Date   
Re: Field Day Equipment of D4D and Raspberry Pi

Adam Rong
 

Folks,

I just posted to YouTube with some editing:
https://youtu.be/la6BSmRS0k0

Thanks,
Adam

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 Assembly Manual Rev.B.pdf

Uploaded By: Adam Rong

Description:
This version Rev.B is the update of the full manual in modifications and accessories sections. Also the photo quality is much better in this version. The Rev. A is now obsolete.

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

Cheers,
The Groups.io Team

Re: D4D 20m For sale

 

Still for sale 40$ shipped.

Re: D4D 20m For sale

 

Some pics

Re: D4D 20m For sale

Adam Rong
 

Well built.

Thanks,
Adam

在 2019年6月18日,上午11:56,N8DAH <Dherron@...> 写道:

Some pics
<20190617_213412.jpg>
<20190617_213320.jpg>

D4D: Quarterly Contest in 2019

Adam Rong
 

Folks,

After you've done your build, you are encouraged to put into use and report your distance of QSO with a screen snapshot of the software (WSJT-x or JTDX) in this thread. The longest distance QSO so far was made by BG7IKK with an Italian station and the distance is over 9000km with his 20m D4D, per his report in D4D WeChat group.

The contest will be quarterly based and the first place will be awarded a D4D kit. As this quarter ends soon, the first contest ends September 30. I wish to continue the test in Q4 and will send total 2 free kits this year. Wish you good luck.

Thanks,
Adam

Re: D4D: Quarterly Contest in 2019

John M
 

Adam, 

I received the kit, but life (as it does) has gotten in the way of my hobby. 

I will I’ll be building it soon, and will report back on the quality of the instructions, and my contacts with the kit.

73

John McGrath
KF6EFG

Re: D4D: Quarterly Contest in 2019

Adam Rong
 

Sounds good, John. You are one of the earliest buyers and I wish you good luck with your build and contest.

Thanks,
Adam

在 2019年6月20日,上午8:19,John M <kf6efg@...> 写道:

Adam, 

I received the kit, but life (as it does) has gotten in the way of my hobby. 

I will I’ll be building it soon, and will report back on the quality of the instructions, and my contacts with the kit.

73

John McGrath
KF6EFG

Re: D4D: Quarterly Contest in 2019

Adam Rong
 

Folks,

This is the 1st place so far:

Thanks,
Adam

在 2019年6月20日,上午8:06,Adam Rong via Groups.Io <rongxh@...> 写道:

Folks,

After you've done your build, you are encouraged to put into use and report your distance of QSO with a screen snapshot of the software (WSJT-x or JTDX) in this thread. The longest distance QSO so far was made by BG7IKK with an Italian station and the distance is over 9000km with his 20m D4D, per his report in D4D WeChat group.

The contest will be quarterly based and the first place will be awarded a D4D kit. As this quarter ends soon, the first contest ends September 30. I wish to continue the test in Q4 and will send total 2 free kits this year. Wish you good luck.

Thanks,
Adam

Z-match Antenna Tuner on Choc perfboard

Adam Rong
 

Folks,

This is my work this weekend.

https://mp.weixin.qq.com/s/ehBss8YBT0Y8z2WMg5oKpA


Thanks,
Adam

Re: Z-match Antenna Tuner on Choc perfboard

AA7US
 

Nice work Adam!

John
AA7US

BC breakthrough

Trent Trent
 

I just made my first and fuckin LAST crkits 20M FT8 transceiver,i've done most of it on the TX side and as I done the RX side which it is missing the needed 27p cap all I get is fuckin BC from ABC radio here in VK7 no matter what I do

Re: BC breakthrough

Bruce
 

Wow a little angry there.  Part of this hobby is fixing problems as they come up. A 27pf cap is a jelly bean part which can be purchased at any supply house. If you don't want to purchase one, harvest one from something else. It's a simple problem, quit your cussing and figure it out.

Re: BC breakthrough

Adam Rong
 

Trent,

BCI is the nature of a direct conversion receiver. The crystal and the 27p cap in the front end will help reduce it, however I did receive a BCI report from Beijing where the MW broadcast station is nearby, after selling over 100 kits. An additional BCI filter inserted between antenna and the D4D will be helpful. If you can confirm MW station is the major problem, you can consider making one following this page:
http://www.calculatoredge.com/electronics/ch%20pi%20high%20pass.htm

Thanks,
Adam

在 2019年6月25日,上午11:10,Trent Trent <vk7hrs@...> 写道:

I just made my first and fuckin LAST crkits 20M FT8 transceiver,i've done most of it on the TX side and as I done the RX side which it is missing the needed 27p cap all I get is fuckin BC from ABC radio here in VK7 no matter what I do

Re: BC breakthrough

Trent Trent
 

Where I am the nearest AM BC antenna is over 50K away so I have nothing near me onAM


On Tue, 25 Jun 2019 at 21:26, Adam Rong <rongxh@...> wrote:
Trent,

BCI is the nature of a direct conversion receiver. The crystal and the 27p cap in the front end will help reduce it, however I did receive a BCI report from Beijing where the MW broadcast station is nearby, after selling over 100 kits. An additional BCI filter inserted between antenna and the D4D will be helpful. If you can confirm MW station is the major problem, you can consider making one following this page:
http://www.calculatoredge.com/electronics/ch%20pi%20high%20pass.htm

Thanks,
Adam

在 2019年6月25日,上午11:10,Trent Trent <vk7hrs@...> 写道:

I just made my first and fuckin LAST crkits 20M FT8 transceiver,i've done most of it on the TX side and as I done the RX side which it is missing the needed 27p cap all I get is fuckin BC from ABC radio here in VK7 no matter what I do

Re: BC breakthrough

gm0sim@...
 

I still think that a $39 kit that fits in a cigarette packet sized box as a cheap introduction to FT8 is a valid and useful product for many (OK not all but you have to accept some compromises for that price/size).

Surely that is the whole point of AMATEUR radio... self training & the ability to investigate and resolve problems yourself.

Although... who should I complain to about the state of the ionosphere at the moment... that is just not on 🙁

regards- Ian gm0sim


From: crkits@groups.io <crkits@groups.io> on behalf of Trent Trent <vk7hrs@...>
Sent: 25 June 2019 04:10
To: crkits@groups.io
Subject: [crkits] BC breakthrough
 
I just made my first and fuckin LAST crkits 20M FT8 transceiver,i've done most of it on the TX side and as I done the RX side which it is missing the needed 27p cap all I get is fuckin BC from ABC radio here in VK7 no matter what I do

Re: BC breakthrough

Adam Rong
 

Folks,

I agree that problem solving is part of Amateur Radio, especially dealing with BCI. However, as the designer and kit provider, I should have made it clear that this is something new and people may meet problems.

Perhaps it is good idea to find the source of the interference first. I did a web search and found the following stations in Hobart, Tasmania very near you:
ABC Radio 936kHz
ABC RN 585kHz
ABC News on Radio 747kHz

Compare with an AM radio receiver and you will find out the possible source of interference. If you are not sure about the finding, perhaps you can contact ABC to know the frequency list and distance of the interference, including LW, MW and SW, so you can insert a band stop or other type of filter.

Personally I have a similar experience to identify a strong BCI and finally found the source of the noise. It is a lot of fun indeed and it is good for you as you can start to try many more kits of direction conversion type later.

I appreciate all the feedback and I think it is part of the experience of providing the kit. Let me know if you need me to ship the missing part. As I am getting 42, I start to forget something. If you need me to refund to cover the postage and cost of sourcing locally, I will be glad to do so. A happy customer is more important, always.

Thanks,
Adam

Re: BC breakthrough

Zach Davis - AB0E
 

For the 20m kit which do you all think would be better a MW bandstop or a 20m Bandpass?

Re: BC breakthrough

 

A simple BCI filter on the RX path would solve this issue.

 

Re: Z-match Antenna Tuner on Choc perfboard

Adam Rong
 

Thanks John. I just made the first QSO with the Z-match tuner and my dorm EFHW. It works just fine.

Thanks,
Adam