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D4D: Ready to Take Order
开云体育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 |
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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 --
Thanks, Adam Rong |
开云体育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
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开云体育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
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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:
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Folks,
As I have promised, I created a button and you can order directly from my web site: 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 |
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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=[email protected]> wrote: How well will these work on Voice (with a proper Freq Xtal)? --
Thanks, Adam Rong |
Casey
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