Date   
knq7a output envelope

Ronald Hering
 

Hi all,
 I finally got the bias voltage right ( had a shorted 3357 ), now , not having a rf meter for 20 meters, I hung a scope on the antenna. I could only peak for 6 volts p-p, all the 530 voltages ars correct. Is what im seeing on the scope right or do i need to find an rf meter? Thanks ron


Re: knq7a output signal

John Landry
 

Ron,

This online calculator might be helpful:


73,

John
AA7US

---In CHINA_QRP@..., <rhering6938@...> wrote :

Hi Again,
I was aligning the tx section of my rig and don't have a watt meter for 20 meters so I put a scope probe on the antenna, the envelope measured 6 volts p-p. Is that about right or do i really need a watt meter? All voltages measure good, had to replace the 3357, shorted B-C. Thanks Ron


Re: knq7a output envelope

kb1gmx@...
 

Way low.

6V PP translates to 4.242V rms (Vp-p*.707) across 50 ohms or .08484A (ohms law)
and the power is RMS voltage * current or about .35W  not the nominal 6-10W
at nominal 13.8V.

I'd expect the RMS voltage for full power to be more than 17-20V RMS or about 
25 to 29V P-P.

The other thing to monitor is the current of the radio during transmit.  It should reach
2A (24-27W DC input) during normal operation.



Allison

New Products Plan - NP0 or C0G monolithic capacitors

Adam Rong
 

Gang,

Recently a famous QRPer in United States wrote to me looking for a good source of NP0 or C0G monolithic capacitors for VFO, and my recommendation is the light green capacitors that I have been using in my kits. It has a small Torch marking on the body. It is the best brand in China and the local price is about 2~3 times higher than other brands.

For the C0G or NP0, 5% tolerance, 100 volt type, it is good for both VFO and LPF purposes. The MOQ in China is 500 pcs, but I would like to split it into 100 pcs, asking for 5 USD not including shipping. C0G or NP0 capacitor value is no greater than 820 pF. Please let me know if you are interested, and the values you are looking for. Thank you.

Thanks,
Adam

Re: New Products Plan - NP0 or C0G monolithic capacitors

JOHN CRONHELM
 

Hi Adam,
Any chance you can send out
Smaller quantities of monolithic capacitors. May need some later but not right now.
John Vo1jcc.

On Dec 13, 2017 12:48 PM, "Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 


Gang,

Recently a famous QRPer in United States wrote to me looking for a good source of NP0 or C0G monolithic capacitors for VFO, and my recommendation is the light green capacitors that I have been using in my kits. It has a small Torch marking on the body. It is the best brand in China and the local price is about 2~3 times higher than other brands.

For the C0G or NP0, 5% tolerance, 100 volt type, it is good for both VFO and LPF purposes. The MOQ in China is 500 pcs, but I would like to split it into 100 pcs, asking for 5 USD not including shipping. C0G or NP0 capacitor value is no greater than 820 pF. Please let me know if you are interested, and the values you are looking for. Thank you.

Thanks,
Adam


Re: New Products Plan - NP0 or C0G monolithic capacitors

Adam Rong
 


Would 10 each of these values good for you? I will ask for $5 for each set of total 100 pcs and the shipping cost would be $5 each time.

15pF
22pF
27pF
47pF
100pF
150pF
220pF
270pF
470pF
820pF

Thanks,
Adam

2017年12月14日 08:11,"John Cronhelm johncronhelm@... [CHINA_QRP]" <CHINA_QRP@...>写道:

 

Hi Adam,
Any chance you can send out
Smaller quantities of monolithic capacitors. May need some later but not right now.
John Vo1jcc.

On Dec 13, 2017 12:48 PM, "Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 


Gang,

Recently a famous QRPer in United States wrote to me looking for a good source of NP0 or C0G monolithic capacitors for VFO, and my recommendation is the light green capacitors that I have been using in my kits. It has a small Torch marking on the body. It is the best brand in China and the local price is about 2~3 times higher than other brands.

For the C0G or NP0, 5% tolerance, 100 volt type, it is good for both VFO and LPF purposes. The MOQ in China is 500 pcs, but I would like to split it into 100 pcs, asking for 5 USD not including shipping. C0G or NP0 capacitor value is no greater than 820 pF. Please let me know if you are interested, and the values you are looking for. Thank you.

Thanks,
Adam


Re: New Products Plan - NP0 or C0G monolithic capacitors

JOHN CRONHELM
 

Thanks for letting me know the values you are offering.
None required at the present.

On Thursday, December 14, 2017, 12:54 PM, Adam Rong rongxh@... [CHINA_QRP] wrote:

 


Would 10 each of these values good for you? I will ask for $5 for each set of total 100 pcs and the shipping cost would be $5 each time.

15pF
22pF
27pF
47pF
100pF
150pF
220pF
270pF
470pF
820pF

Thanks,
Adam

2017年12月14日 08:11,"John Cronhelm johncronhelm@... [CHINA_QRP]" <CHINA_QRP@...>写道:
 

Hi Adam,
Any chance you can send out
Smaller quantities of monolithic capacitors. May need some later but not right now.
John Vo1jcc.

On Dec 13, 2017 12:48 PM, "Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 


Gang,

Recently a famous QRPer in United States wrote to me looking for a good source of NP0 or C0G monolithic capacitors for VFO, and my recommendation is the light green capacitors that I have been using in my kits. It has a small Torch marking on the body. It is the best brand in China and the local price is about 2~3 times higher than other brands.

For the C0G or NP0, 5% tolerance, 100 volt type, it is good for both VFO and LPF purposes. The MOQ in China is 500 pcs, but I would like to split it into 100 pcs, asking for 5 USD not including shipping. C0G or NP0 capacitor value is no greater than 820 pF. Please let me know if you are interested, and the values you are looking for. Thank you.

Thanks,
Adam


Re: New Products Plan - NP0 or C0G monolithic capacitors

Adam Rong
 

Guys,

I will offer another assortment at the same price. Please contact offline. I have ordered the parts and will ship next Monday if everything is smooth.

5.1pF
10pF
18pF
33pF
39pF
68pF
82pF
120pF
390pF
560pF

Thanks,
Adam

在 2017年12月15日,上午12:24,Adam Rong <rongxh@...> 写道:


Would 10 each of these values good for you? I will ask for $5 for each set of total 100 pcs and the shipping cost would be $5 each time.

15pF
22pF
27pF
47pF
100pF
150pF
220pF
270pF
470pF
820pF

Thanks,
Adam

2017年12月14日 08:11,"John Cronhelm johncronhelm@... [CHINA_QRP]" <CHINA_QRP@...>写道:
 

Hi Adam,
Any chance you can send out
Smaller quantities of monolithic capacitors. May need some later but not right now.
John Vo1jcc.

On Dec 13, 2017 12:48 PM, "Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 


Gang,

Recently a famous QRPer in United States wrote to me looking for a good source of NP0 or C0G monolithic capacitors for VFO, and my recommendation is the light green capacitors that I have been using in my kits. It has a small Torch marking on the body. It is the best brand in China and the local price is about 2~3 times higher than other brands.

For the C0G or NP0, 5% tolerance, 100 volt type, it is good for both VFO and LPF purposes. The MOQ in China is 500 pcs, but I would like to split it into 100 pcs, asking for 5 USD not including shipping. C0G or NP0 capacitor value is no greater than 820 pF. Please let me know if you are interested, and the values you are looking for. Thank you.

Thanks,
Adam




Re: New Products Plan - NP0 or C0G monolithic capacitors

Adam Rong
 

Guys,

This afternoon, I received 20 values of capacitors (total 10,000 capacitors), and I spent about 3 hours to kit for 5 customers. I am pleased to see these shining new "Green Beans" will be shipped tomorrow.

Instead of counting them, I weigh them. I found that different value has different unit weight, so I have to record the unit weight into a table. Next time, I should be able to kit faster.

Hope you enjoy the beans.

Thanks,
Adam



在 2017年12月15日,上午9:43,Adam Rong <rongxh@...> 写道:

Guys,

I will offer another assortment at the same price. Please contact offline. I have ordered the parts and will ship next Monday if everything is smooth.

5.1pF
10pF
18pF
33pF
39pF
68pF
82pF
120pF
390pF
560pF

Thanks,
Adam

在 2017年12月15日,上午12:24,Adam Rong <rongxh@...> 写道:


Would 10 each of these values good for you? I will ask for $5 for each set of total 100 pcs and the shipping cost would be $5 each time.

15pF
22pF
27pF
47pF
100pF
150pF
220pF
270pF
470pF
820pF

Thanks,
Adam

2017年12月14日 08:11,"John Cronhelm johncronhelm@... [CHINA_QRP]" <CHINA_QRP@...>写道:
 

Hi Adam,
Any chance you can send out
Smaller quantities of monolithic capacitors. May need some later but not right now.
John Vo1jcc.

On Dec 13, 2017 12:48 PM, "Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 


Gang,

Recently a famous QRPer in United States wrote to me looking for a good source of NP0 or C0G monolithic capacitors for VFO, and my recommendation is the light green capacitors that I have been using in my kits. It has a small Torch marking on the body. It is the best brand in China and the local price is about 2~3 times higher than other brands.

For the C0G or NP0, 5% tolerance, 100 volt type, it is good for both VFO and LPF purposes. The MOQ in China is 500 pcs, but I would like to split it into 100 pcs, asking for 5 USD not including shipping. C0G or NP0 capacitor value is no greater than 820 pF. Please let me know if you are interested, and the values you are looking for. Thank you.

Thanks,
Adam





NorCal 40 digital VFO version on Choc perfboard

Adam Rong
 

Gang,

Job is done. I get full 40-meter coverage without birdie on 7.023 MHz because my digital VFO outputs operating frequency plus BFO frequency. The bandwidth of the crystal filter seems a bit wide and I will figure out later once I have time.

The sidetone is pure but a bit low. I will adjust the frequency delta later. The RF output is 1.2 watt. Not very good but acceptable because I replaced the PA transistor with a BD139, very cheap one. 

I believe the modification of NC40A is very necessary to fix my issues. As an experiment, I am quite satisfied with what I have now.

Thanks,
Adam

Re: New Products Plan - NP0 or C0G monolithic capacitors

Adam Rong
 

Gang,

Merry Christmas!

I have shipped all the cap orders with a small gift. You can make an oscillator or even a Pixie2. Enjoy.

Thanks,
Adam

2017年12月15日 09:43,"Adam Rong" <rongxh@...>写道:

Guys,

I will offer another assortment at the same price. Please contact offline. I have ordered the parts and will ship next Monday if everything is smooth.

5.1pF
10pF
18pF
33pF
39pF
68pF
82pF
120pF
390pF
560pF

Thanks,
Adam


在 2017年12月15日,上午12:24,Adam Rong <rongxh@...> 写道:


Would 10 each of these values good for you? I will ask for $5 for each set of total 100 pcs and the shipping cost would be $5 each time.

15pF
22pF
27pF
47pF
100pF
150pF
220pF
270pF
470pF
820pF

Thanks,
Adam

2017年12月14日 08:11,"John Cronhelm johncronhelm@... [CHINA_QRP]" <CHINA_QRP@...>写道:
 

Hi Adam,
Any chance you can send out
Smaller quantities of monolithic capacitors. May need some later but not right now.
John Vo1jcc.

On Dec 13, 2017 12:48 PM, "Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 


Gang,

Recently a famous QRPer in United States wrote to me looking for a good source of NP0 or C0G monolithic capacitors for VFO, and my recommendation is the light green capacitors that I have been using in my kits. It has a small Torch marking on the body. It is the best brand in China and the local price is about 2~3 times higher than other brands.

For the C0G or NP0, 5% tolerance, 100 volt type, it is good for both VFO and LPF purposes. The MOQ in China is 500 pcs, but I would like to split it into 100 pcs, asking for 5 USD not including shipping. C0G or NP0 capacitor value is no greater than 820 pF. Please let me know if you are interested, and the values you are looking for. Thank you.

Thanks,
Adam





Re: New Products Plan - NP0 or C0G monolithic capacitors

John Landry
 

Hi Adam,

Merry Christmas to you and everyone here in the China QRP group.

73,

John
AA7US


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

Gang,

Merry Christmas!

I have shipped all the cap orders with a small gift. You can make an oscillator or even a Pixie2. Enjoy.

Thanks,
Adam

An idea of a charity project

Adam Rong
 

Gang,

This is my post on qrp-tech. Please comment.

A few days ago, an American ham wrote to me asking for donation of my single band SSB transceiver fully assembled. He wrote, I am interested in your mono band transceivers. I am disabled, low income and cannot build one. I wrote back to him to make sure he was serious, and worked with my US partner Larry to build a radio for him. I told Larry that it might be a good idea to start a project called "Donate a radio each year", and he agreed.

Just now, I had some email exchange with Chuck and I had a better idea on this. We can start a charity project to donate kits and distribute these kits for free. As a return, people can donate some money back to this project to make the project go on. As a starting point, I will donate about 20 NC40A kits to Chinese hams and will ask someone with good reputation to keep the money and run the project. I believe the project can expand to the worldwide, because I believe we have good supply chain here in China, and you have great designs, and both countries have people need help, so we can cooperate somehow.

Although it is for good cause, we still need to respect the copyright or design, so we need to ask for permission from the designer. Also, we don't want to compete with commercial projects, because it is not good for this ever shrinking QRP community.

It is still a very immature idea, but I'd like to hear from you guys.

Thanks,
Adam

Update to frequency display for CS-Series radio

n7rgw
 

I have added a summary of my experiments with the KN-Q7A and CS-Series radio using the Sandwich VFO.

Thought you might enjoy the read.  This discusses the latest modification to the Arduino Sketch to enable the OLED frequency display as well as the Dual-Band feature upgrades to the basic radio.

CRKITS.COM Retail Price Update

Adam Rong
 

Guys,

The following price will be effective from today. Web site will be updated this weekend. My Chinese New Year holiday starts from Feb 10. Before Chinese New Year, the shipment windows are Jan 29 and Feb 5. The shipment will be resumed on Feb 26 hopefully. Email order is available before web site update at rongxh@...

Item, CRKITS.COM retail price, CRKITS.COM shipping

Newly added:
C0G/NP0 Mono Cap Assortment 21x2535, 5
25 each of Torch brand 100V 5% 5.08mm lead space of 21 values: 5.1p, 10p, 15p, 22p, 27p, 33p, 39p, 47p, 68p, 82p, 100p, 120p, 150p, 220p, 270p, 330p, 390p, 470p, 560p, 820p

Price reduced:
CRK-10A kit, 44 (down from 55, limited stock), 5
Choc board, 2.5 (down from 3), 5
Case + 2 Choc, 15 (down from 18), 7 (down from 8)
CS kit, 99 (down from 113), 8 (down from 12)
CS kit + speaker mic, 120 (down from 138), 10 (down from 12)

Price unchanged:
DIY series coils and customized crystals, 1.5, 5
Sandwich kit, 19.9, 5
Sandwich programmer, 9.9, 0
R3500D kit, 30, 6
R3500D assembled, 39, 6

Thanks,
Adam

Test post only

 

Bob AF2DX

On Jan 26, 2018 10:29 AM, "Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 

Guys,


The following price will be effective from today. Web site will be updated this weekend. My Chinese New Year holiday starts from Feb 10. Before Chinese New Year, the shipment windows are Jan 29 and Feb 5. The shipment will be resumed on Feb 26 hopefully. Email order is available before web site update at rongxh@...

Item, CRKITS.COM retail price, CRKITS.COM shipping

Newly added:
C0G /NP0 Mono Cap Assortment 21x25, 35, 5
25 each of Torch brand 100V 5% 5.08mm lead space of 21 values: 5.1p, 10p, 15p, 22p, 27p, 33p, 39p, 47p, 68p, 82p, 100p, 120p, 150p, 220p, 270p, 330p, 390p, 470p, 560p, 820p

Price reduced:
CRK-10A kit, 44 (down from 55, limited stock), 5
Choc board, 2.5 (down from 3), 5
Case + 2 Choc, 15 (down from 18), 7 (down from 8)
CS kit, 99 (down from 113), 8 (down from 12)
CS kit + speaker mic, 120 (down from 138), 10 (down from 12)

Price unchanged:
DIY series coils and customized crystals, 1.5, 5
Sandwich kit, 19.9, 5
Sandwich programmer, 9.9, 0
R3500D kit, 30, 6
R3500D assembled, 39, 6

Thanks,
Adam

Re: HB1B

 

Any member here have the later HB1B rig? Want to know  what the new chip does and can I buy the  chip? Thanks Bob 

On Jan 28, 2018 2:07 AM, "Bob Lech beargyrils@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 

Bob AF2DX

On Jan 26, 2018 10:29 AM, "Adam Rong rongxh@... [CHINA_QRP]" <CHINA_QRP@...> wrote:
 

Guys,


The following price will be effective from today. Web site will be updated this weekend. My Chinese New Year holiday starts from Feb 10. Before Chinese New Year, the shipment windows are Jan 29 and Feb 5. The shipment will be resumed on Feb 26 hopefully. Email order is available before web site update at rongxh@...

Item, CRKITS.COM retail price, CRKITS.COM shipping

Newly added:
C0G /NP0 Mono Cap Assortment 21x25, 35, 5
25 each of Torch brand 100V 5% 5.08mm lead space of 21 values: 5.1p, 10p, 15p, 22p, 27p, 33p, 39p, 47p, 68p, 82p, 100p, 120p, 150p, 220p, 270p, 330p, 390p, 470p, 560p, 820p

Price reduced:
CRK-10A kit, 44 (down from 55, limited stock), 5
Choc board, 2.5 (down from 3), 5
Case + 2 Choc, 15 (down from 18), 7 (down from 8)
CS kit, 99 (down from 113), 8 (down from 12)
CS kit + speaker mic, 120 (down from 138), 10 (down from 12)

Price unchanged:
DIY series coils and customized crystals, 1.5, 5
Sandwich kit, 19.9, 5
Sandwich programmer, 9.9, 0
R3500D kit, 30, 6
R3500D assembled, 39, 6

Thanks,
Adam


Re: An idea of a charity project

petrika_j@...
 

Hello Adam,

I think this is really great idea.

Here in Z3 (Macedonia) one of our friends, Z35A has fire ih his PPS and he lost everything in a moment ( https://www.facebook.com/trajko.gjorcevski/media_set?set=a.1481376748656000.1073741835.100003510672654&type=3&pnref=lhc )
Our Radio Club Z3FFF - Zeleznicar from it modest funds donate one VHF handheld radio. Unfortunately we do not have more funds to provide this vetaran operator with HF station to continue his work on HF bands.
I read today that you start this project supporting HAM operators in need world wide. Would you be so kind to donate one kit to our operator also ? This kit will be assembled by one of our operators (Goran Trajanovski, https://www.facebook.com/goran.trajanovski.54 ) and after that we are going to give this unit to Z35A as fully assembled unit.

I hope this would help our friend Z35A to start work again and recover from this terrible disaster.

Eveyone interested to donate for our friend is welcome to contact our club president, Mr.Goce Boshkovski (Z36TT) at Facebook  ( https://www.facebook.com/goceb ) and arrange details about eventually donation in equipment.

Thank you very much for your help and understanding of situation.

With regards
Petrika
Z34PEC

Re: An idea of a charity project

Adam Rong
 

Hi Petrika,

Thanks for providing the information of the people in need. Let me update to you the comments I have received so far. Charity account is very sensitive and we will make it simple: if we do charity project, we will offer at low price so people can afford it. If people need donation, one radio per year is okay for me. I will let the members of this group to comment if it is okay to use this year’s quota. I will send the kit if I receive 5 replies saying yes.

Thanks,
Adam

在 2018年2月3日,下午2:44,petrika_j@... [CHINA_QRP] <CHINA_QRP@...> 写道:

 

Hello Adam,

I think this is really great idea.

Here in Z3 (Macedonia) one of our friends, Z35A has fire ih his PPS and he lost everything in a moment ( https://www.facebook.com/trajko.gjorcevski/media_set?set=a.1481376748656000.1073741835.100003510672654&type=3&pnref=lhc )
Our Radio Club Z3FFF - Zeleznicar from it modest funds donate one VHF handheld radio. Unfortunately we do not have more funds to provide this vetaran operator with HF station to continue his work on HF bands.
I read today that you start this project supporting HAM operators in need world wide. Would you be so kind to donate one kit to our operator also ? This kit will be assembled by one of our operators (Goran Trajanovski, https://www.facebook.com/goran.trajanovski.54 ) and after that we are going to give this unit to Z35A as fully assembled unit.

I hope this would help our friend Z35A to start work again and recover from this terrible disaster.

Eveyone interested to donate for our friend is welcome to contact our club president, Mr.Goce Boshkovski (Z36TT) at Facebook  ( https://www.facebook.com/goceb ) and arrange details about eventually donation in equipment.

Thank you very much for your help and understanding of situation.

With regards
Petrika
Z34PEC

CS-40F: Radio for FT-8

Adam Rong
 

Gang,

We are working on a radio kit around 7074kHz USB dedicated for FT-8. Basically it is a crystal controlled KN-Q7A working in USB mode with narrow fine tuning range and high frequency stability. The price will be around 85 USD including shipping. Let me know if you like it.

Thanks,
Adam