Date   
Why D4D is a serious rig?

Adam Rong
 

Folks,

Do you think a 100W SSB commercial rig is a serious one? If yes, let's see why D4D is serious as well.

Human ears can hear 6dB-10dB Signal to Noise Ratio when we do SSB QSO. However, FT8 can decode -24dB SNR. It is at least 30dB difference and it will translate to 100W vs. 0.1W. Now D4D can transmit 1W and only half of it will be effective, so it is 0.5W FT8 and it translates to 500W SSB. So, do you think a 500W SSB rig a serious one? It explains why over 9000km QSO can be achieved.

Thanks,
Adam

Re: Preliminary Specifications of 6-60m 100W Coil Dipole Antenna

Charlie Vest
 

Adam ,

I have 50 meters overall distance to use for a dipole , so it will not be a problem .

Thanks ,

Charlie

On July 1, 2019 at 9:57 AM Adam Rong <rongxh@...> wrote:

Charlie,

It is a full length dipole so the overall length would be somewhere at 30m for 60m band. If your space is not enough, you can consider an inverted V.

As the name Gipsy shows, it is better for mobile usage. 

Thanks,
Adam

 

Re: Photos of Mini Wire Antenna Sample Build

Adam Rong
 

Folks,

I will receive all the parts this weekend and will ship a few kits. Please place email order at 12 USD each plus 5 USD each time for shipping.

The PCB will be compatible for these applications using a toroid FT-63-43:
BALUN 1:1
BALUN 4:1
UNUN 49:1
UNUN 9:1

Thanks,
Adam

Re: Photos of Mini Wire Antenna Sample Build

Adam Rong
 

Folks,

This is the formal version.
https://mp.weixin.qq.com/s/CyMkfWmNQ0g6Q_O4aKLNvA

Thanks,
Adam

Re: Photos of Mini Wire Antenna Sample Build

Adam Rong
 

 

Folks,

The manual is being written. It takes a week or so.

Thanks,
Adam

Mini Wire Antenna

Kit Assembly Manual

 

Draft

CRKITS.COM

 

The Mini Wire Antenna can be used with D4D DSB Transceiver for FT8, HT-1A CW Transceiver and other QRP power level transceivers. It is tiny and light weight. You will need to supply the wire and coaxial cable by yourself since the shipping cost is high. The max OD for wire is 3mm, but it works great for thinner wire.

 

Applications

  • 49:1 or 64:1 UNUN for EFHW

  • 9:1 UNUN for Long Wire

  • 1:1 BALUN for Dipole

  • 4:1 BALUN or UNUN

  • and etc...

 

Part List

  • 1x BNC connector with washer and nut

  • 1x 100p capacitor

  • 1x Toroid Material -43 OD 16mm (Manufactured by Fair-Rite)

  • Enameled Wires

    • 60cm 0.7mm OD Red

    • 60cm 0.7mm OD Shining Golden

    • 60cm 0.7mm OD Dark Golden

  • 5x Cable Tie

  • 1x Main PCB

  • 2x Insulator PCB

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: MiniWireAntennaManualDraft.pdf

Uploaded By: Adam Rong

Description:
The first draft of Mini Wire Antenna Kit Assembly Manual. Work In Progress.

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

Cheers,
The Groups.io Team

D4D: Kit Assembly Manual Updated to Rev. C

Adam Rong
 

Folks,

I have added a few important items in this new revision. Such as:
1. In accessories section, I have added Mini Wire Antenna and other newly added accessories/options.
2. In modifications section, I have highlighted a simpler IMD modification in modification 5.
3. In FAQ, I have added one more Q&A about the possible discussion about the new mode FT8 with DSB transceiver.

You can download from here:
https://groups.io/g/crkits/files/D4D%20Kit%20Documentations

Thanks,
Adam

Re: D4D: Kit Assembly Manual Updated to Rev. C

Trent Trent
 

Is there any plans to take out the LPF in the kits and do BPF instead?


On Tue, 9 Jul 2019 at 01:56, Adam Rong <rongxh@...> wrote:
Folks,

I have added a few important items in this new revision. Such as:
1. In accessories section, I have added Mini Wire Antenna and other newly added accessories/options.
2. In modifications section, I have highlighted a simpler IMD modification in modification 5.
3. In FAQ, I have added one more Q&A about the possible discussion about the new mode FT8 with DSB transceiver.

You can download from here:
https://groups.io/g/crkits/files/D4D%20Kit%20Documentations

Thanks,
Adam

Re: BC breakthrough

david todd
 

trent, 
sounds like you solved your problem bpf.But before building one, 

why dont you put the rig in some shielding and build an inline filter before the rig?maybe install some caps to ground?

maybe .o1 uf ceramics to ground? i have built mine today and it receives  fine. took it mobiling with me   i dont have this problem.But they probably dont run the freqs yours does.
 
I physically connected a ground wire to the case of my radio and hooked it up to the nearest ground connection which at home is the 8 ft triad ground rods i have driven into the dirt for other equipment.Not only do i have an antenna ground i have an earth ground too to the case of the radio.it really reduced the noise in my receiver..

I started out with an old johnson viking tube rig with an s38b receiver. :). I ground everything including my wife from my bank account hi hi. one wire with a ring connector or fork if you dont have the ring. or rap the ground wire around the screw and tighten. see if that helps.

Re: D4D: Kit Assembly Manual Updated to Rev. C

Adam Rong
 

No plan but you can consider modifying by yourself.

在 2019年7月10日,上午7:24,Trent Trent <vk7hrs@...> 写道:

Is there any plans to take out the LPF in the kits and do BPF instead?

On Tue, 9 Jul 2019 at 01:56, Adam Rong <rongxh@...> wrote:
Folks,

I have added a few important items in this new revision. Such as:
1. In accessories section, I have added Mini Wire Antenna and other newly added accessories/options.
2. In modifications section, I have highlighted a simpler IMD modification in modification 5.
3. In FAQ, I have added one more Q&A about the possible discussion about the new mode FT8 with DSB transceiver.

You can download from here:
https://groups.io/g/crkits/files/D4D%20Kit%20Documentations

Thanks,
Adam



Out of town until July 20

Adam Rong
 

Folks,

I am out of town until July 20. During this period, I can take orders but cannot ship D4D kit or Mini Wire Antenna kit, but I still can arrange shipment for HT-1A, R3500D and 6-60m coil dipole antenna. Appreciate for your understanding.

Thanks,
Adam

D4D: Go mobile with Raspberry Pi

Adam Rong
 

Folks,

I suppose you have seen the video "Field Test: D4D and Pi" at my web store http://crkits.com. We Chinese hams have a WeChat discussion group about it and we have achieved several successes putting together this configuration.

You will need:
1x D4D radio that you can build by yourself from the kit which you can purchase from http://crkits.com
2x Audio cables come from D4D kit
1x USB sound card that you can purchase from http://crkits.com
1x Raspberry Pi Model 3B or higher with WiFi. In order to get it running, you will need a micro SD card, and a USB power supply cable. LCD display is not needed, as we will use VNC or TeamViewer to remote control by WiFi
1x Li-Ion power bank for both 12V >0.5A (for D4D) and 5V >2.0A (for Pi) output and a DC cable for D4D. If you cannot get it, you can work out your own solution
1x EFHW antenna (you can purchase the Mini Wire Antenna kit from http://crkits.com as it is a perfect match for D4D) or a dipole antenna like 6-60m Coil Dipole Antenna or other antennas you may have on hand
1x Your cell phone with Internet Sharing to your Raspberry Pi

Software on Pi:
You will need to install WSJT-x Raspberry Pi version. The latest version is  wsjtx_2.1.0_armhf.deb
If you would like to use JTDX instead, you can try this JTDX v2.0.1-rc138
VNC host is by default installed, but if you find it not compatible, you can try TeamViewer. Remember to start service at power on
Setup the WiFi after your cell phone shares the Internet

Software on your cell phone:
VNC client or TeamViewer client
You will need to share your Internet to Pi

Please share your experience setting up these hardware and software. Here we Chinese hams love this very much as the whole configuration is so portable.

Thanks,
Adam

New Record: D4D QSO Distance

Adam Rong
 

Folks,

Still remember the quarterly contest? Last time the 1st place was BG7IKK. He made a QSO from Guangzhou China to Italy with distance over 9000km. Today he refreshed by a QSO with W4UAT with distance of 11233km. He got report of -19dB!

His rig is our D4D 20m and the antenna is an EFHW.

You still have chance to win the contest before the deadline of the end of September. Show us your QSO!

Thanks,
Adam

Re: New Record: D4D QSO Distance

AOLMemberServiceBOBAF2DX
 

Adam,
What is the power f tat rig?>/.
BOB AF2DX


-----Original Message-----
From: Adam Rong <rongxh@...>
To: crkits <crkits@groups.io>
Sent: Thu, Jul 18, 2019 8:14 am
Subject: [crkits] New Record: D4D QSO Distance

Folks,

Still remember the quarterly contest? Last time the 1st place was BG7IKK. He made a QSO from Guangzhou China to Italy with distance over 9000km. Today he refreshed by a QSO with W4UAT with distance of 11233km. He got report of -19dB!

His rig is our D4D 20m and the antenna is an EFHW.

You still have chance to win the contest before the deadline of the end of September. Show us your QSO!

Thanks,
Adam

Re: New Record: D4D QSO Distance

Adam Rong
 

Bob,

It is less than one watt DSB mode for 20m band.

Thanks,
Adam

在 2019年7月18日,下午8:36,AOLMemberServiceBOBAF2DX via Groups.Io <beargyrils@...> 写道:

Adam,
What is the power f tat rig?>/.
BOB AF2DX


-----Original Message-----
From: Adam Rong <rongxh@...>
To: crkits <crkits@groups.io>
Sent: Thu, Jul 18, 2019 8:14 am
Subject: [crkits] New Record: D4D QSO Distance

Folks,

Still remember the quarterly contest? Last time the 1st place was BG7IKK. He made a QSO from Guangzhou China to Italy with distance over 9000km. Today he refreshed by a QSO with W4UAT with distance of 11233km. He got report of -19dB!

His rig is our D4D 20m and the antenna is an EFHW.

You still have chance to win the contest before the deadline of the end of September. Show us your QSO!

Thanks,
Adam

Re: New Record: D4D QSO Distance

AOLMemberServiceBOBAF2DX
 

Hi Adam,
OK thanks so much.
Nice to hear QRPp is still ok for dx.
New QTH is just steps away from the ocean but just to hot now.
When it cools down I will be back on with an end fed running 5 watts.
73 
BOB AF2DX


-----Original Message-----
From: Adam Rong <rongxh@...>
To: crkits <crkits@groups.io>
Sent: Thu, Jul 18, 2019 9:06 am
Subject: Re: [crkits] New Record: D4D QSO Distance

Bob,

It is less than one watt DSB mode for 20m band.

Thanks,
Adam

在 2019年7月18日,下午8:36,AOLMemberServiceBOBAF2DX via Groups.Io <beargyrils@...> 写道:

Adam,
What is the power f tat rig?>/.
BOB AF2DX


-----Original Message-----
From: Adam Rong <rongxh@...>
To: crkits <crkits@groups.io>
Sent: Thu, Jul 18, 2019 8:14 am
Subject: [crkits] New Record: D4D QSO Distance

Folks,

Still remember the quarterly contest? Last time the 1st place was BG7IKK. He made a QSO from Guangzhou China to Italy with distance over 9000km. Today he refreshed by a QSO with W4UAT with distance of 11233km. He got report of -19dB!

His rig is our D4D 20m and the antenna is an EFHW.

You still have chance to win the contest before the deadline of the end of September. Show us your QSO!

Thanks,
Adam

D4D

Bryan Brauer
 

How would the D4D pair with a 10 watt linear amplifier like the kit offered by QRP Labs?

Bryan B. Brauer, PE
Consulting Engineer

Re: D4D

Adam Rong
 

Bryan,

It is not recommended as the DSB signal spectrum is not clear due to Inter-Modulation Distortion. It may cause serious adjacent channel interference if you add a PA. Personally I think 1-watt is more than enough for FT8, especially for 20m. BG7IKK already achieved 2 QSO's over 9000km.

Thanks,
Adam

On Thu, Jul 18, 2019 at 11:00 PM Bryan Brauer <bryan@...> wrote:
How would the D4D pair with a 10 watt linear amplifier like the kit offered by QRP Labs?

Bryan B. Brauer, PE
Consulting Engineer



--
Thanks,
Adam Rong

Re: New Record: D4D QSO Distance

Beat Luethy
 

Hi Adam

 

DSB Tx works perfect!
My first QSO with 1 Watt was HB to Spain (EA) abt 1700km!
Very surprising also with the actual condx.

 

73s Beat/HB9CRE

 

Von: crkits@groups.io [mailto:crkits@groups.io] Im Auftrag von Adam Rong
Gesendet: Donnerstag, 18. Juli 2019 15:06
An: crkits@groups.io
Betreff: Re: [crkits] New Record: D4D QSO Distance

 

Bob,

 

It is less than one watt DSB mode for 20m band.

Thanks,

Adam


2019718日,下午8:36AOLMemberServiceBOBAF2DX via Groups.Io <beargyrils@...> 写道:

Adam,

What is the power f tat rig?>/.

BOB AF2DX

-----Original Message-----
From: Adam Rong <rongxh@...>
To: crkits <crkits@groups.io>
Sent: Thu, Jul 18, 2019 8:14 am
Subject: [crkits] New Record: D4D QSO Distance

Folks,

 

Still remember the quarterly contest? Last time the 1st place was BG7IKK. He made a QSO from Guangzhou China to Italy with distance over 9000km. Today he refreshed by a QSO with W4UAT with distance of 11233km. He got report of -19dB!

 

His rig is our D4D 20m and the antenna is an EFHW.

 

You still have chance to win the contest before the deadline of the end of September. Show us your QSO!

 

Thanks,

Adam

 

 

Virenfrei. www.avast.com

Re: New Record: D4D QSO Distance

Adam Rong
 

Folks,

Thanks for letting me know. I had thought you guys all haven't had chance to take a look at the kit yet :-D

Thanks,
Adam

On Thu, Jul 18, 2019 at 11:07 PM Beat Luethy <beat.luethy@...> wrote:

Hi Adam

 

DSB Tx works perfect!
My first QSO with 1 Watt was HB to Spain (EA) abt 1700km!
Very surprising also with the actual condx.

 

73s Beat/HB9CRE

 

Von: crkits@groups.io [mailto:crkits@groups.io] Im Auftrag von Adam Rong
Gesendet: Donnerstag, 18. Juli 2019 15:06
An: crkits@groups.io
Betreff: Re: [crkits] New Record: D4D QSO Distance

 

Bob,

 

It is less than one watt DSB mode for 20m band.

Thanks,

Adam


2019718日,下午8:36AOLMemberServiceBOBAF2DX via Groups.Io <beargyrils@...> 写道:

Adam,

What is the power f tat rig?>/.

BOB AF2DX

-----Original Message-----
From: Adam Rong <rongxh@...>
To: crkits <crkits@groups.io>
Sent: Thu, Jul 18, 2019 8:14 am
Subject: [crkits] New Record: D4D QSO Distance

Folks,

 

Still remember the quarterly contest? Last time the 1st place was BG7IKK. He made a QSO from Guangzhou China to Italy with distance over 9000km. Today he refreshed by a QSO with W4UAT with distance of 11233km. He got report of -19dB!

 

His rig is our D4D 20m and the antenna is an EFHW.

 

You still have chance to win the contest before the deadline of the end of September. Show us your QSO!

 

Thanks,

Adam

 

 

Virenfrei. www.avast.com



--
Thanks,
Adam Rong