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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
 

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


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

Ron Stone
 

Adam,

Very good.  I was under the impression that you were just doing a 40 Meter version of this rig.  Sounds like you're planning to do a 20 Meter version as well.  Any chance, you'll sell a version that does not include an enclosure?

73,

Ron (KA3J)


Re: Simple FT8 DSB rig

Adam Rong
 

Ron,

A kit is being designed based on this circuit. I will announce in a month or two. You will likely see the prototype in digital mode forum in Hamvention this May.

Thanks,
Adam

在 2019年3月29日,上午7:39,Ron Stone <rsstone2@...> 写道:

Adam - Would love to see the schematic for this baby and your other 20 meter version too.  Thanks!

Ron (KA3J)


Re: Simple FT8 DSB rig

Ron Stone
 

Adam - Would love to see the schematic for this baby and your other 20 meter version too.  Thanks!

Ron (KA3J)


Re: FT8 HT

AA7US
 

Great idea Adam!

I'm looking forward to it.

73,

John
AA7US


Re: FT8 HT

Adam Rong
 

Folks,

Thanks for encouragement from many hams. I have decided to make it a kit to include more features including:
1. VOX control
2. Better spectrum purity
3. Better frequency stability
4. A metal case like CRK-10A
5. Still low cost and easy to build
6. Support MacBook and other modern laptops to detect it as an external mic and speaker
7. Wide power supply range 7.4~15V (about 180~350mA, and about 0.3~1.8W output)

As I am still busy with my work, I have asked a guru to design the kit for me. I will keep you posted

Thanks,
Adam

On Mon, Mar 4, 2019 at 3:02 PM Adam Rong via Groups.Io <rongxh=gmail.com@groups.io> wrote:
Lots of fun building and operating this simple FT8 rig by manually switching RX/TX.

And here is the schematic.

Thanks,
Adam





--
Thanks,
Adam Rong


A dedicated page for simple receiver

Adam Rong
 

Folks,

JL1KRA made a dedicated page for the simple receiver I introduced earlier. The design is quite unique but the performance is acceptable regarding selectivity and sensitivity. You can give it a try and make it a club project if you wish.


HT-1A Story

Adam Rong
 


FT8 HT

Adam Rong
 

Lots of fun building and operating this simple FT8 rig by manually switching RX/TX.

And here is the schematic.

Thanks,
Adam


HT-1A review by Tech Examiner

Adam Rong
 


Simple FT8 DSB rig

Adam Rong
 

I built it on my perf board. I made the first QSO days ago with a ham 1168 miles away. It is a 20m DSB 1-watt transceiver with VOX.


Re: Yet another FT8 DSB rig

Adam Rong
 

Folks,

I managed the first QSO with this 1-watt DSB FT8 rig on 20m with a ham about 1168 miles away. The short term frequency stability is still an area for improvement due to final stage heating the crystal.


Thanks,
Adam

在 2019年1月30日,上午1:09,Adam Rong via Groups.Io <rongxh=gmail.com@groups.io> 写道:

Gang,

I followed VK3YE micro 40 and added a VOX circuit and here is the result:


Thanks,
Adam



<image1.jpeg>


Yet another FT8 DSB rig

Adam Rong
 

Gang,

I followed VK3YE micro 40 and added a VOX circuit and here is the result:


Thanks,
Adam


Add VOX to CS radio to better support FT8

Adam Rong
 

Gang,

The VOX circuit is very simple one like this:

I changed 47k to 10k to shorten the hold time.

Here is how I modified my radio (actually it is a crystal controlled FT8 radio but you can do the same for your CS radio as long as you change the mode to Upper Sided Band).
image1.jpeg
image2.jpeg
image3.jpeg
Thanks,
Adam


Re: Poor man’s FT8 transceiver

AA7US
 

Very nicely done Adam! 👍🏼

There's nothing more satisfying than completing QSO's using a transceiver you built.  Especially so for one built from scratch.

73,

John
AA7US


Poor man’s FT8 transceiver

Adam Rong
 

Gang,

I built this transceiver last weekend. It is a VOX controlled simple DSB transceiver for 14.074 MHz using crystal. It puts 500 mW and the QSO test with my TS-590S seems promising. See the photos. Just share with you guys. No plan for a kit.





Thanks,
Adam


Re: Video Upload: Build a Simple RX

Jim Burns
 

Thanks Adam and Merry Christmas !
Jim


On 8:37PM, Mon, Dec 24, 2018 Adam Rong <rongxh@... wrote:
Jim,

It depends on the load capacitor of the crystal and the mode. The normal load cap is 20 pF, and if you want to receive SSB, you will need to pick two caps to oscillate on the exact marked frequency. If you receive CW, you will need to oscillate a bit off to give you right tone pitch. In my case, I used 39 and 68 to give 700 Hz lower than 7010 crystal with 20 pF load capacitor.

Thanks,
Adam

在 2018年12月25日,上午3:32,Jim Burns <outbackerwb4ilp@...> 写道:

What value are the two caps at pins 6 & 7?
Jim WB4ILP


On 9:39AM, Sat, Dec 22, 2018 Adam Rong <rongxh@... wrote:
See this video:

Schematic:


Thanks,
Adam

<simple_rx.jpeg>


Re: Video Upload: Build a Simple RX

Adam Rong
 

Jim,

It depends on the load capacitor of the crystal and the mode. The normal load cap is 20 pF, and if you want to receive SSB, you will need to pick two caps to oscillate on the exact marked frequency. If you receive CW, you will need to oscillate a bit off to give you right tone pitch. In my case, I used 39 and 68 to give 700 Hz lower than 7010 crystal with 20 pF load capacitor.

Thanks,
Adam

在 2018年12月25日,上午3:32,Jim Burns <outbackerwb4ilp@...> 写道:

What value are the two caps at pins 6 & 7?
Jim WB4ILP


On 9:39AM, Sat, Dec 22, 2018 Adam Rong <rongxh@... wrote:
See this video:

Schematic:


Thanks,
Adam

<simple_rx.jpeg>