Date   

Re: New Possible Modifications for CS-series (or KN-Q7A) with Sandwich

n7rgw
 

OK, I am finally ready to announce the Dual Band modification to the KN-Q7A or CS-series radio using the Sandwich VFO.  The modification is easy.
I can provide the Sandwich code modification based on three things:
    1)  Base frequency of original radio (basically the crystal filter chain frequency)
    2)  Base Band operation for example a CS-40 or 40 Meter band operation.
    3)  Additional band you wish to add such as 80 Meters to the 40 Meter base radio.

The cost of the kit includes a PCB for both the Receive and Transmit Frequencies, all parts including the appropriate DIY7 coils.  The introductory price will be $35 USD plus shipping. 

Software will be downloadable from my website once I complete the various permutations of the code.  The software and schematic will be available whether you purchase my kit or not.  However, I support what I sell.

I made a slight error to the first PCB, so you will need to follow the instructions regarding the coils.  I will fix the problem on the next revision of the PCB.  The error does not affect the signal or the filter.

The first run will have limited quantities available.  I have for example 4 kits ready for shipment 80/40 for Base 40 Meter.  I will kit others as the orders come in.

I am finishing the touches of the manual which should be available by the end of the day.


Re: KN-Q7A Board rev. 2.2 complete circuit diagram.

n7rgw
 

The difference (main) between Rev C and Rev D is the addition of a speaker mike capability.  Thus, an additional pin is added to the printed circuit board.  The speaker/mike will work with either Rev C or Rev D boards, but you would have to run a wire to the microphone connector (Pin 8) from the speaker connection.
You can download the Rev D manual and other bits of information from my website http://www.larvell.net/Side_Left_B/Download.htm.   (www.qrvtronics.com)

A couple of issues that I have found with power output are as follows.  Make sure that you have wound the toroids properly (easy to miss-count).  See: http://www.larvell.net/Side_Left_B/files/KN-Q7A_App_WindingTheToroid.pdf for additional help.  Make sure that the wire leads have been properly stripped.  With an ohmmeter, you can check the points on the printed circuit boards for the coils making contact.  

The next issue is to check the Transmit Band Pass filter for proper tuning.  If you have a signal generator and an oscilloscope, you can adjust the filter without power to your radio.  I inject the signal at pin 4 on the NE602 and check the signal with the oscilloscope on the 680 ohm resistor.  Adjust the coils for maximum amplitude.

If all that fails, Short Pin 2 and 3 on the NE602 nearest the IF crystal.  This will take the radio out of SSB and you should transmit only the carrier wave.

Check to see where you are loosing the signal.  With an oscilloscope check the amplitude on Pin 4 of the NE602.  Press and release the push-to-talk button on each test.  Next look at the amplitude on the SMD part C3357 on the tab.  The amplitude should have increased.  Next check the amplitude on the Collector of the D882 transistor.  Again, the amplitude should have increased.  Finally, check the amplitude on the 104 cap that leads into the final High Pass Filter section.  You should get a very large voltage swing.

One other thing that I will do just to check the transmit section would be to inject a small signal at the carrier frequency at the 680 ohm resistor.  Try about 50 mV to 100 mV if possible.  Then check each step of the transmitter with an oscilloscope.

You can contact me directly at n7rgw@...
Good luck
Larry


 


Re: KN-Q7A Board rev. 2.2 complete circuit diagram.

Adam Rong
 

Bob,

Please download the full manual package including schematic from:


The 5 pin connector has one additional pin for speaker output, and it should connect to pin 8 of the round mic connector on panel. For ICOM HM-36, it does not have speaker built in, but we do have supply of speaker microphone.

If your ICOM HM-36 is not electret type, the output can be too low to drive enough RF output. You need to talk loudly to your microphone to have higher RF output. If you don’t talk to the microphone, you will get nothing after the first moment of pressing PTT.

Thanks,
Adam

在 2017年7月17日,下午8:44,vk2aor@... [CHINA_QRP] <CHINA_QRP@...> 写道:


Hi Al


New to this group.


A member of my radio club built the above kit and was trying to get it going with the Rev C notes.  He asked me to have look and see if I could get it going.   the Rev C refers to a 4pin MIC connection and Rev D shows the 5 pin MIC connection on the board and he has purchased a speaker /MIC with the kit.   The manual says that there is a complete circuit diagram but I could not find it in the files section or the website.   This would be helpful and would appreciate a copy if anyone can help.


The manual also said that a HM Series Icon mike will work with it.    Once the 5 pin cable to the 8 pin MIC socket was wired correctly  my HM-36 worked for PTT and started to get power output and could see the modulating signal on my CRO, but only 0.5 watts.

Adjusted the bias current to 0.543 Amps and it appeared to increase the power but while holding the mic button down and no modulation the power decreased.   Have I interpreted the instructions correctly?   On my other transceivers on SSB there maybe a quick flicker of power then nothing till there is some modulation.  Also with AM I would be able to see steady output to be able to adjust the transmitter.


  I have a 2 tone battery operated board which I will wire into an 8 pin mic socket with a switch for PTT and see what Happens.   I would be good to have a complete schematic  with the manual for reference and service at a later date.


I appreciate this forum and look forward to some clues.


Bob VK2AOR




KN-Q7A Board rev. 2.2 complete circuit diagram.

Robert Hudson
 

Hi Al


New to this group.


A member of my radio club built the above kit and was trying to get it going with the Rev C notes.  He asked me to have look and see if I could get it going.   the Rev C refers to a 4pin MIC connection and Rev D shows the 5 pin MIC connection on the board and he has purchased a speaker /MIC with the kit.   The manual says that there is a complete circuit diagram but I could not find it in the files section or the website.   This would be helpful and would appreciate a copy if anyone can help.


The manual also said that a HM Series Icon mike will work with it.    Once the 5 pin cable to the 8 pin MIC socket was wired correctly  my HM-36 worked for PTT and started to get power output and could see the modulating signal on my CRO, but only 0.5 watts.

Adjusted the bias current to 0.543 Amps and it appeared to increase the power but while holding the mic button down and no modulation the power decreased.   Have I interpreted the instructions correctly?   On my other transceivers on SSB there maybe a quick flicker of power then nothing till there is some modulation.  Also with AM I would be able to see steady output to be able to adjust the transmitter.


  I have a 2 tone battery operated board which I will wire into an 8 pin mic socket with a switch for PTT and see what Happens.   I would be good to have a complete schematic  with the manual for reference and service at a later date.


I appreciate this forum and look forward to some clues.


Bob VK2AOR


Article for Choc Perf Board

Adam Rong
 

Folks,

I just uploaded a small article about building SSB radio with Choc Perf
Board. I kept MS Word format so that you can feel free to reuse it for
your club or association publications. I have already submitted to
Amateur Radio magazine in Australia as Knobless Wonder is quite well
known there.

http://crkits.com/chocperfboard.doc

Thanks,
Adam


Re: Challenge: Building a BITX on a Perf Board? [2 Attachments]

AA7US
 


---In CHINA_QRP@..., <rongxh@...> wrote :

> Another project in mind is to make a DSB radio with VOX by 3x3 units so it can be used for digital modes like PSK31 or JT65. I have many 14070 crystals on hand.


Now that sounds interesting!

73,

John
AA7US


Re: Challenge: Building a BITX on a Perf Board? [2 Attachments]

Adam Rong
 

What do we do with the small pieces of the perf board? An oscillator for crystal? A noise generator? Or a RF probe? Another project in mind is to make a DSB radio with VOX by 3x3 units so it can be used for digital modes like PSK31 or JT65. I have many 14070 crystals on hand.

Thanks,
Adam

2017年7月2日 13:13,"mx6s@... [CHINA_QRP]" <CHINA_QRP@...>写道:

 
[Attachment(s) from mx6s@... [CHINA_QRP] included below]


Hi Adam,

Thank you the reference.
What I sent was a wrong drawing.
The most attractive board feature is large holes just fit to any 7mm coil.
Attached one is the template I am using.

Junichi JL1KRA



Re: FX-9A QRP transceiver 2017 version

AA7US
 

There are several reviews on eHam.net...


John
AA7US



---In CHINA_QRP@..., <dpflugrath@...> wrote :

Anyone having a look at the FX-9A QRP transceiver?  


Dan KA7GPP


Re: FX-9A QRP transceiver 2017 version

Dan Pflugrath
 

The price seems in line with similar Chinese radios at $380 USD and lots less than the FT817 which is bigger and heavier.  See the Ebay posting.


10 bands,15 watts, smallest size and light weight, and the initial release has been out since 2015.    
Dan KA7GPP



Re: FX-9A QRP transceiver 2017 version

Brian Schmitt
 

After seeing the price of around $600, I would just go ahead and pay more to get a Yaesu or Icom for $800 - $900.  Or shop for a used icom or yaesu on ebay. 

I would pay no more than $200 for the FX-9A.  It will probably break in 1 - 3 years of rugged use. 


Re: FX-9A QRP transceiver 2017 version

Christopher Leslie
 

Seems a little pricey compared to what's available and what they offer for similar prices.


On Jul 2, 2017, at 12:55 AM, dpflugrath@... [CHINA_QRP] <CHINA_QRP@...> wrote:

 

Anyone having a look at the FX-9A QRP transceiver?  


Dan KA7GPP


FX-9A QRP transceiver 2017 version

Dan Pflugrath
 

Anyone having a look at the FX-9A QRP transceiver?  


Dan KA7GPP


Re: Challenge: Building a BITX on a Perf Board?

qrpjl1kra
 


Hi Adam,

Thank you the reference.
What I sent was a wrong drawing.
The most attractive board feature is large holes just fit to any 7mm coil.
Attached one is the template I am using.

Junichi JL1KRA


Re: Challenge: Building a BITX on a Perf Board?

Adam Rong
 

Thanks, Nakajima-san.

Your drawing is very nice. Here I attach my drawing to show the detail of the hole size / printing and mounting holes for IF transformers.

Thanks,
Adam

于 2017-7-2 10:21, mx6s@... [CHINA_QRP] 写道:

 

Hi Adam and folks,


I made a simple template of the chocolate board.
It's helpful to consider parts layout before starting parts population.

Thank you.

Juncihi JL1KRA


Re: Challenge: Building a BITX on a Perf Board?

qrpjl1kra
 

Hi Adam and folks,

I made a simple template of the chocolate board.
It's helpful to consider parts layout before starting parts population.

Thank you.

Juncihi JL1KRA


Re: Challenge: Building a BITX on a Perf Board?

Adam Rong
 

Web site is updated to add Choc Perf Board.

http://crkits.com


2017年6月24日 23:09,"Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...>写道:

 

Alright, here is the price, besides what are available from my web shop at http://crkits.com:

Shipping now:
Choc Perf Board 3 USD each, plus 5 USD shipping
Choc Perf Board x 2 + KN-Q7A metal case x 1 = 18 USD, plus 8 USD shipping
DIY7 series coils including DIY7-3.8, DIY7-7, DIY7-14, DIY7-21  1.5 USD each, plus 5 USD shipping
Crystals 7003, 7010, 7020, 7025, 7030, 7040, 10106, 10130, 14060, 14070  1.5 USD each, plus 5 USD shipping

Ship in 1~2 weeks depending on parts availability, limited quantity 20 pcs for the 1st batch:
Choc Perf Board version Knobless Wonder kit 7.200 MHz with case and controls (you drill holes for the panels yourself, no pre-drilled face plates will be provided) = 45 USD, plus 10 USD shipping, if you add speaker mic, add 25 USD including shipping

Send PayPal payment to rongxh@... and leave message for what you need to order and your ship-to-address, and I will ship early next week.

Thanks,
Adam


在 2017年6月24日,上午11:51,Adam Rong rongxh@... [CHINA_QRP] <CHINA_QRP@...> 写道:

[Attachment(s) from Adam Rong included below]

Another Chocolate Perf Board project: 49er CW transceiver in CRK-10A case. It is amazing that the width of 2 units fits the case so well, and cutting the length is not difficult at all. So good for a mechanical dummy like myself.

Thanks,
Adam

2017年6月20日 20:53,Adam Rong <bd6cr@...>写道:
They are available from crkits.com. Likely this is a kit with all the parts. Both 7090 and 7190 will be offered.

2017年6月20日 15:29xff0c;"martin jarvis martinfilbertjarvis@... [CHINA_QRP]" <CHINA_QRP@...>写道xff1a;
 

very interesting - where are the DIY7 series variable inductors available from? thanks

On 20 June 2017 at 16:18, Adam Rong rongxh@... [CHINA_QRP] <CHINA_QRP@...> wrote:
 
[Attachment(s) from Adam Rong included below]

This is my 2nd KW (Knobless Wonder). I made a few changes to the layout and components. The wires are now on component side. Some toroid  transformers are replaced by DIY7 series and fixed inductor. I spent a few hours debugging a self oscillation issue and the fix is to add a small resistor to the emitter pin of the final PA to ground.

I will go for a business trip shortly. For the pricing and availability, please stay tuned.

Thanks,
Adam

2017年6月18日 22:31xff0c;"landrjoh@... [CHINA_QRP]" <CHINA_QRP@...>写道xff1a;
 


---In CHINA_QRP@..., <rongxh@...> wrote :

> Let’s do 7190. It will be an international frequency and it is also okay for US technician class.

Seems like a good choice.

> I suppose nobody like winding coils, especially bi-filar or tri-filar?

I don't mind the winding part so much, it's the stripping enamel and tinning of the tiny wire leads that's somewhat unpleasant to me.  Either way works.

73,

John
AA7US









Re: New Possible Modifications for CS-series (or KN-Q7A) with Sandwich

AA7US
 

This will be a very worthwhile upgrade to the KN-Q7A and CS radios.

Thank you for making it available Larry.

I'm anxiously waiting to order one.

John
AA7US


---In CHINA_QRP@..., <larry.lovell@...> wrote :

I am putting together a kit upgrade that can be added to a KN-Q7A with Sandwich or the new CS-Series radio. 


Re: New Possible Modifications for CS-series (or KN-Q7A) with Sandwich

n7rgw
 

I am putting together a kit upgrade that can be added to a KN-Q7A with Sandwich or the new CS-Series radio.  The kit will include two PC boards along with all components to make the modification to adapt the radio to operate in dual band mode.  
My first experiments have been with 40 Meters and 80 Meters.  It appears to work very well.  The kit will be available for any two frequencies of operation, 40/80 or 40/20, etc.
I am estimating that the initial cost will be $35 per kit plus shipping.  It will be posted on my website at QRVTronics.com.  You can reach me at n7rgw@... as well.  It probably will not be ready for shipping for a couple of weeks while I am waiting for the PC boards to arrive and be checked out.
The first kits will be limited in quantity to 9, assuming the PCB works properly.  I will post parts lists and instructions within the next week.
You can build it from scratch if you wish.  I will try to provide any help you might need.
Larry - N7RGW


Re: Challenge: Building a BITX on a Perf Board?

Adam Rong
 

Yes, I do. Hope it helps.

C is connected to L1-3 and L1-3 is the primary winding. Pin 2 is the tap in the middle. L1-2 and L2-3 have the same amount of turns.  L4-6 is the secondary winding.



Thanks,
Adam


于 2017-6-25 8:58, martin jarvis martinfilbertjarvis@... [CHINA_QRP] 写道:

 
Hi Adam - do you have specs (inductance etc) on  DIY7-3.8, DIY7-7, DIY7-14, DIY7-21 - thanks

On 25 June 2017 at 01:09, Adam Rong rongxh@... [CHINA_QRP] <CHINA_QRP@...> wrote:
 
Alright, here is the price, besides what are available from my web shop at http://crkits.com:

Shipping now:
Choc Perf Board 3 USD each, plus 5 USD shipping
Choc Perf Board x 2 + KN-Q7A metal case x 1 = 18 USD, plus 8 USD shipping
DIY7 series coils including DIY7-3.8, DIY7-7, DIY7-14, DIY7-21  1.5 USD each, plus 5 USD shipping
Crystals 7003, 7010, 7020, 7025, 7030, 7040, 10106, 10130, 14060, 14070  1.5 USD each, plus 5 USD shipping

Ship in 1~2 weeks depending on parts availability, limited quantity 20 pcs for the 1st batch:
Choc Perf Board version Knobless Wonder kit 7.200 MHz with case and controls (you drill holes for the panels yourself, no pre-drilled face plates will be provided) = 45 USD, plus 10 USD shipping, if you add speaker mic, add 25 USD including shipping

Send PayPal payment to rongxh@... and leave message for what you need to order and your ship-to-address, and I will ship early next week.

Thanks,
Adam


在 2017年6月24日,上午11:51,Adam Rong rongxh@... [CHINA_QRP] <CHINA_QRP@...> 写道:

[Attachment(s) from Adam Rong included below]

Another Chocolate Perf Board project: 49er CW transceiver in CRK-10A case. It is amazing that the width of 2 units fits the case so well, and cutting the length is not difficult at all. So good for a mechanical dummy like myself.

Thanks,
Adam

2017年6月 20日 20:53,Adam Rong <bd6cr@...> 写道:
They are available from crkits.com. Likely this is a kit with all the parts. Both 7090 and 7190 will be offered.

2017 年6月20日 15:29xff0c;"martin jarvis martinfilbertjarvis@gmail.com [CHINA_QRP]" <CHINA_QRP@...>写 道xff1a;
 

very interesting - where are the DIY7 series variable inductors available from? thanks

On 20 June 2017 at 16:18, Adam Rong rongxh@... [CHINA_QRP] <CHINA_QRP@yahoogroups.com> wrote:
 
[Attachment(s) from Adam Rong included below]

This is my 2nd KW (Knobless Wonder). I made a few changes to the layout and components. The wires are now on component side. Some toroid  transformers are replaced by DIY7 series and fixed inductor. I spent a few hours debugging a self oscillation issue and the fix is to add a small resistor to the emitter pin of the final PA to ground.

I will go for a business trip shortly. For the pricing and availability, please stay tuned.

Thanks,
Adam

2017年6月18 日 22:31xff0c;"landrjoh@postpro.net [CHINA_QRP]" <CHINA_QRP@...>写 道xff1a;
 


---In CHINA_QRP@yahoogroups.com, wrote :

> Let’s do 7190. It will be an international frequency and it is also okay for US technician class.

Seems like a good choice.

> I suppose nobody like winding coils, especially bi-filar or tri-filar?

I don't mind the winding part so much, it's the stripping enamel and tinning of the tiny wire leads that's somewhat unpleasant to me.  Either way works.

73,

John
AA7US










Re: Challenge: Building a BITX on a Perf Board?

qrpjl1kra
 

Hi Adam and all,

The choc-board is a fantastic gift to builders.
It can minimize wiring under block construction.
The board fit the DIY and other 7mm square coils.

By using template and parts mounting drawing 
Even beginners who doesn't read circuit diagram 
are able to make same circuit as they instructed.

The Knobless wonder will be the simplest SSB transceiver kit in the world !

Junichi JL1KRA