Date   
Re: Shipping resumes Feb 10

Adam Rong
 

Thanks guys.

We were able to ship on Feb 10. Among all the shipments, I upgraded two shipments via FedEx.

Thanks,
Adam

在 2020年2月11日,上午11:01,W8NSI James <w8nsi@...> 写道:

I hope all is well where you are with this terrible problem of the corona virus.
--
73 de w8nsi jim

Re: Shipping resumes Feb 10

W8NSI James
 

I hope all is well where you are with this terrible problem of the corona virus.
--
73 de w8nsi jim

Re: Shipping resumes Feb 10

Adam Rong
 

Thanks Nigel. We are well. I worked from home in the last week.

Thanks,
Adam

在 2020年2月9日,下午3:41,Nigel Young <multilec@...> 写道:

Hope you are well Adam.

Nigel

On Sun., 9 Feb. 2020, 4:54 pm Adam Rong, <rongxh@...> wrote:
Folks,

What a Chinese new year holiday! We stayed at home for 2 weeks and now the shipping forwarder resumes shipping.

Thanks,
Adam



Re: Shipping resumes Feb 10

Nigel Young
 

Hope you are well Adam.

Nigel

On Sun., 9 Feb. 2020, 4:54 pm Adam Rong, <rongxh@...> wrote:
Folks,

What a Chinese new year holiday! We stayed at home for 2 weeks and now the shipping forwarder resumes shipping.

Thanks,
Adam

Shipping resumes Feb 10

Adam Rong
 

Folks,

What a Chinese new year holiday! We stayed at home for 2 weeks and now the shipping forwarder resumes shipping.

Thanks,
Adam

Re: D4D mods

Larry Lovell
 

From my experience, there are many mods that people are making.  Some better than others.  If you purchase the kit and assemble it with the Rev D assembly manual, things should work very well.  All parts are included in that kit.


On Wed, Jan 29, 2020 at 3:47 PM Lawrence Macionski via Groups.Io <am_fm_radio=yahoo.com@groups.io> wrote:
Does anyone know if or when the mods you speak of will be incorporated in the kit. We are planning on a proposed group kit building for our club, and some members have concern regarding tested and true versus experimental designs including actual cost per unit. Some members do not control their purse strings other members are not degree-d engineers. Obviously, there will be a number of entries into the "group build" debate and the selection of project will ultimately be the project  with the best salesman. 

Advise,

Larry W8LM



--
Larry Lovell
73's N7RGW
http://QRVTronics.com
Cell: 214-697-1729

Re: D4D mods

Lawrence Macionski
 

Does anyone know if or when the mods you speak of will be incorporated in the kit. We are planning on a proposed group kit building for our club, and some members have concern regarding tested and true versus experimental designs including actual cost per unit. Some members do not control their purse strings other members are not degree-d engineers. Obviously, there will be a number of entries into the "group build" debate and the selection of project will ultimately be the project  with the best salesman. 

Advise,

Larry W8LM

Re: D4D mods

Adam Rong
 

Well, you'd better observe the spectrum. In my case, if the capacitor is too big, there is a peak at 1/2 signal frequency.

73 de BD6CR
Adam

Re: D4D mods

Jim WB2LHP in MI
 

Sorry...Been away for a bit...Try anything you have between 50 and 100pf...It's not that critical but 82pf would be optimal...Your target output should be 1 watt or so...I'm sure it will do more but you don't want to become non-linear or create unwanted signals...Jim WB2LHP

Re: Mini FT8 Station

Larry Lovell
 

I use VNC Viewer between my PC (in the house) and my Raspberry Pi/rig in the radio room.


On Sat, Nov 30, 2019 at 12:11 PM Thomas Mize KJ4GK <threemanpro@...> wrote:
Thanks Jim, your reply did help.

I have already purchased the Sunfounder open box(it says something about a plastic corner being chipped). I am going to use your setup as a reference for this.

One thing I am eager to find out is if I can find out a way to remotely control the screen of this from another windows desktop. As this is what I am doing right now with a windows tablet with my regular station. The tablet is beside my radio and I use Google Remote Desktop to control the tablet just as if i was sitting in front of it.

It would be really new to be able to store this setup in my storage room closer to an antenna away from my regular one so that it can be ran like you will be doing with solar. I can use a photo switch relay combo to switch either to another battery bank that was charged during the day for night time use or to mains power. I'll have to wait and see.

Well anyway buddy, if you get a chance to make a video of this in operation, and maybe showing a few software shots and maybe some hints on how you got the software all setup would be great. At very least maybe just some footage of the software in action would be really cool.

If not that is fine I am very happy with the info you have already shared. Have fun buddy.

Thomas,

KJ4GK



--
Larry Lovell
73's N7RGW
http://QRVTronics.com
Cell: 214-697-1729

Re: 2020 new year announcement

Adam Rong
 

Folks,

During Chinese New Year from Jan 21 to Jan 30, I am not able to arrange shipment. If you wish to place big order for R3500D ARDF receivers, you will need to wait until early Feb.

Thanks,
Adam

Re: De KT4ET

William E. Artelt
 

The Transceiver information is all located at D4D Kit Documentations on the group.io Website Bruce 
Bill 
WB9YVM 

Sent from Bill


On Jan 10, 2020, at 8:47 PM, Bruce Palmer <kt4et.bruce@...> wrote:

I am in need of the schematic and parts list for the D4D . I can only find the 30 pages manual but without the part values it can not been built. Can anyone pass along how to find what needed?
Thanks and 73
Bruce
Deming, NM

Sent from KT4ETs Aerial Ranch and Museum
Deming, New Mexico


Re: De KT4ET

Min Zhu
 

De KT4ET

Bruce Palmer
 

I am in need of the schematic and parts list for the D4D . I can only find the 30 pages manual but without the part values it can not been built. Can anyone pass along how to find what needed?
Thanks and 73
Bruce
Deming, NM

Sent from KT4ETs Aerial Ranch and Museum
Deming, New Mexico

Re: 2020 new year announcement

rumeniv
 

Hi, Adam!

Happy New Year! And Happy 9th Anniversary of CRKits.com!

These are very good news! I was thinking to order D4D DSB Transceiver Kit and Mini Wire Antenna Kit for a some time and now with the drop of the prices I will do it! Also I am interested in getting  KN-Q7A or CS-series PCBs that you'll offer. I am interested in 20 and 40 m variants. I would like to ask you whether you may send these PCBs together with D4D Kit and Mini Wire Antenna Kit?

I think you are doing a great job for Radio Amateurs and your products are very interesting. When I first entered your web site I was surprised that some of the kits are sold out - especially KN-Q7A, CS-series and Choc Perf Boards. Now with your offer I would have the chance to build one of these kits.

I am a Bulgarian ham, but I live in Albania. I hope you can ship to Albania? I can pay through PayPal.

73 de Roumen, LZ4IR and ZA1IR


На нд, 5.01.2020 г. в 7:35 Adam Rong <rongxh@...> написа:

Folks,

Happy new year!

2020 is the 9th year of CRKits.COM and I am glad I am still active with this side business, although I travel 95% for my professional work.

In 2020, my US distributor Larry will close his web site and only support local customers via his facebook page. I have decided to revisit my pricing strategy and would cut about 10% for all my offerings. Please visit my web store to take a look.
http://crkits.com

As a gift to my customers, I would offer free main PCB of KN-Q7A or CS-series if you still remember. Please follow this thread if you need one or two piece. Please PayPal 5 USD for the postage. You can also request key parts to ship along if I still have them.

73 de BD6CR
Owner of CRKits.COM


Re: 2020 new year announcement

William E. Artelt
 

Hello Adam
Happy New Year!

Well all the Holiday gifts are hanging in the closet, I would like to order the 40 meter CrKit for FT8 operation.
Where do I specify that I would like it “assembled” I know you said there is an extra charge. I plan on using PayPal?

Thanks
Bill
WB9YVM
Fremont, California
Sent from Bill

On Jan 4, 2020, at 10:35 PM, Adam Rong <rongxh@...> wrote:

Folks,

Happy new year!

2020 is the 9th year of CRKits.COM and I am glad I am still active with this side business, although I travel 95% for my professional work.

In 2020, my US distributor Larry will close his web site and only support local customers via his facebook page. I have decided to revisit my pricing strategy and would cut about 10% for all my offerings. Please visit my web store to take a look.
http://crkits.com

As a gift to my customers, I would offer free main PCB of KN-Q7A or CS-series if you still remember. Please follow this thread if you need one or two piece. Please PayPal 5 USD for the postage. You can also request key parts to ship along if I still have them.

73 de BD6CR
Owner of CRKits.COM

2020 new year announcement

Adam Rong
 

Folks,

Happy new year!

2020 is the 9th year of CRKits.COM and I am glad I am still active with this side business, although I travel 95% for my professional work.

In 2020, my US distributor Larry will close his web site and only support local customers via his facebook page. I have decided to revisit my pricing strategy and would cut about 10% for all my offerings. Please visit my web store to take a look.
http://crkits.com

As a gift to my customers, I would offer free main PCB of KN-Q7A or CS-series if you still remember. Please follow this thread if you need one or two piece. Please PayPal 5 USD for the postage. You can also request key parts to ship along if I still have them.

73 de BD6CR
Owner of CRKits.COM

Re: Replacing BD139 with 2SC1969 or equivalent RF Transistor

Nigel Young
 

Hi Nick,

The biasing would need a little alteration but it should work fine as is. It also depends of course on what tcvr you are altering.
What will get the most gain is isolating the finals from their original supply voltage and increasing that from say 12v to 24v.
Since you are on this forum I expect you are using CRkit products. The spectral output is not great on these products, but they're built to a price point and simplicity.

If you really want to do a good job, dump the original finals and build a daughter board using your silicons.

It's really a chore of diminishing returns, those transistors are expensive compared to the BD139 and although you can push your output a little higher, 12w as I remember, there are cheaper easier options.

Try look for a design you can build outboard, maybe with a push pull circuit or doubled up finals.

Good luck, Nigel de ZL1NAY

On Mon., 30 Dec. 2019, 9:15 am Nicholas Triantafyllou, <nicholas.triantafyllou@...> wrote:
Hi

Has anyone experimented with replacing the BD139 output transistor with a 2SC1969 or other transistor to increase the power output? It seems technically possible...

Thanks

Nicholas 2E0GKG

Re: Replacing BD139 with 2SC1969 or equivalent RF Transistor

Steven Weber
 

You would need a lot more drive to get any significant power out of the 2SC1969, which means adding at least one more stage. It would be easier to drive the 2SC1969 with the existing BD139. All in all, not work the effort.

 

Steve KD1JV

 

Hi

Has anyone experimented with replacing the BD139 output transistor with a 2SC1969 or other transistor to increase the power output? It seems technically possible...

Thanks

Nicholas 2E0GKG

 

Replacing BD139 with 2SC1969 or equivalent RF Transistor

Nicholas Triantafyllou
 

Hi

Has anyone experimented with replacing the BD139 output transistor with a 2SC1969 or other transistor to increase the power output? It seems technically possible...

Thanks

Nicholas 2E0GKG