolution.

> but, keep in mind, its just my opinion, my test are total made at home with just a computer and radio.

I'd add that many commercially made ham radios only tune with
10hz steps as the fine tune rate so it's not severe.

However the clifton labs site has tested this, they don't sell it.

These people sell a very nice kit with a display.
http://www.qsl.net/k5bcq/Kits/Kits.html

And this gentleman understands the part well.
http://www.qsl.net/k5bcq/Kits/G3VBV.html

But the worst thing is the Si570 is a clock generator, with square wave, so a lot of harmonics...
The UHF versions are also for the cell and other communications
use apparently as they cover those ranges to 1.4ghz.

Yes, and also correctable. To use it with a DBM you first need to lower the output as it's a bit too strong (+14DBM) and then run the result through a low pass filter.
I have two of them in use and may use more of them. One as a general signal source from below 10mhz through 180mhz. The other is part of a radio and it's far easier to use than AD9850 which I have used.
I agree that the Si570 is easier to use, but an LPF for each band look like more complex to me then a AD9850 circuit.
The LPF filters would be simple though switching them may be
added work. An alternate solution is to use a mixer that
tolerates or prefers a square wave. Many of the FET or CMOS
switch based (Tayloe for example) mixers that is the preferred waveform.

For less critical applications add some attenuation and a DBM performs well with a square wave drive. I've tried this and
it was very good.

http://www.midnightdesignsolutions.com/dds60/index.html
That uses the later and somewhat better AD9851 and that is not
the same as the 9850. The older 9850 is ok to about 15mhz
above that the spurs are a problem. Neither are cheap and
the 9850 requires an external clock source (see DDS30).

I have used the DDS60 and have replaced the bench top version
use version with Si570. Reason for that was the needed
filtering to remove discrete spurs and lack of needed signal
level. The radio that I built using the DDS60 has one uses a
VHF PLL to clean up the spurs. The AD9851 was harder to use
and required more power. I tend to build for upper HF and
lower VHF so DDS spurs are a big problem for me. Below 30mhz
the 9851 is good enough with amplifier get enough signal
to drive DBMs.

It may come down to basic issue of what one can get.


Allison




but The 9850
is an older part and even AD has better ones.
Henrique.



[Non-text portions of this message have been removed]

Re: Freq-counter

Arv Evans
 

Hasse SM6MPA

I am glad that we could help. Hams helping other hams is a big
part of this discussion group, and what makes it educational and
so much fun.

Good luck with completing your BITX20A, and hope you work lots
of DX.

73's
Arv K7HKL
_._

On 05/24/2010 02:55 PM, Hasse wrote:

Hello all and thanks Arv and Michael for assistance.Now it works
properly and shows the exact frequency on the display.Now i will go
further in my building , and start up with the TX section.I hear many
US station just now on my BITX.
Best 73 and thanks again dear friends de sm6mpa/Hasse

Re: Freq-counter

Hasse
 

Thank you Arv and Michael !! Now it works for 100%, and i`m very happy
for your assitance.Best 73 de sm6mpa/Hasse

--- In BITX20@..., Arv Evans <arvid.evans@...> wrote:

Hasse - SM6MPA

If I am understanding this correctly, it seems that the problem may be in
getting the counter clock exactly on-frequency, instead of a problem with
the BFO versus IF filter passband.

This can be verified by simultaneously using both the BITX counter and
your ICOM 726 to measure frequency of the BFO. If they agree, then the
BITX counter clock would be matched with that of your ICOM. If not,
then one of the two counters is off-frequency and needs to be adjusted.

If the problem then comes back to being the BFO versus the IF passband
you can perform this type of BFO alignment procedure:

1. Turn the transmit level control down to zero output. This protects
the RF PA section while you are keyed up for long periods doing
measurements.

2. Unbalance the BFO mixer, key the transmitter, and measure RF
voltage (use a detector probe or oscilloscope) at the collector of
Q-10 (2nd Transmit IF Amplifier).

3. Very slowly tune the BFO across the filter passband, making and
recording measurements at 200 Hz intervals.

4. Plot these voltage measurements versus frequency on graph paper.
This will give you a fair idea of the filter shape. /

NOTE: this is a voltage graph, and not a DB chart, so it will look
rather rough. The higher voltage end is emphasized and will
over-state any ripple in the filter passband./

5. From the graph you should see two points where the voltage drops
to 1/4 what it was at top of the passband. These are the -12 db
points.

6. The BFO can be adjusted to set at the lower frequency -12 db point.
This provides adequate passage of the USB signal, and helps by
providing an additional 12 db of carrier suppression beyond that
which is provided by the balanced modulator.

7. Re-balance the BFO mixer, and re-adjust the RF PA section drive
level.

The crystal filter will probably not be exactly on 11.0 MHz. Usually
the center of it's passband is slightly lower in frequency. This is the
reason you need to adjust the BFO to position it at the lower -12 db
point. If the normal pitch of your voice is quite low, you may want
to position the VFO somewhere between -6 and -12 db on the lower
skirt of the filter passband. But, for those with normal voice pitch
the -12 db point seems to work.
*/
For the purists:/*
While random selection of 11 MHz crystals will provide an adequate
filter shape, those who want to play and to optimize their filter can
swap the crystals around until they have the best possible filter
shape (flat on top and a steep side on the lower frequency edge).
This involves making many measurements and several graphs.
It helps to number your crystals so you don't get confused with
which crystal was in what position. You can also play with the
capacitors involved in the crystal filter. C-62 and C-53 affect
transmit side impedance, and C-52 and C-89 affect receive side
impedance (there is some interaction between receive and transmit
side capacitors). Impedance mismatch causes ripple across the top
of the passband. Capacitors to ground between the crystals affect
bandwidth (increase C for less bandwidth). C-55 should always
be larger than C-54 and C-56, but not always double their values.

Those who are adding CW capability to their BITX may be interested
in that last paragraph because it shows a way to obtain narrow IF
passband by switching in additional capacitance in the crystal filter
when in CW mode. This does change the filter impedance, but for
narrow-band CW work any additional ripple across the filter top is
not as much an issue as it might be for wider bandwidth modes.

Okay...I seem to have answered more questions than you ask, but
hopefully this will provide some additional information that could
be helpful for optimizing your BITX20A, and for others who are
working on similar efforts.

Arv - K7HKL
_._




On 05/24/2010 10:51 AM, Hasse wrote:

Hello Arv !
This is a cosmetic error,but i will have the correct frequence on the
display.I cannot get 11.000Mhz with the c88(33pF) on pcb.If i resolder
it there is no problem at all to get 11 MHz,when i trim c72.BUT ! the
audio sounds terrible.I change the c88 to 22pF and the max BFO freq.
i obtained was 10.99618 MHz.The rx and audio is very good here,but than
the problem remains with wrong reading on the display.It shows 8.82Kz
to much.I have an idea to change the chrystal to 11.00382 MHz (?)
Best 73 de sm6mpa/Hasse

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, Arv
Evans <arvid.evans@> wrote:

Hasse SM6MPA

Use your Icom 726 or Atlas 210 to check the frequency of your BITX20A
BFO and it's VFO.
Then do the math to see what frequency it should be receiving.

The problem you described is usually associated with having the BFO not
properly aligned
with the crystal IF Filter. If you change the BFO frequency you need to
re-measure the BFO
with the digital display so that it will compensate for that change.

Arv - K7HKL
_._


On 05/22/2010 03:31 PM, Hasse wrote:

Hi there !
Now i`m ready with the RX part of the BITX20A kit, and i have
assembled
and connected the freq-counter to the kit.(to Q6 via 22pF).I have very
good rescieving signals, thats not the problem,the problem is that
the
counter shows 5KHz to much.On my icom726, and Atlas 210 the station
was on 14.285 , but my BITX shows 14.290.In what mode can i use the
trim-cap (the green one) on the freqcounter-pcb ?It seems to have no
effect at all when i adjust it.Any ideas on the forum ?
best 73 de sm6mpa/Hasse


[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Re: smdBITX DDS VFO Introduction

Henrique Brancher Grvina <henrique.gravina@...>
 

If it's the only device the i2C address is the same.
Why should it change??
The i2c address is from the part number at bought time, when reseller bough he ask for an Address. Different resellers could not ask for the same address.
The AD9850 is an Ebay item at this time! Any one can bought!

Explain that one please? It's adequately accurate as supplied
and there is a calibration procedure if you need better. The
AD9850 accuracy is only as good as the reference source though
any error can be compensated for just like the Si570.
In my tests, a release that, if you send, for example 28.455.123Hz the Si570 could give you 28.455.130 or 120. And get worst with higher frequencies.
but, keep in mind, its just my opinion, my test are total made at home with just a computer and radio.

But the worst thing is the Si570 is a clock generator, with square wave, so a lot of harmonics...
Yes, and also correctable. To use it with a DBM you first need to lower the output as it's a bit too strong (+14DBM) and then run the result through a low pass filter.
I have two of them in use and may use more of them. One as a general signal source from below 10mhz through 180mhz. The other is part of a radio and it's far easier to use than AD9850 which I have used.
I agree that the Si570 is easier to use, but an LPF for each band look like more complex to me then a AD9850 circuit.
http://www.midnightdesignsolutions.com/dds60/index.html


Henrique.

Freq-counter

Hasse
 

Hello all and thanks Arv and Michael for assistance.Now it works
properly and shows the exact frequency on the display.Now i will go
further in my building , and start up with the TX section.I hear many
US station just now on my BITX.
Best 73 and thanks again dear friends de sm6mpa/Hasse

smdBITX Remaining Orders

Yaya
 

Hi All,

Now that all orders that have been paid for are shipped I ask the remaining few order owners to re-confirm if you are still interested.

There are nine such kits reserved for now, please check the Rev5 update in my folder in the files section, there is no date against those kits. If you still want them let me know please, if not then they will be offered to whoever else is interested.

I also have some bare PCB's left.

73's Elia, 2E0ZHN

Re: smdBITX DDS VFO Introduction

Yannick DEVOS <yannick.devos@...>
 

Hi Farhan, Elia,

I confirm Si570 as local oscillator for the VFO is really good.
Last saturday, propagation was poor but I was receiving ZS6CYY around 52 and W6CCP around 53 (he is normally a loud 57 at least).
I was using my Yaesu FT-100 and my 40m delta loop. The FT-100 is quite sensitive and is considered as a quiet receiver, the delta loop is also a quiet antenna.
I switch on my Bitx version 3 with Si570 VFO and the receiving was even better! I have no s-meter but the sound was clearer, with less noise.

By the way This also confirmed me that my bad modulation on TX is not coming from the crystal filter or the VFO.
Perhaps it is a problem on my power supply being undersized.
I will also try to add some ferrite on the power cables and AF cables...

Regarding the BPF, here is a site VU2POP gave me about SDR : http://www.wb6dhw.com/For_Sale.html#BPF
Among the kits there is this Band Pass Filter that could be interesting...

Thanks Farhan indeed for the great design you gave us, and thanks Raul, Dan, Arv, Doug, Elia and other for having contributed to make the Bitx a real international star on the QRP scene.

73,
Yan.
---
Yannick DEVOS - XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)

Le 25 mai 2010 à 13:48, Ashhar Farhan a écrit :

why not use the Si570 instead of a DDS?
- farhan

On Tue, May 25, 2010 at 6:28 AM, 2E0ZHN <eliamady@...> wrote:



Hi All,

With the kits now on their way I turn my attention to the DDS VFO and BPF Filters. This is still in the early stages of development but here are the features I aim to have:

- Coverage for 160m to 6m bands
- User defined IF
- Switching of BPF and LPF
- USB, LSB and CW mode switching
- RIT
- S-Meter
- SWR and Power Meter
- VFO A and VFO B

Once I achieve the above I may try to add the following:
- VFO function turning this into a signal generator
- Sweeper function with a Ramp output

Will keep you posted of my progress.

73's Elia, 2E0ZHN


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

Yahoo! Groups Links


Re: MSOP vs SSOP

Yaya
 

Hi Yannick,

The MSOP pitch is usually 0.65mm or 0.5mm where as SSOP is 0.65mm or 1.27mm. Looking at the data sheet for the SSM2167 it says a pitch of 0.5mm which means unfortunately it will not fit in a SSOP adapter.

73's Elia, 2E0ZHN

--- In BITX20@..., Yannick DEVOS <yannick.devos@...> wrote:

Hi.

I already asked this question on another group but since nobody seems to know, I give it a try here...

Do you know if a MSOP part will fit in a SSOP prototyping adapter ?

I received a SSM2167 (mike pre-amp + compressor) for my BitX.
Before having the chip in hands, I though I should be able to build an adapter by myself but now I am a bit afraid of damaging the chip.
My parts provider (Futurlec) only sells SSOP to DIL adapters.
The pin pitch seems the same (0,065 mm).

Thanks by advance for your help.
73,
Yan.
---
Yannick DEVOS - XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)

Re: Freq-counter

Hasse
 

Thank you ,both Arv and Michael, for your assistance with my frq-counter.Now it works 100% and now i will go further to the TX-part.
best 73 de sm6mpa/Hasse

--- In BITX20@..., Arv Evans <arvid.evans@...> wrote:

Hasse - SM6MPA

If I am understanding this correctly, it seems that the problem may be in
getting the counter clock exactly on-frequency, instead of a problem with
the BFO versus IF filter passband.

This can be verified by simultaneously using both the BITX counter and
your ICOM 726 to measure frequency of the BFO. If they agree, then the
BITX counter clock would be matched with that of your ICOM. If not,
then one of the two counters is off-frequency and needs to be adjusted.

If the problem then comes back to being the BFO versus the IF passband
you can perform this type of BFO alignment procedure:

1. Turn the transmit level control down to zero output. This protects
the RF PA section while you are keyed up for long periods doing
measurements.

2. Unbalance the BFO mixer, key the transmitter, and measure RF
voltage (use a detector probe or oscilloscope) at the collector of
Q-10 (2nd Transmit IF Amplifier).

3. Very slowly tune the BFO across the filter passband, making and
recording measurements at 200 Hz intervals.

4. Plot these voltage measurements versus frequency on graph paper.
This will give you a fair idea of the filter shape. /

NOTE: this is a voltage graph, and not a DB chart, so it will look
rather rough. The higher voltage end is emphasized and will
over-state any ripple in the filter passband./

5. From the graph you should see two points where the voltage drops
to 1/4 what it was at top of the passband. These are the -12 db
points.

6. The BFO can be adjusted to set at the lower frequency -12 db point.
This provides adequate passage of the USB signal, and helps by
providing an additional 12 db of carrier suppression beyond that
which is provided by the balanced modulator.

7. Re-balance the BFO mixer, and re-adjust the RF PA section drive
level.

The crystal filter will probably not be exactly on 11.0 MHz. Usually
the center of it's passband is slightly lower in frequency. This is the
reason you need to adjust the BFO to position it at the lower -12 db
point. If the normal pitch of your voice is quite low, you may want
to position the VFO somewhere between -6 and -12 db on the lower
skirt of the filter passband. But, for those with normal voice pitch
the -12 db point seems to work.
*/
For the purists:/*
While random selection of 11 MHz crystals will provide an adequate
filter shape, those who want to play and to optimize their filter can
swap the crystals around until they have the best possible filter
shape (flat on top and a steep side on the lower frequency edge).
This involves making many measurements and several graphs.
It helps to number your crystals so you don't get confused with
which crystal was in what position. You can also play with the
capacitors involved in the crystal filter. C-62 and C-53 affect
transmit side impedance, and C-52 and C-89 affect receive side
impedance (there is some interaction between receive and transmit
side capacitors). Impedance mismatch causes ripple across the top
of the passband. Capacitors to ground between the crystals affect
bandwidth (increase C for less bandwidth). C-55 should always
be larger than C-54 and C-56, but not always double their values.

Those who are adding CW capability to their BITX may be interested
in that last paragraph because it shows a way to obtain narrow IF
passband by switching in additional capacitance in the crystal filter
when in CW mode. This does change the filter impedance, but for
narrow-band CW work any additional ripple across the filter top is
not as much an issue as it might be for wider bandwidth modes.

Okay...I seem to have answered more questions than you ask, but
hopefully this will provide some additional information that could
be helpful for optimizing your BITX20A, and for others who are
working on similar efforts.

Arv - K7HKL
_._




On 05/24/2010 10:51 AM, Hasse wrote:

Hello Arv !
This is a cosmetic error,but i will have the correct frequence on the
display.I cannot get 11.000Mhz with the c88(33pF) on pcb.If i resolder
it there is no problem at all to get 11 MHz,when i trim c72.BUT ! the
audio sounds terrible.I change the c88 to 22pF and the max BFO freq.
i obtained was 10.99618 MHz.The rx and audio is very good here,but than
the problem remains with wrong reading on the display.It shows 8.82Kz
to much.I have an idea to change the chrystal to 11.00382 MHz (?)
Best 73 de sm6mpa/Hasse

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, Arv
Evans <arvid.evans@> wrote:

Hasse SM6MPA

Use your Icom 726 or Atlas 210 to check the frequency of your BITX20A
BFO and it's VFO.
Then do the math to see what frequency it should be receiving.

The problem you described is usually associated with having the BFO not
properly aligned
with the crystal IF Filter. If you change the BFO frequency you need to
re-measure the BFO
with the digital display so that it will compensate for that change.

Arv - K7HKL
_._


On 05/22/2010 03:31 PM, Hasse wrote:

Hi there !
Now i`m ready with the RX part of the BITX20A kit, and i have
assembled
and connected the freq-counter to the kit.(to Q6 via 22pF).I have very
good rescieving signals, thats not the problem,the problem is that
the
counter shows 5KHz to much.On my icom726, and Atlas 210 the station
was on 14.285 , but my BITX shows 14.290.In what mode can i use the
trim-cap (the green one) on the freqcounter-pcb ?It seems to have no
effect at all when i adjust it.Any ideas on the forum ?
best 73 de sm6mpa/Hasse


[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Re: smdBITX DDS VFO Introduction

Henrique Brancher Grvina <henrique.gravina@...>
 

Elia, do you know what micro-controller you will use ?

Em 24/05/2010, às 21:58, 2E0ZHN escreveu:

Hi All,

With the kits now on their way I turn my attention to the DDS VFO and BPF Filters. This is still in the early stages of development but here are the features I aim to have:

- Coverage for 160m to 6m bands
- User defined IF
- Switching of BPF and LPF
- USB, LSB and CW mode switching
- RIT
- S-Meter
- SWR and Power Meter
- VFO A and VFO B

Once I achieve the above I may try to add the following:
- VFO function turning this into a signal generator
- Sweeper function with a Ramp output

Will keep you posted of my progress.

73's Elia, 2E0ZHN



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

Yahoo! Groups Links


Re: smdBITX DDS VFO Introduction

ajparent1 <kb1gmx@...>
 

--- In BITX20@..., Henrique Brancher Grvina <henrique.gravina@...> wrote:

just my little opinion about si570:

Si570 its a nice part but have some problems:

Its no easy to buy directly, but there is a group-buy option: http://www.softrockradio.org/si570
Parts purchase can always be a problem.

To use the same software on micro-controller we have to buy parts with the same i2c address.
If it's the only device the i2C address is the same.
Why should it change??

its not accurate as an DDS like AD9850
Explain that one please? It's adequately accurate as supplied
and there is a calibration procedure if you need better. The
AD9850 accuracy is only as good as the reference source though
any error can be compensated for just like the Si570.

Also it does not have the discrete spurs like the AD9850 which
can be strong and out of band.

For most being within 20hz (at 40m) of absolutely correct is
likely better than needed and beats a VFO by several orders of magnitude.

But the worst thing is the Si570 is a clock generator, with square wave, so a lot of harmonics...
Yes, and also correctable. To use it with a DBM you first need to lower the output as it's a bit too strong (+14DBM) and then run the result through a low pass filter.

I have two of them in use and may use more of them. One as a general signal source from below 10mhz through 180mhz. The other is part of a radio and it's far easier to use than AD9850 which I have used.

look here for a far more detailed evaluation of the K5BCQ Si570
kit.

http://www.cliftonlaboratories.com/si570_kit_from_k5bcq.htm


Allison


73!
Henrique
pu3ike

Em 25/05/2010, às 07:10, MM Ali escreveu:

availability of si570 is an issue, at least right now....

Correct me if I am wrong, and help me with the source as I am looking to
acquire a few pieces......

Best Regards

MM Ali/vu2ali

smdBITX Remaining Orders

Yaya
 

Hi All,

Now that all orders that have been paid for are shipped I ask the remaining few order owners to re-confirm if you are still interested.

There are nine such kits reserved for now, please check the Rev5 update in my folder in the files section, there is no date against those kits. If you still want them let me know please, if not then they will be offered to whoever else is interested.

I also have some bare PCB's left.

73's Elia, 2E0ZHN

Re: smdBITX DDS VFO Introduction

Henrique Brancher Grvina <henrique.gravina@...>
 

just my little opinion about si570:

Si570 its a nice part but have some problems:

Its no easy to buy directly, but there is a group-buy option: http://www.softrockradio.org/si570
To use the same software on micro-controller we have to buy parts with the same i2c address.
its not accurate as an DDS like AD9850

But the worst thing is the Si570 is a clock generator, with square wave, so a lot of harmonics...

73!
Henrique
pu3ike

Em 25/05/2010, às 07:10, MM Ali escreveu:

availability of si570 is an issue, at least right now....

Correct me if I am wrong, and help me with the source as I am looking to
acquire a few pieces......

Best Regards

MM Ali/vu2ali

Re: MSOP vs SSOP

Yaya
 

Hi Yannick,

The MSOP pitch is usually 0.65mm or 0.5mm where as SSOP is 0.65mm or 1.27mm. Looking at the data sheet for the SSM2167 it says a pitch of 0.5mm which means unfortunately it will not fit in a SSOP adapter.

73's Elia, 2E0ZHN

--- In BITX20@..., Yannick DEVOS <yannick.devos@...> wrote:

Hi.

I already asked this question on another group but since nobody seems to know, I give it a try here...

Do you know if a MSOP part will fit in a SSOP prototyping adapter ?

I received a SSM2167 (mike pre-amp + compressor) for my BitX.
Before having the chip in hands, I though I should be able to build an adapter by myself but now I am a bit afraid of damaging the chip.
My parts provider (Futurlec) only sells SSOP to DIL adapters.
The pin pitch seems the same (0,065 mm).

Thanks by advance for your help.
73,
Yan.
---
Yannick DEVOS - XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)

Re: AGC and S-meter for the BITX20 (from Hendrickx-kits)

Joel Trenalone
 

Thanks Again Martien,
One more (I think?) question. The meter used for the S-Meter should be connected to an ammeter? I am look for a cheap (or scrap) meter that will work, but want to make sure that I get the correct one. I am looking at cheap 100 ua ammeters with a hole case mount and that are small,
Thanks,
Joel

--- In BITX20@..., "martienrijssemus" <sproet01@...> wrote:

Hi Joel,

The value is 3k9 or 3900 Ohm. Sorry for my handwriting I admit it looks a bit like 3kg :-)

73's

Martien PA4H

--- In BITX20@..., "jtrenalone" <jtrenalone@> wrote:

Martien,
Thanks. I am looking at your schematic for the S-meter, and cannot read the resistor value comping off of the +13.8v. It looks like 3kg?
Thanks,
Joel

--- In BITX20@..., "martienrijssemus" <sproet01@> wrote:

Hi Joel,

I guess you are referring to R1 and R14, those are both variable resistors (trimming pot's). R14 is set for comfortable audiolevel, R1 sets the AGC. Just start halfway and allign them both for comfortable listening. By the way: I also added the schematics for an S-meter to go with this AGC circuit. You can find it in the file section: S-meter amp.pdf

73's

Martien

--- In BITX20@..., "jtrenalone" <jtrenalone@> wrote:


Thank You for the reply Martien,
One more quick questions.

The AGC schematic shows what looks like a pre-set resistor at the input and output (a flat line on the side of the resistor).

Does it have a preset or variable resistor at these points? If so, will a veriable resistor work? Or can this be a fixed value resistor?

Again, my inexperianced questions,
Thanks again,
Joel

--- In BITX20@..., "martienrijssemus" <sproet01@> wrote:

Hi Joel,

Yes, that is correct.

73's

Martien PA4H

--- In BITX20@..., "jtrenalone" <jtrenalone@> wrote:

Hello,
I have been reading this post over, and want to ensure that I have it correct.

I am building this AGC for the BITX20A.


Just to be clear (I am still new at home build), I would cut the wire between the volume pot R80 and C81 and insert the AGC. Looking at the schematic (audioagc.jpg by martien), the "From pre-amp" side would be at the C81 side, and the "To Speaker-amp" at the R80 volume control side.

Is this correct?

Thanks,
Joel

--- In BITX20@..., "Martien" <sproet01@> wrote:

--- In BITX20@..., "k5xrf" <k5xrf@> wrote:

Hi Jon,
Between C81 and and the volume potmeter (I think its R80) would be a good spot.

73's

Martien PA4H

Re: smdBITX DDS VFO Introduction

MM Ali
 

availability of si570 is an issue, at least right now....

Correct me if I am wrong, and help me with the source as I am looking to acquire a few pieces......


Best Regards



MM Ali/vu2ali

----- Original Message -----
From: "Ashhar Farhan" <farhan@...>
To: <BITX20@...>
Sent: May 25, 2010 12:18 PM
Subject: Re: [BITX20] smdBITX DDS VFO Introduction


why not use the Si570 instead of a DDS?
- farhan

On Tue, May 25, 2010 at 6:28 AM, 2E0ZHN <eliamady@...> wrote:



Hi All,

With the kits now on their way I turn my attention to the DDS VFO and BPF Filters. This is still in the early stages of development but here are the features I aim to have:

- Coverage for 160m to 6m bands
- User defined IF
- Switching of BPF and LPF
- USB, LSB and CW mode switching
- RIT
- S-Meter
- SWR and Power Meter
- VFO A and VFO B

Once I achieve the above I may try to add the following:
- VFO function turning this into a signal generator
- Sweeper function with a Ramp output

Will keep you posted of my progress.

73's Elia, 2E0ZHN


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

Yahoo! Groups Links

Re: any usa smdBITX arrivals?

Mansueto Grech
 

Hi Elia,
Thanks for the update.
73's
Mans. 9H1GB

On 05/25/2010 01:48 AM, 2E0ZHN wrote:

Dear Frank, Jerry et all,

First please accept my sincere apologies, the kits were shipped today
only as I had to go on an unplanned business trip and I only got back
to the UK yesterday. I can confirm that ALL kits are now posted and
should be with you soon (USA, Brazil & Malta all posted).

I will shortly upload an updated status file showing shipment dates
for your orders.

The good thing out of this is that in my absence I received the
remaining Molex connectors so you all should be getting a complete kit.

To the European orders, I will post the remaining connectors in the
coming day or two.

I am hoping also to place in the files section the first issue of the
manual, hopefully this weekend.

Once again my apologies for the delay, hope you find the kit to your
liking.

73's Elia, 2E0ZHN