Date   
DSB transceiver for Digital mode

Adam Rong
 

May I call it D4D - DSB transceiver for Digital mode? This 1-watt DSB transceiver will provide lots of fun of building and operating. The VOX circuit will provide even more convenience to the operator. Thanks to the strong capability of digital mode and computer, this rig is not a toy. You can easily make FT8 contacts of 300-1500 miles range with a moderate antenna like full sized dipole  or EFHW.

The photos are for the prototype based on CRK-10A enclosure. It looks quite close to the final version. We will run testing in the following weeks. The initial test looks promising. We plan to take orders in about a month. We will start with 7074 version for FT8. The price will be very reasonable. Stay tuned and spread the word if you guys are interested.



Thanks,
Adam

Re: Simple FT8 DSB rig

Adam Rong
 

Ron,

The 20-meter version will be announced later. Why a version without an enclosure? Do you plan to integrate to a big system?

Thanks,
Adam

Re: Simple FT8 DSB rig

Ron Stone
 

Adam,

Thanks for your response.  I was thinking of combining it with a Raspberry PI and batteries in a single enclosure for portable use, and use my phone for the UI.

73,

Ron (KA3J)

Re: Simple FT8 DSB rig

Adam Rong
 

Sounds like a good idea. Here we have a ham already tested this system okay.

Thanks,
Adam

Re: Simple FT8 DSB rig

Furtuna Mircea
 

Adam -An excellent idea for this mini transceiver.
If the price will be competitive, it will be a great success.

I do not have crystals for those frequencies, otherwise I try a replica.
Mircea-(YO9IOF)

Re: Simple FT8 DSB rig

Adam Rong
 

Thanks Mircea,

The price will be competitive of course. I hope more people can enjoy this tiny radio for portable/mobile operation. I will return home tomorrow after a 10-day trip to restart the test. I should be able to ship in 5 weeks.

Thanks,
Adam

On Wed, Apr 17, 2019 at 1:46 PM Furtuna Mircea via Groups.Io <mircea99fm=yahoo.com@groups.io> wrote:
Adam -An excellent idea for this mini transceiver.
If the price will be competitive, it will be a great success.

I do not have crystals for those frequencies, otherwise I try a replica.
Mircea-(YO9IOF)



--
Thanks,
Adam Rong

EOL: CRK-10A CW Transceiver Kit

Adam Rong
 

Folks,

This is to announce the EOL for CRK-10A CW Transceiver Kit. You might find some left at my distributors but I have zero in stock now.

I will focus on HT-1A dual band CW transceiver, R3500D ARDF receiver and the upcoming DSB transceiver kit for Digital mode (model: D4D).

--
Thanks,
Adam Rong

Re: Simple FT8 DSB rig

Ron Stone
 

Adam,

What do you think of going SSB instead of DSB at least for the transmitter?  I believe this would just involve the addition of a simple 3 pole crystal filter and an additional SA612 mixer circuit - not many components at all.  Suitable crystals for 20 meters are readily available - 4 MHz for the crystal filter and 10,073 MHz for the mixer (or 4 MHz and 3.072 MHz for 40 meters) which would just have to be pulled slightly.  This approach would double the effective power and also keep the channel cleaner - i.e., avoid the unnecessary LSB signal.

73,

Ron (KA3J)

Re: EOL: CRK-10A CW Transceiver Kit

gm0sim@...
 

I fully appreciate the reasoning and economics of this but it will still be missed.... it was a well loved classic.... keep up the good work & many thanks

ian.... gm0sim


From: crkits@groups.io <crkits@groups.io> on behalf of Adam Rong <rongxh@...>
Sent: 19 April 2019 17:16
To: crkits@groups.io
Subject: [crkits] EOL: CRK-10A CW Transceiver Kit
 
Folks,

This is to announce the EOL for CRK-10A CW Transceiver Kit. You might find some left at my distributors but I have zero in stock now.

I will focus on HT-1A dual band CW transceiver, R3500D ARDF receiver and the upcoming DSB transceiver kit for Digital mode (model: D4D).

--
Thanks,
Adam Rong

Re: EOL: CRK-10A CW Transceiver Kit

Adam Rong
 

Thanks Ian. Check out HT-1A and you will love it too.

On Sat, Apr 20, 2019 at 6:48 AM <gm0sim@...> wrote:
I fully appreciate the reasoning and economics of this but it will still be missed.... it was a well loved classic.... keep up the good work & many thanks

ian.... gm0sim


From: crkits@groups.io <crkits@groups.io> on behalf of Adam Rong <rongxh@...>
Sent: 19 April 2019 17:16
To: crkits@groups.io
Subject: [crkits] EOL: CRK-10A CW Transceiver Kit
 
Folks,

This is to announce the EOL for CRK-10A CW Transceiver Kit. You might find some left at my distributors but I have zero in stock now.

I will focus on HT-1A dual band CW transceiver, R3500D ARDF receiver and the upcoming DSB transceiver kit for Digital mode (model: D4D).

--
Thanks,
Adam Rong



--
Thanks,
Adam Rong

FT8 DSB VOX

John Kirby
 

Adam,

 Love your FT8 DSB VOX concept

Can't wait for a kit

72 73
John
N3AAZ
FM19

Re: DSB transceiver for Digital mode

Adam Rong
 

Folks,

Let’s use this thread to update the status. The test is done. I have tested both 7074 and 14074 radios. I need to update PCB to include a minor fix.

I will accept order and start to ship after Hamvention in May. I have lots of work to do considering my limited spare time.

Compared with the open schematic, I have modified several areas to improve TX signal purity and frequency stability. The added VOX circuit works as planned. I understand now that the DSB circuit concept I have adopted has some potential issue to cause self-oscillating. It seems that my fix is effective and still simple.

I can build this kit in a bit more than one hour. If you take time, you can enjoy a whole evening to build and test this rig. I have to standardize the name of this rig: D4D, no matter what it was called, either DSB FT8 BD6CR, FT8 DSB VOX or else.

Thanks,
Adam

在 2019年4月10日,上午8:03,Adam Rong via Groups.Io <rongxh@...> 写道:

May I call it D4D - DSB transceiver for Digital mode? This 1-watt DSB transceiver will provide lots of fun of building and operating. The VOX circuit will provide even more convenience to the operator. Thanks to the strong capability of digital mode and computer, this rig is not a toy. You can easily make FT8 contacts of 300-1500 miles range with a moderate antenna like full sized dipole  or EFHW.

The photos are for the prototype based on CRK-10A enclosure. It looks quite close to the final version. We will run testing in the following weeks. The initial test looks promising. We plan to take orders in about a month. We will start with 7074 version for FT8. The price will be very reasonable. Stay tuned and spread the word if you guys are interested.

<WechatIMG16.jpeg><WechatIMG17.jpeg>

Thanks,
Adam

Re: Simple FT8 DSB rig

Adam Rong
 

Ron,

I built a SSB FT8 radio based on my KN-Q7A PCB and it works okay. If you check out my previous post, I even added a VOX circuit for this rig.

However this SSB concept is very common, and I am trying something new. The result is very promising and the unwanted LSB band is not so harmful as the power is QRPP level.

Thanks,
Adam

Re: FT8 DSB VOX

John Kirby
 

 Adam,

Modified RockMite 40 (7030), no VOX yet, for simplex FT8 DSB to shack FT991 :>)

Anxious waiting to learn your LSB suppression technique!

TNX AGN
72 73
John
N3AAZ

Re: FT8 DSB VOX

Adam Rong
 

John,

Looks good. How did you modify your RockMite 40 to transmit DSB?

My technique is just to live with it as the signal is QRPp level, hihi.

Thanks,
Adam

在 2019年4月21日,下午6:49,John Kirby <n3aaz_qrp_1@...> 写道:

 Adam,

Modified RockMite 40 (7030), no VOX yet, for simplex FT8 DSB to shack FT991 :>)

Anxious waiting to learn your LSB suppression technique!

TNX AGN
72 73
John
N3AAZ
<20190420_170232.jpg>
<20190420_165627.jpg>

Re: DSB transceiver for Digital mode

Jim
 

Would it be possible to make this rig operate on the JS8CALL frequency of 7.078 instead? 

Re: FT8 DSB VOX

John Kirby
 

Adam,

My RockMite mod for FT8 DSB (NOVOX (yet hi hi))

John
N3AAZ

Re: FT8 DSB VOX

John Kirby
 
Edited

ps ...

Q2 has no FT8 function (yet)

John N3AAZ

Re: FT8 DSB VOX

Adam Rong
 

Good job on the modification. It saves $ and time.

I sent 4 kits to domestic hams based on the first version PCB, and 3 of them completed the building, although they did have a few questions and mistakes.  1 more person will start building tomorrow. 2 of them logged QSO’s so far and 2 of them told me they got about 2 watts when it is powered by 13.8V. 1 of them told me the design is mature, so I will start PCB massive production tomorrow.

Thanks,
Adam

在 2019年4月21日,下午11:53,John Kirby <n3aaz_qrp_1@...> 写道:

Adam,

My RockMite mod for FT8 DSB (NOVOX (yet hi hi))

John
N3AAZ
<20190421_113518.jpg>

Re: DSB transceiver for Digital mode

Adam Rong
 

Technically it is possible. Just change the crystal and I might be able to customize it. However, we will need to consider the unwanted LSB signal will go into FT8 spectrum and it might cause interference although the power is still QRPp level.

If we want to experiment, just pull high the crystal a bit to see how high it can go, maybe 7075 or 7076 but not easy to get 7078 for a HC49S holder crystal.

Thanks,
Adam

在 2019年4月21日,下午10:39,Jim <KH2SR@...> 写道:

Would it be possible to make this rig operate on the JS8CALL frequency of 7.078 instead?