Date   
Re: D4D for 6m band?

k5dez@...
 

I got the idea from a Youtuber....(TRXBench) and tried it on a cheap Xverter and it seems to work OK. Why not try soldering a PTC resistor to the crystal to help stabilize it? It would be a very cheap TCXO.....It would NOT be an industry standard of course but  it might work well enough. Just a thought.
Tim - K5DEZ

Re: D4D for 6m band?

Adam Rong
 

Tim,

Thanks, this is something that we can do. 

Thanks,
Adam

On Wed, May 22, 2019 at 7:17 AM <k5dez@q.com> wrote:
I got the idea from a Youtuber....(TRXBench) and tried it on a cheap Xverter and it seems to work OK. Why not try soldering a PTC resistor to the crystal to help stabilize it? It would be a very cheap TCXO.....It would NOT be an industry standard of course but  it might work well enough. Just a thought.
Tim - K5DEZ



--
Thanks,
Adam Rong

New file uploaded to crkits@groups.io

crkits@groups.io Notification <crkits+notification@...>
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the crkits@groups.io group.

File: D4D kit manual 0523.pdf

Uploaded By: Adam Rong

Description:
2nd preview version of D4D full manual. A lot of information and photos are added. This is very close to the formal release in a few days.

You can access this file at the URL:
https://groups.io/g/crkits/files/D4D%20Kit%20Documentations/D4D%20kit%20manual%200523.pdf

Cheers,
The Groups.io Team

Re: IMD performance of D4D

Jim
 
Edited

The D4D works great with my LDG Z-817 auto antenna tuner. 

73!

Jim - KH2SR

Re: IMD performance of D4D

Jim
 

Should jumper wires be installed in place of C20 & C23 after they are removed?

Re: IMD performance of D4D

Adam Rong
 

No. Otherwise it will short the coils.

Thanks,
Adam

在 2019年5月23日,上午4:57,Jim <KH2SR@...> 写道:

Should jumper wires be installed in place of C20 & C23 after they are removed?

Re: D4D for 6m band?

Adam Rong
 

Folks,

I did ask my crystal supplier about the possibility to customize an AT cut crystal for 50.313MHz. The answer is no, not even for an overtone type. It seems that a simple crystal controlled radio is not possible for 6m.

Thanks,
Adam

在 2019年5月22日,上午7:54,Adam Rong via Groups.Io <rongxh@...> 写道:

Tim,

Thanks, this is something that we can do. 

Thanks,
Adam

On Wed, May 22, 2019 at 7:17 AM <k5dez@q.com> wrote:
I got the idea from a Youtuber....(TRXBench) and tried it on a cheap Xverter and it seems to work OK. Why not try soldering a PTC resistor to the crystal to help stabilize it? It would be a very cheap TCXO.....It would NOT be an industry standard of course but  it might work well enough. Just a thought.
Tim - K5DEZ



--
Thanks,
Adam Rong

D4D: Test 30m JS8CALL

Adam Rong
 

Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam

Re: D4D: Test 30m JS8CALL

John M
 

Planning on it in 14 to 30 days. 
:-)

On Fri, May 24, 2019 at 12:24 PM Adam Rong <rongxh@...> wrote:
Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam


Re: D4D: Test 30m JS8CALL

Jim
 

Hi Adam. I am a avid JS8CALL user and I would be happy to test out 30m. I could then add it to the review I am doing for you. 

James Hannibal - KH2SR 

Re: D4D: Test 30m JS8CALL

Adam Rong
 

Folks,

Just completed the first 10.130MHz D4D with success. I will build one more tomorrow.

Thanks,
Adam

On Sat, May 25, 2019 at 2:03 AM Jim <KH2SR@...> wrote:
Hi Adam. I am a avid JS8CALL user and I would be happy to test out 30m. I could then add it to the review I am doing for you. 

James Hannibal - KH2SR 



--
Thanks,
Adam Rong

D4D: Modification for better IMD

Adam Rong
 

Folks,

Please refer to the photo to make modification to improve IMD. The RF output will be impacted but it is worthwhile to do so. Replace C5 by 103. Remove C6. Add a 1uF-10uF cap. Add a resistor of 22-27 ohm. Make connection as follows. Connect the positive pin of 1uF to the upper pad of C6. Connect the negative pin to the interconnection of 22-27 ohm and the original 330 ohm. Remember to adjust the audio output to just stably trigger the relay.



Thanks,
Adam

Re: D4D: Test 30m JS8CALL

Charlie Vest
 

I would be happy to do testing on 30 meters also when you are ready.

Charlie , W5COV

On May 24, 2019 at 12:57 PM John M <kf6efg@...> wrote:

Planning on it in 14 to 30 days. 
:-)

On Fri, May 24, 2019 at 12:24 PM Adam Rong < rongxh@...> wrote:
Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam



 

HF DF Receiver

GM4HYR
 

Hi Folks,

I’m looking for a simple DF receiver for out club “foxhunt” and noticed your
80m DF receiver.
Now, as we only operate on 160m, does anyone know if this unit can be modified?
I would be willing to try this given some advice.

73s. Melvyn. GM4HYR

Re: D4D: Test 30m JS8CALL

Adam Rong
 

Folks,

You can order 30m JS8CALL kit directly on my web site. Also, I have added Y audio adapter in case you just have one audio connector for headset on your PC. Please note MacBook Air won’t work.

http://crkits.com

Thanks,
Adam

在 2019年5月26日,上午4:32,Charlie Vest <cvest@...> 写道:

I would be happy to do testing on 30 meters also when you are ready.

Charlie , W5COV

On May 24, 2019 at 12:57 PM John M <kf6efg@...> wrote:

Planning on it in 14 to 30 days. 
:-)

On Fri, May 24, 2019 at 12:24 PM Adam Rong < rongxh@...> wrote:
Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam



 

Re: D4D: Test 30m JS8CALL

Doug Hendricks
 

Where do we get schematic?  If we are going to have to make mods, we need a schematic.  I have purchased a 20 and 40 meter version.


On Sat, May 25, 2019, 6:04 PM Adam Rong <rongxh@...> wrote:
Folks,

You can order 30m JS8CALL kit directly on my web site. Also, I have added Y audio adapter in case you just have one audio connector for headset on your PC. Please note MacBook Air won’t work.

http://crkits.com

Thanks,
Adam

在 2019年5月26日,上午4:32,Charlie Vest <cvest@...> 写道:

I would be happy to do testing on 30 meters also when you are ready.

Charlie , W5COV

On May 24, 2019 at 12:57 PM John M <kf6efg@...> wrote:

Planning on it in 14 to 30 days. 
:-)

On Fri, May 24, 2019 at 12:24 PM Adam Rong < rongxh@...> wrote:
Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam



 

Re: D4D: Test 30m JS8CALL

Adam Rong
 

Hi Doug,

Thanks for your support. The schematic of 40m is in the Photos directory. You can access through my web site. I will publish all schematics for 30 and 20m in Documentions directory soon.

Thanks,
Adam

在 2019年5月26日,上午9:19,Doug Hendricks <ki6ds1@...> 写道:

Where do we get schematic?  If we are going to have to make mods, we need a schematic.  I have purchased a 20 and 40 meter version.

On Sat, May 25, 2019, 6:04 PM Adam Rong <rongxh@...> wrote:
Folks,

You can order 30m JS8CALL kit directly on my web site. Also, I have added Y audio adapter in case you just have one audio connector for headset on your PC. Please note MacBook Air won’t work.

http://crkits.com

Thanks,
Adam

在 2019年5月26日,上午4:32,Charlie Vest <cvest@...> 写道:

I would be happy to do testing on 30 meters also when you are ready.

Charlie , W5COV

On May 24, 2019 at 12:57 PM John M <kf6efg@...> wrote:

Planning on it in 14 to 30 days. 
:-)

On Fri, May 24, 2019 at 12:24 PM Adam Rong < rongxh@...> wrote:
Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam



 

Re: D4D: Test 30m JS8CALL

Rod Wilkinson
 

Hi Adam, et all

Just to say I have just ordered 30m JS8CALL kit, should make an interesting project !
Looking forward to it arriving.
Many thanks Es 73

Rod G3TXA 


On 26 May 2019, at 03:59, Adam Rong <rongxh@...> wrote:

Hi Doug,

Thanks for your support. The schematic of 40m is in the Photos directory. You can access through my web site. I will publish all schematics for 30 and 20m in Documentions directory soon.

Thanks,
Adam

在 2019年5月26日,上午9:19,Doug Hendricks <ki6ds1@...> 写道:

Where do we get schematic?  If we are going to have to make mods, we need a schematic.  I have purchased a 20 and 40 meter version.

On Sat, May 25, 2019, 6:04 PM Adam Rong <rongxh@...> wrote:
Folks,

You can order 30m JS8CALL kit directly on my web site. Also, I have added Y audio adapter in case you just have one audio connector for headset on your PC. Please note MacBook Air won’t work.

http://crkits.com

Thanks,
Adam

在 2019年5月26日,上午4:32,Charlie Vest <cvest@...> 写道:

I would be happy to do testing on 30 meters also when you are ready.

Charlie , W5COV

On May 24, 2019 at 12:57 PM John M <kf6efg@...> wrote:

Planning on it in 14 to 30 days. 
:-)

On Fri, May 24, 2019 at 12:24 PM Adam Rong < rongxh@...> wrote:
Folks,

Anyone is interested in testing 10.130 version for JS8CALL? Beta testing is required as JS8CALL activity is low here.

Thanks,
Adam



 

D4D: Accessories Ideas

Adam Rong
 

Folks,

I put a photo regarding accessories here. Also it can be found in the Photos section under this album:
https://groups.io/g/crkits/album?id=90325

The Y audio adapter is useful when your computer has only one audio connector. Normally it is a combined 4-pin connector for microphone and headphone and it is the same as the connector on your cell phone. The Y adapter will split into two separated connectors for microphone and headphone, and can be connected to D4D using supplied audio cables. It is now orderable from http://crkits.com, in D4D Frequency and Option drop down list. The price is 5 USD. Note that this adapter won't work on MacBook Air. I haven't tested MacBook Pro, but Apple users, you can consider the following Creative SoundBlaster Play!3.

The Creative SoundBlaster Play!3 is a great companion to D4D. Although it is the low end in Creative external USB soundcard product line, it offers great SNR up to ~93dB and strong output to be able to drive 300 ohm big headphones. The big output range will offer flexibility to pursue big power or better IMD. The Creative SoundBlaster Play!3 can be ordered in most of the countries. I don't offer it. The price is around 25 USD. It can replace Y audio adapter.

I always wanted a light weight batter pack to give me more than 5 hours of operation. I soldered the DC plug to the 3x AA size battery holder with power switch, put in 3x 14500 sized (same as AA size) Li-Ion batteries of 1200mAh and it will give me 8 hours of operation. The power switch is very useful as D4D does not have one. The charging can be easy if you have a charger of 12.6V 1A. What you need is just an adapter cable. I haven't decided whether I should offer it but so far I like it because it is so handy. Even I offer it (battery holder, charger, adapter cable), you guys need to buy batteries in your country. I am not sure if it is possible.

Thanks,
Adam

Re: D4D: Test 30m JS8CALL

Adam Rong
 

Thanks Rod. I have the kits ready to ship tomorrow.

Thanks,
Adam