Date   

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






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

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
 


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
 

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



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: 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


Re: knq7a output signal

AA7US
 

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



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



knq7a output signal

Ronald Hering
 

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



8% off for CS Series SSB kit

Adam Rong
 

Gang,

As the year end comes, we will provide 8% off promotion for CS-series
kit only from now on to the end of this year.

Place online order through:
http://crkits.com

Thanks,
Adam


Re: Frequency Display for Sandwich

n7rgw
 

I have now decided to make the faceplates for all three of these options available, LCD, Larger OLED and Small OLED display.  The cost is $8 per plate plus shipping.  Both front and back plates are available for the LCD kit at $14 the pair.  Options are, matted finish, glossy finish and glossy with white letters depending on my stock.  PayPal: larry@....  Please specify finish and faceplate.  US shipping is $3.00.
The complete kit for the small and larger OLED are $30 each.


Re: CS-Series IF

kb1gmx@...
 

Here in the USA 9MHZ crystals are common.  I've built many filter using them. 
however ladder filter like in KNQ7A and others will cave a center frequency
slightly lower than 9mhz (using rocks that test at 9mhz, my filters are more like
8.997 to 8.9985mhz center frequency.)  though for this use that should be ok.

You will have to workout the capacitor values to use for that set of crystals.


Allison/Kb1GMX


Re: knq7a bias current

kb1gmx@...
 

The drain should be very near the power supply voltage if its dropping its either a 
problem with the meter going nuts from RF (They do that!) or your power supply 
is weak.

The gate voltage for the final will vary from device to device for a given drain 
current.  I've seen 2-3V typical across a lot of IRF510s (I use them for a lot of stuff).

Other reasons for increased drain on TX is, final is oscillating, or carrier leakage.
The latter can be due to an error around the NE602 (U3 on some schematics).
If the device is unbalanced due to a misplaced part of other short or leakage
it will emit carrier and that will show RF power (maybe milliwatts) output and 
increased drain.  Also if the carrier frequency adjustment is way off you may 
not be on the edge of the filter pass band and instead you can be inside the
passband.  That can also contribute excess carrier at output.

Just a few thoughts.

Allison


Re: knq7a bias current

Ronald Hering
 

I did some more checking and changed the 510, the gate voltage goes to 2.2 volts on keying and the drain drops to around 10 volts all other voltages arereal close to the chart.
--------------------------------------------

On Sat, 10/21/17, Adam Rong rongxh@gmail.com [CHINA_QRP] <CHINA_QRP@yahoogroups.com> wrote:

Subject: Re: [CHINA_QRP] knq7a bias current
To: CHINA_QRP@yahoogroups.com
Date: Saturday, October 21, 2017, 10:40 AM


 












Ron,



Have you observed very hot parts during transmission?
Besides the
trimmer position, please check if you have properly
installed the
insulators for BD139/D882 and IRF510.



Thanks,

Adam



于 2017-10-21 23:28, rhering6938@att.net
[CHINA_QRP] 写道:



 


Hi All,

Finally getting around to finishing my knq7,
but ran into
a problem.

 The idle current is around 40 ma but when
PTT is keyed it
jumps up to around 1400ma at the low end. Any
ideas on
where to start looking? All help will be
greatly
appreciated. Thanks, Ron.
























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Re: knq7a bias current

Adam Rong
 

Ron,

Have you observed very hot parts during transmission? Besides the trimmer position, please check if you have properly installed the insulators for BD139/D882 and IRF510.

Thanks,
Adam

于 2017-10-21 23:28, rhering6938@... [CHINA_QRP] 写道:

 

Hi All,
Finally getting around to finishing my knq7, but ran into a problem.
 The idle current is around 40 ma but when PTT is keyed it jumps up to around 1400ma at the low end. Any ideas on where to start looking? All help will be greatly appreciated. Thanks, Ron.




knq7a bias current

Ronald Hering
 

Hi All,
Finally getting around to finishing my knq7, but ran into a problem.
 The idle current is around 40 ma but when PTT is keyed it jumps up to around 1400ma at the low end. Any ideas on where to start looking? All help will be greatly appreciated. Thanks, Ron.



Re: CS-Series IF

Adam Rong
 

John,

In old days, when SSB radio is homemade, 9MHz IF is used because 5.0-5.5MHz VFO can be used for both 20 meter and 80 meter bands. However, 9MHz crystal is not generally available, so nearby frequency crystals can be chosen.

Thanks,
Adam


On Oct 21, 2017 2:10 AM, landrjoh@... [CHINA_QRP] wrote:
 

Adam,


The CS-Series is a great platform for learning and experimenting by changing a few components at a time just to see what effect it has.


So I'm curious why 8.4672 MHz was chosen as the IF in the CS-Series transceiver?


Could another frequency in the 8-10 MHz range be safely substituted for experimental purposes?  I do realize this would require completely recalculating and rebuilding the crystal ladder filter, replacing the crystal in the IF amp, and also altering the Arduino software.


Thank you,


John

AA7US


CS-Series IF

AA7US
 

Adam,


The CS-Series is a great platform for learning and experimenting by changing a few components at a time just to see what effect it has.


So I'm curious why 8.4672 MHz was chosen as the IF in the CS-Series transceiver?


Could another frequency in the 8-10 MHz range be safely substituted for experimental purposes?  I do realize this would require completely recalculating and rebuilding the crystal ladder filter, replacing the crystal in the IF amp, and also altering the Arduino software.


Thank you,


John

AA7US


CAT for CS-series

Adam Rong
 

Gang,

I think everyone should be informed of this effort by JH3BTK. He did modification for JT-65 and FT-8 before and now he is supporting CAT for CS-series.

http://www.geocities.jp/mx6s/JH3BTK2.html

Thanks to Nakajima-san for English translation.

Thanks,
Adam

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