Topics

D4D: Ready to Take Order

Adam Rong
 

Folks,

I start to take email order now. The introductory price is 39 USD for kit including shipping to worldwide. As in the introductory period, you will get audio cable options for free. The earliest possible shipment date is now improved to May 13.

You can directly PayPal to rongxh@... and let me know 40m or 20m (80m not ready yet). I will ship based on the sequence of receiving your payment. I may delay shipment for one week or two due to workload.

This is the spec so far:

Summary: Crystal controlled single frequency DSB transceiver for 20m (14.074MHz), 40m (7.074MHz) or 80m (3.573MHz), other frequencies could be added per request
Power supply: 10-14V DC regulated power supply or battery pack, 12V is recommended, center positive, reverse polarity protection available
Current consumption in RX: about 15mA at 12V
Current consumption in TX: about 300mA at 12V
RF output: about 1W for 40m band at 12V, and a bit less for 20m band
Spurious suppression: no worse than -50dBc
Antenna connector: BNC connector, 50 ohm
Audio in connector: 3.5mm mono, at least 600mV to activate VOX, connects to headphone connector at PC sound card, no dedicated PTT connector is required
Audio out connector: 3.5mm mono, connects to microphone connector at PC sound card
Amber LED: TX status
Green LED: RX status
Frequency accuracy: -600 Hz ~ + 200 Hz
Frequency stability: Okay for FT8 mode per test. If the optional heater resistor R20* is added, after warm up, long term frequency stability in 10 min will be improved at the cost of acceptable short term frequency stability sacrifice in 30 sec.

Thanks,
Adam

maximilien971
 

Hello Adam
Very interesting!

Sorry if you still talk about it,  is there the case I have seen in the pics section?

73
Patrick
F6GWE

Adam Rong
 

Patrick,

The beautiful black metal case is included in the price!

Thanks,
Adam

在 2019年5月9日,上午12:06,maximilien971 <decastejac@...> 写道:

Hello Adam
Very interesting!

Sorry if you still talk about it,  is there the case I have seen in the pics section?

73
Patrick
F6GWE

John M
 

Do you have a link to your paypal?

Adam Rong
 

I will create a button and put on my web site this weekend but I am still on travel. I have received 5 orders so far and please continue to use rongxh@... to PayPal.

Thanks,
Adam

On Thu, May 9, 2019 at 5:11 AM John M <kf6efg@...> wrote:
Do you have a link to your paypal?



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Thanks,
Adam Rong

Furtuna Mircea
 

Hello Adam.Which crystals (frequent) can be added?
I'm especially interested in 10mhz (30 meter band).Mircea-YO9IOF

Adam Rong
 

I have found crystals of 10.140 and 10.130. I’ll see if it is good to be pulled. If they cannot be pulled, 10.130 will be good for JS8CALL.

Thanks,
Adam

在 2019年5月10日,下午3:01,Furtuna Mircea via Groups.Io <mircea99fm@...> 写道:

Hello Adam.Which crystals (frequent) can be added?
I'm especially interested in 10mhz (30 meter band).Mircea-YO9IOF

Adam Rong
 

Good news: 10130 can be pulled to around 10135.5 and it is good enough to cover 30m FT8 band. I will run more tests to make sure it is stable.

Thanks,
Adam

在 2019年5月10日,下午11:34,Adam Rong via Groups.Io <rongxh@...> 写道:

I have found crystals of 10.140 and 10.130. I’ll see if it is good to be pulled. If they cannot be pulled, 10.130 will be good for JS8CALL.

Thanks,
Adam

在 2019年5月10日,下午3:01,Furtuna Mircea via Groups.Io <mircea99fm@...> 写道:

Hello Adam.Which crystals (frequent) can be added?
I'm especially interested in 10mhz (30 meter band).Mircea-YO9IOF

Furtuna Mircea
 

Hello.I'm waiting for you to complete the tests, and I'm sure to order.Best regards.

Mark KG5SPO
 

Can I buy a few of the blank PC cards from you, if so how much?

Mark Schiff


On Wed, May 8, 2019 at 10:24 AM Adam Rong <rongxh@...> wrote:
Folks,

I start to take email order now. The introductory price is 39 USD for kit including shipping to worldwide. As in the introductory period, you will get audio cable options for free. The earliest possible shipment date is now improved to May 13.

You can directly PayPal to rongxh@... and let me know 40m or 20m (80m not ready yet). I will ship based on the sequence of receiving your payment. I may delay shipment for one week or two due to workload.

This is the spec so far:

Summary: Crystal controlled single frequency DSB transceiver for 20m (14.074MHz), 40m (7.074MHz) or 80m (3.573MHz), other frequencies could be added per request
Power supply: 10-14V DC regulated power supply or battery pack, 12V is recommended, center positive, reverse polarity protection available
Current consumption in RX: about 15mA at 12V
Current consumption in TX: about 300mA at 12V
RF output: about 1W for 40m band at 12V, and a bit less for 20m band
Spurious suppression: no worse than -50dBc
Antenna connector: BNC connector, 50 ohm
Audio in connector: 3.5mm mono, at least 600mV to activate VOX, connects to headphone connector at PC sound card, no dedicated PTT connector is required
Audio out connector: 3.5mm mono, connects to microphone connector at PC sound card
Amber LED: TX status
Green LED: RX status
Frequency accuracy: -600 Hz ~ + 200 Hz
Frequency stability: Okay for FT8 mode per test. If the optional heater resistor R20* is added, after warm up, long term frequency stability in 10 min will be improved at the cost of acceptable short term frequency stability sacrifice in 30 sec.

Thanks,
Adam

Adam Rong
 

Folks,

As I have promised, I created a button and you can order directly from my web site:
http://crkits.com

Due to the unexpected stability issue, I have to postpone the first shipment date from May 13 to May 20. Thanks for your understanding, and I wish to give you the best first impression.

BTW, I cannot offer blank PCB right now since all the parts are matched with the PCB quantity. I might reconsider later when I make the next lot.

Thanks,
Adam

Casey
 

How well will these work on Voice (with a proper Freq Xtal)?

Adam Rong
 

Very well. I have played music when dummy load is connected and it is quite high quality. However, you will need to inject quite high level volume (>600mV Vp) to activate VOX and you will need an external active speaker to be able to make voice QSO. An extra PTT may be required to enable/disable the microphone.

Thanks,
Adam

On Tue, May 14, 2019 at 12:48 AM Casey via Groups.Io <kc9ih=yahoo.com@groups.io> wrote:
How well will these work on Voice (with a proper Freq Xtal)?



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Thanks,
Adam Rong