Re: DSB transceiver for Digital mode
80-meter 3.573MHz will be added. Crystals are being customized. Think of a 80-m radio of 1-watt to make a few QSO's? Great fun!
Thanks,
Adam
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Re: DSB transceiver for Digital mode
Hello. Cut the crystal around 1mm around the crystal, scratch the crystal very carefully, just a little, and measure it frequently. It will be a slight increase of 30 maximum 100kz. Verified method, step by step.Mircea-YO9IOF
On Wednesday, April 24, 2019, 7:46:13 PM GMT+3, Adam Rong <rongxh@...> wrote:
Folks,
I have placed order for PCB two days ago. The first batch is 350 pcs.
I have finalized the parts value and will place order for parts tomorrow. The RF output is 1-watt at 12V for 14.074MHz, and a bit bigger for 7.074MHz. The spurious suppression is better than -50dBc.
I hope to start kitting for the first 5 pcs on May 4. If it goes smoothly, I might take order to ship these kits early, so you can send a few test reports ahead of time than the usual customers. Stay tuned and I hope you will like it.
Thanks,
Adam
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Re: DSB transceiver for Digital mode
Folks,
I have placed order for PCB two days ago. The first batch is 350 pcs.
I have finalized the parts value and will place order for parts tomorrow. The RF output is 1-watt at 12V for 14.074MHz, and a bit bigger for 7.074MHz. The spurious suppression is better than -50dBc.
I hope to start kitting for the first 5 pcs on May 4. If it goes smoothly, I might take order to ship these kits early, so you can send a few test reports ahead of time than the usual customers. Stay tuned and I hope you will like it.
Thanks,
Adam
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?
Adam,
I understand and thanks for the reply
72 73
John
N3AAZ
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John,
No. I will keep the schematic paper based only for customers for a period of time.
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Adam,
Sounds good !
Will you release the schematic even if preliminary ?
72 73
John
N3AAZ
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Re: DSB transceiver for Digital mode
Jim,
I would leave it for customers’ modification. We have added a crystal in the front end as the filter. We will have to switch both.
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What about having both crystals and then adding a switch to go between the FT8 and JS8 frequencies?
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Adam,
Sounds good !
Will you release the schematic even if preliminary ?
72 73
John
N3AAZ
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Re: DSB transceiver for Digital mode
What about having both crystals and then adding a switch to go between the FT8 and JS8 frequencies?
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Re: DSB transceiver for Digital mode
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.
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Would it be possible to make this rig operate on the JS8CALL frequency of 7.078 instead??
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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.
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Adam,
My RockMite mod for FT8 DSB (NOVOX (yet hi hi))
John
N3AAZ
<20190421_113518.jpg>
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ps ...
Q2 has no FT8 function (yet)
John N3AAZ
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Adam,
My RockMite mod for FT8 DSB (NOVOX (yet hi hi))
John
N3AAZ
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Re: DSB transceiver for Digital mode
Would it be possible to make this rig operate on the JS8CALL frequency of 7.078 instead??
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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.
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?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>
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?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
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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
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Re: DSB transceiver for Digital mode
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. 在 2019年4月10日，上午8:03，Adam Rong via Groups.Io < rongxh@...> 写道：
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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
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Adam,
?Love your FT8 DSB VOX concept
Can't wait for a kit
72 73
John
N3AAZ
FM19
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Re: EOL: CRK-10A CW Transceiver Kit
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
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).
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Re: EOL: CRK-10A CW Transceiver Kit
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
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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).
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Jim
