Re: si5351 breakout board. Does it always need a controller ?
Rob (G4NQX),
Frequency stability of the Si5351 should be excellent! It runs from a 25MHz
crystal and by means of digital wizardry can produce up to three output
signals of 3V pk to pk at any frequency between 8kHz and 160MHz.
A correction can be applied in software to allow for small variations in
individual crystal frequencies of Si5351, so frequency accuracy can also be
very good.
Don't get too bogged down by the Si5351 datasheet. It isn't a standalone
device and needs to be controlled/setup via I2C serial commands from an
Arduino or similar PIC device. It's much easier to "stand on the shoulders of
giants" as I have done.
Have a look at the the software that I posted in the Files section under the
directory named "DDS_for_BITX_Arduino_Si5351_KH". The file is an Arduino sketch
file named "DDS_for_BITX20_v_0_1_0.ino". I intend to post updated versions
soon, but this version does work OK.
"DDS_for_BITX20_v_0_1_0.ino" is based on earlier work by AK2B and others. It
provides for using an Arduino/Si5351 to control the VFO and BFO of a BITX20 or
to operate as a useful wide range signal generator. I found the latter very
helpful to determine the actual frequency response of the IF filter. Please
read the fairly extensive comments that are included in this file.
I am using this file to control both the VFO and BFO of my BITX20A. A friend is
using a modified version to control his BITX40.
Let me know if you need more info.
Regards
Ken Hough (M0KOH)
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On Tuesday 20 Oct 2015 01:15:20 you wrote: Hi all,
I have the Adafruit breakout board for the si5351 and have tried various
softwares from around the net. However none seems to answer my question, will the board hold the frequency
set? At the moment it doesn't. I see from the datasheet for the device that it has a rom which empties its
contents into ram at powerup. Do I need to write to this rom in order to get fixed frequencies generated
at startup and if so how? Seems odd to advertise the si5351 as being able to replace crystals when at
the moment it will not standalone but requires a controller. Rob G4NQX
|
si5351 breakout board. Does it always need a controller ?
Hi all, I have the Adafruit breakout board for the si5351 and have tried various softwares from around the net. However none seems to answer my question, will the board hold the frequency set?? At the moment it doesn't. I see from the datasheet for the device that it has a rom which empties its contents into ram at powerup. Do I need to write to this rom in order to get fixed frequencies generated at startup and if so how? Seems odd to advertise the si5351 as being able to replace crystals when at the moment it will not standalone but requires a controller. Rob G4NQX
|
Re: Just started building the Hendricks 17m Bitx
Thanks for the tip Leonard, 73 Colin
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Re: Just started building the Hendricks 17m Bitx
Hi Ken, thank you for your help, I will get some header and vero pins also thanks for the tip with the Arduino/SI5351 I will look into that, 73 Colin.
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Re: Just started building the Hendricks 17m Bitx
Thanks for the good idea Ron, I will get some header pins. 73 Colin
|
Did you seek the assembly manual?
? I fear specific assembly manual for 3C (SBL or ADE mixer varient- is anot needed.
?the overlay helps you.
?all other things are same
?3B assembly manual could still guide you, Ron.
|
Go to http://cqbitx.blogspot.com and download the "BITX ALL VERSIONS MANUAL". These are assembly manuals for all parts of the BITX? V3 in all its permutations. The frequency range of the VFO will depend upon the exact range you want to cover with the xcvr. You will probably have to experiment a bit to find the sweet spot for your rig. First, make it work, and THEN experiment with variations. john AD5YE ---In BITX20@..., <rhering6938@...> wrote : Hi All ,
Building my versin 3C and was wondering what the correct frequency range is, I found two different ranges. And where can I get the correct assembly for the 3C? Thanks
Ron
|
Hi All ,
Building my versin 3C and was wondering what the correct frequency range is, I found two different ranges. And where can I get the correct assembly for the 3C? Thanks
Ron
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Re: Just started building the Hendricks 17m Bitx
There are some videos for the 20a at It is almost identical to the 17a. Leonard | | | | Testing the 20a filter networks Evaluuating the filter networks in the 20a kit 89 meg 9 min Basic Alignment Alignment using only a VOM, second receiver, dummy load,
and an antenna 150 meg | | | | Preview by Yahoo | | | ?
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Re: Just started building the Hendricks 17m Bitx
Hi, Still building mine. The besttip I have is to use header pins and plugs on the cables to the main board, the wires break very easy and soon after many repairs the trace comes up. Good Luck.
Ron KF5QDW
--------------------------------------------
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On Sat, 10/10/15, jobaco@... [BITX20] <BITX20@...> wrote:
Subject: [BITX20] Just started building the Hendricks 17m Bitx
To: BITX20@...
Date: Saturday, October 10, 2015, 12:40 AM
?
Hi all members, I have just started building the
Hendricks 17m Bitx kit, has anyone else built one? any tips
would be welcome.
Vy 73
Colin DD5CF / G1ZOS
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Re: Just started building the Hendricks 17m Bitx
Colin,
I've just built a Hendricks BITX20A which is very similar to the BITX17A.
My first tip is to work very carefully with a fine tipped soldering iron and fine
nosed side cutters. Removing and replacing components must be done with great
care so as not to damage the PCB.
My next suggestion is to fit single-in-line header pins at connecting points
such as PWR, PTT, Volume, mic, Tune, etc. Then by using corresponding SIL
connectors, connections to the PCB can be repeatedly made/disconnected without
damaging the PCB. I fitted an 8 pin DIL header to carry the LM386 chip.
Also fit Vero pins to connect with all of the T type toroids that might need to
be re-fitted to set tuning ranges. FT toroids used for the various transformers
are unlikely to need to be re-fitted and so can be soldered directly to the
PCB.
Despite suggestions in the construction manual (for the BITX20A), attempting
to set the BFO frequency by ear did not work correctly for me. The BFO needs
to be set at approx the -20dB frequency on the low side of the IF response. I
found that setting the BFO for optimum audio quality resulted in too much
BFO/carrier RF being passed into the PA during Tx mode. The PA appeared to
become unstable.
Best to construct a plot of the frequency response of your IF filter, and from
this determine the -20dB frequency, then set the BFO accordingly using a
frequency counter or ACCURATELY calibrated Rx. To do this you will need an
ACCURATELY calibrated and precisely adjustable signal generator. I can
recommend the Arduino/SI5351 system that has been discussed previously on this
site.
Having built, tested, and set up my BITX20A board, I'm in the process of
fitting this into a larger enclosure (than the one provided) that will also
include the Arduino/Si5351/LCD system to provide VFO and BFO via DDS. The
latter has already been proved to work very well in a "rats nest" arrangement,
and provides much finer/easier tuning than the original VFO.
Hope that this helps.
Good luck with your project.
Regards
Ken Hough (M0KOH)
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On Friday 09 Oct 2015 22:40:32 you wrote: Hi all members, I have just started building the Hendricks 17m Bitx kit, has
anyone else built one? any tips would be welcome. Vy 73 Colin DD5CF / G1ZOS
|
Just started building the Hendricks 17m Bitx
Hi all members, I have just started building the Hendricks 17m Bitx kit, has anyone else built one? any tips would be welcome. Vy 73 Colin DD5CF / G1ZOS
|
I've pretty well finished construction and initial testing of my Hendricks
BITX20A kit. Not yet gone on the air with it, but Tx seems to work well into a
dummy load and Rx is good.
Initially, I used the on-board VFO and BFO, but have now successfully muted
these and replaced them by my Arduino/Si5351 device. Results are GOOD! Tuning
of VFO is now much more precise, and BFO can be set/re-set accuretely.
I've posted my latest version of the Arduino program/sketch (ie .ino file) to
the BITX Yahoo Files section in a directory named
'DDS_for_BITX20_Arduino_Si5351_KH'
This file includes for operation as a signal generator which can be used to
produce a plot of IF frequency response -- IMHO necessary for accurate
determination of BFO frequency.
Regards
Ken Hough (M0KOH)
|
New file uploaded to BITX20
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.
File : /DDS_for_BITX_Arduino_Si5351_KH/DDS_for_BITX20_v_0_1_0.ino
Uploaded by : ykenhough <kenhough@...>
Description : DDS for BITX20
Includes for running as a signal generator -- useful to determine IF frequency response and hence optimum BFO frequency
This has been checked out on a Hendricks BITX20A kit.
You can access this file at the URL:
To learn more about file sharing for your group, please visit:
Regards,
ykenhough <kenhough@...>
|
Re: SolderSmoke Podcast 177
? | ? | | ? | ? | ? | ? | ? | SolderSmoke Podcast #180 Pete's Beam, Simple-ceiver, 2-B, Noodling, Homebrew and SDR?, "The Martian", Mailbag SolderSmoke Podcast #180 is available: http://... | | | Preview by Yahoo | | ? |
19 September 2015
PROJECT REPORT:?
Pete's Antenna Project:? The Joy of Rotation!?
Simple-ceiver
Bill fixes Digi-Tia (after breaking it)
Shack Configured for Winter (DX-100)
Working (a little) on the Drake 2-B
SolderSmoke words we forgot to mention:?
Noodling
The Radio Gods
The Radio Art
The Grand Poobah
Magic Smoke?
Lud(d)ite Curmudgeonism
SDR and the Homebrewer?
"QSO Today" Interviews
Lady Ada interviews Paul Horowitz of "Art of Electronics"?
SHAMELESS COMMERCE:? Book still free!?
Start your Amazon purchases at our blog page.
Book Review:? "The Martian"?
Great QSOs with W5NDS and AE5RM
MAILBAG
On Saturday, June 13, 2015 11:12 AM, Bill Meara wrote:
??? SolderSmoke Podcast #177 is available: ?
? 13 June 2015 ? -- PETE JULIANO INDUCTED INTO THE QRP HALL OF FAME -- Bench Reports:? Bicoastal Bilateral Success:? A Tale of Two Tias ??? Only 3 TIA rigs in the world?? It depends... ??? Relay improvements in the BITX Builds ??? Straightening out amp problems ??? The many uses of copper foil ??? No phase noise or bleed-over troubles ??? Plug-in filters ??? Adjusting TIA amp gain on RX and TX (too much is not good!) ??? Getting the BITX to work?with the CCI amp ??? Allison wisely prescribes 3 db pads? ????Curing hum by moving the power supply (duh!) -- Farhan's New Minima -- Crying out for an Si551? -- Mike KL7R's Web Site is Back (thanks to W8NSA) -- SolderLex: Rigs or Radios?? We go with Rigs -- A ham right of passage:? Build a Dipole! -- What does your shack look like at the end of a project? -- MAILBAG? ????The CORRECT pronunciation of Belthorn ????Multiplication and Division by 4 ??? W8NSA, Vietnam, a?Transoceanic and a 9V Battery?
|
Re: Si5351 based vfo and bfo for bitx
I have a BITX? kit that I have? yet to build, and plan on using a si5351 as the VFO BFO.? I built a small si5351 VFO with display to use with a Chinese " Frog Sounds' CW transceiver. Used two of the clock outputs for separate receive and transmit oscillators to give split frequency operation.
Won't be hard to change one of them to a BFO instead.? Details on my blog KV4QB.blogspot.com
DuWayne
|
That's great news Ron, keep up the good work
John
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?
Thanks for the help, I found the problem. I installed q7
out of step, removed, the current is real close to 30ma.
77ma is with q7 installed driving the ADE-1.
|
Thanks for the help, I found the problem. I installed q7 out of step, removed, the current is real close to 30ma. 77ma is with q7 installed driving the ADE-1.
|
Hello Ron
Have you checked all the voltages in accordance with the Manual,
check the values of the source and emitter resistors, it is so easy
to get the colours wrong as the Browns and reds look very similar in
dull lighting
73
John
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?
Have? a question about current draw on the vfo test. The
manual says the total current shoulb be around 30ma, mine
is drawing 77ma. Have changed the J310, q6( 2N3904) and
the diode in the gate of the J310. Is this correct or i
the current too high? Any suggestions would sure help.
Thanks, Ron.
|
Have? a question about current draw on the vfo test. The manual says the total current shoulb be around 30ma, mine is drawing 77ma. Have changed the J310, q6( 2N3904) and the diode in the gate of the J310. Is this correct or i the current too high? Any suggestions would sure help. Thanks, Ron.
|
Colin DD5CF/G1ZOS
Leonard
DuWayne Schmidlkofer