Date   
Re: D4D: Documentations

Adam Rong
 

Software settings in Chinese. Try Google translation if you cannot fully understand from pictures.
https://mp.weixin.qq.com/s/VSHwEVKzNMG2F2GUVkCcCQ

Thanks,
Adam

在 2019年5月16日,上午8:05,Adam Rong via Groups.Io <rongxh@...> 写道:

New file uploaded to crkits@groups.io

crkits@groups.io Notification <crkits+notification@...>
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the crkits@groups.io group.

File: d4dpartlist20190519forMP.xls

Uploaded By: Adam Rong

Description:
D4d part list 20m/40m for MP.

You can access this file at the URL:
https://groups.io/g/crkits/files/D4D%20Kit%20Documentations/d4dpartlist20190519forMP.xls

Cheers,
The Groups.io Team

New file uploaded to crkits@groups.io

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Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the crkits@groups.io group.

File: d4dqgreva.pdf

Uploaded By: Adam Rong

Description:
D4D Quick Guide Rev A - May 19, 2019.

You can access this file at the URL:
https://groups.io/g/crkits/files/D4D%20Kit%20Documentations/d4dqgreva.pdf

Cheers,
The Groups.io Team

Re: IMD performance of D4D

Adam Rong
 

Gang,

Compared with 2nd and 3rd harmonics, the adjacent channel IMD products are higher. I did try to attenuate the input audio and it will improve but the result was not so satisfying. In this way, I have decided to remove C20 and C23 to change the LPF from elliptical to regular filter. It will improve the impedance matching with the antenna at the cost of higher 2nd harmonics. I will add this note into the full manual.

Beta testers, please remove C20 and C23 as well.

For serious builders, please follow this page to try:
https://pa3csg.nl/?page_id=40

Thanks,
Adam

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Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the crkits@groups.io group.

File: D4D kit manual.pdf

Uploaded By: Adam Rong

Description:
Preview version of D4D full manual. Still lots of work to do, but I am posting here for comments.

You can access this file at the URL:
https://groups.io/g/crkits/files/D4D%20Kit%20Documentations/D4D%20kit%20manual.pdf

Cheers,
The Groups.io Team

Poor boys DSB FT8

Adam Rong
 

Folks,

Anyone has access to this page?

https://qrpguys.com/poor-boys-40-30-20-1-10w-dsb-ft8-transceiver

It seems new but I am curious about the design concept.

Thanks,
Adam

D4D: First Shipment

Adam Rong
 

Folks,

I just shipped three boxes yesterday to my shipping agent and today they will ship to worldwide. The backlog is not cleared so I will ship some more next Monday. After shipping, I will update tracking number in PayPal.

The full manual preview draft is already in the files section. I will take time to improve it this week. You will see a brand new version when you get the kit.

Thanks,
Adam

D4D for 6m band?

Greg DL3GJ
 

Hi Adam, congrats on fantastic product idea!

I checked the archive and did not find the answer so created new topic: did you consider making a 6m version of the D4D TRX? As most of the traffic on the "magic band" is FT8 it would be perfect device to take for travel - combined with Raspberry Pi and small, portable antenna... If possible - one for me please!

73 de DL3GJ Greg

Re: D4D for 6m band?

Adam Rong
 

Greg,

It could be challenging due to thermal drift of the crystal. A TCXO is very expensive to customize. However, we can give it a try to build a sample.

Thanks,
Adam

在 2019年5月21日,下午4:09,Greg DL3GJ <gjacykowski@...> 写道:

Hi Adam, congrats on fantastic product idea!

I checked the archive and did not find the answer so created new topic: did you consider making a 6m version of the D4D TRX? As most of the traffic on the "magic band" is FT8 it would be perfect device to take for travel - combined with Raspberry Pi and small, portable antenna... If possible - one for me please!

73 de DL3GJ Greg

Re: D4D: First Shipment

Adam Rong
 

Folks,

I have updated PayPal with all the tracking numbers. Orders on May 18 and later will be shipped next Monday. I shipped by post office with tracking, so you can track it on your local post office web site in a few days. For instance, US guys can track on USPS tracking site at 

You can also track on EMS web site in China here:

Normally it will take 10-20 days, so give it some patience and you will get it anyway.

Thanks,
Adam


On Tue, May 21, 2019 at 9:19 AM Adam Rong via Groups.Io <rongxh=gmail.com@groups.io> wrote:
Folks,

I just shipped three boxes yesterday to my shipping agent and today they will ship to worldwide. The backlog is not cleared so I will ship some more next Monday. After shipping, I will update tracking number in PayPal.

The full manual preview draft is already in the files section. I will take time to improve it this week. You will see a brand new version when you get the kit.

Thanks,
Adam




--
Thanks,
Adam Rong

Re: IMD performance of D4D

Adam Rong
 

Gang,

Follow up on this IMD topic:

Two domestic customers reported that D4D won't work with automatic tuner very well. One customer fixed it by switching off power supply of the tuner, the other has no fix yet. I guess it is related with IMD products. The automatic tuner will detect signal frequency and tune to the best point, but with strong IMD products, the auto tuner just failed to work.

Thanks,
Adam

Re: D4D for 6m band?

k5dez@...
 

I got the idea from a Youtuber....(TRXBench) and tried it on a cheap Xverter and it seems to work OK. Why not try soldering a PTC resistor to the crystal to help stabilize it? It would be a very cheap TCXO.....It would NOT be an industry standard of course but  it might work well enough. Just a thought.
Tim - K5DEZ

Re: D4D for 6m band?

Adam Rong
 

Tim,

Thanks, this is something that we can do. 

Thanks,
Adam

On Wed, May 22, 2019 at 7:17 AM <k5dez@q.com> wrote:
I got the idea from a Youtuber....(TRXBench) and tried it on a cheap Xverter and it seems to work OK. Why not try soldering a PTC resistor to the crystal to help stabilize it? It would be a very cheap TCXO.....It would NOT be an industry standard of course but  it might work well enough. Just a thought.
Tim - K5DEZ



--
Thanks,
Adam Rong

New file uploaded to crkits@groups.io

crkits@groups.io Notification <crkits+notification@...>
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the crkits@groups.io group.

File: D4D kit manual 0523.pdf

Uploaded By: Adam Rong

Description:
2nd preview version of D4D full manual. A lot of information and photos are added. This is very close to the formal release in a few days.

You can access this file at the URL:
https://groups.io/g/crkits/files/D4D%20Kit%20Documentations/D4D%20kit%20manual%200523.pdf

Cheers,
The Groups.io Team

Re: IMD performance of D4D

Jim
 
Edited

The D4D works great with my LDG Z-817 auto antenna tuner. 

73!

Jim - KH2SR

Re: IMD performance of D4D

Jim
 

Should jumper wires be installed in place of C20 & C23 after they are removed?

Re: IMD performance of D4D

Adam Rong
 

No. Otherwise it will short the coils.

Thanks,
Adam

在 2019年5月23日,上午4:57,Jim <KH2SR@...> 写道:

Should jumper wires be installed in place of C20 & C23 after they are removed?

Re: D4D for 6m band?

Adam Rong
 

Folks,

I did ask my crystal supplier about the possibility to customize an AT cut crystal for 50.313MHz. The answer is no, not even for an overtone type. It seems that a simple crystal controlled radio is not possible for 6m.

Thanks,
Adam

在 2019年5月22日,上午7:54,Adam Rong via Groups.Io <rongxh@...> 写道:

Tim,

Thanks, this is something that we can do. 

Thanks,
Adam

On Wed, May 22, 2019 at 7:17 AM <k5dez@q.com> wrote:
I got the idea from a Youtuber....(TRXBench) and tried it on a cheap Xverter and it seems to work OK. Why not try soldering a PTC resistor to the crystal to help stabilize it? It would be a very cheap TCXO.....It would NOT be an industry standard of course but  it might work well enough. Just a thought.
Tim - K5DEZ



--
Thanks,
Adam Rong

D4D: Test 30m JS8CALL

Adam Rong
 

Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam

Re: D4D: Test 30m JS8CALL

John M
 

Planning on it in 14 to 30 days. 
:-)

On Fri, May 24, 2019 at 12:24 PM Adam Rong <rongxh@...> wrote:
Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam