Date   
Re: New Record: D4D QSO Distance

Adam Rong
 

Announcement:

I already sent a 40m D4D kit to BG7IKK as the Q3 contest 1st place award.

Thanks,
Adam

Re: New Record: D4D QSO Distance

Adam Rong
 

Guys,

The contest is still on. If you have better results than 13499km, please submit before September 30. The award is a D4D kit and you can define the band.

Thanks,
Adam

My comments regarding QRPGuys DSB Digital Transceiver

Adam Rong
 

Guys,

I sent a post here. I appreciate the support of my original concept and wish good luck to QRPGuys on the commercial aspect.

Thanks,
Adam

Re: Rewind your Mini Wire Antenna

Adam Rong
 

Bret,

I mean the former. Actually there is a thicker sized toroid and you can purchase from mouser.

Thanks,
Adam

在 2019年9月17日,上午6:23,Charles Jessee <cbjesseeNH@...> 写道:

Hi Adam - do you mean stack two FT-82-43 on top of one another to make a thicker “O” and winding around both? Or winding each individually and putting them in parallel?

Bret/N4SRN

Re: Rewind your Mini Wire Antenna

Charles Jessee
 

Hi Adam - do you mean stack two FT-82-43 on top of one another to make a thicker “O” and winding around both? Or winding each individually and putting them in parallel?

Bret/N4SRN

Re: D4D receive light only activates during transmit

Steve Goyette
 

Yes, turns out that was exactly what it was.  Thank you!

Steve

Re: Holiday project

Adam Rong
 

Guys,

As a post holiday project, I made a universal VXO.
image1.jpeg

Thanks,
Adam

在 2019年9月16日,上午8:24,Adam Rong via Groups.Io <rongxh@...> 写道:

Guys,

I made another simple project, a regenerative receiver to cover 7-16 MHz. The specialty of this circuit is that a readily available shielded coil is used. The original is FCZ series, while my replacement is DIY7-14. It worked great. In the following article, I explained that I have changed the power supply to 4x AA sized Ni-MH batteries to make about 5V, so I can save a regulator 78L05, and 5V can power LM386 too. Also, I used varicap diodes instead of varicaps.


Thanks,
Adam

在 2019年9月14日,上午9:03,Adam Rong via Groups.Io <rongxh@...> 写道:

Guys,

It is a traditional holiday Mid Autumn Festival, or Moon Cake Festival. I made a small project based on the book of JF1RNR, whom I met in person in Japan Ham Fair.

This morning I tested the half watt transceiver in Century Park and successfully logged a QSO with BG5JNT.
<image1.jpeg>

Thanks,
Adam

Re: Holiday project

Adam Rong
 

Guys,

I made another simple project, a regenerative receiver to cover 7-16 MHz. The specialty of this circuit is that a readily available shielded coil is used. The original is FCZ series, while my replacement is DIY7-14. It worked great. In the following article, I explained that I have changed the power supply to 4x AA sized Ni-MH batteries to make about 5V, so I can save a regulator 78L05, and 5V can power LM386 too. Also, I used varicap diodes instead of varicaps.


Thanks,
Adam

在 2019年9月14日,上午9:03,Adam Rong via Groups.Io <rongxh@...> 写道:

Guys,

It is a traditional holiday Mid Autumn Festival, or Moon Cake Festival. I made a small project based on the book of JF1RNR, whom I met in person in Japan Ham Fair.

This morning I tested the half watt transceiver in Century Park and successfully logged a QSO with BG5JNT.
<image1.jpeg>

Thanks,
Adam

Re: D4D receive light only activates during transmit

Adam Rong
 

Steve,

A local ham also encountered a similar problem. It does light on when the radio is powered on, although the LED is reversed. The explanation could be something like RF signal coupling.

Thanks,
Adam

在 2019年9月10日,下午7:30,Steve Goyette <steve@...> 写道:

Well that doesn’t explain the green light coming on during transmit.


On Sep 9, 2019, at 10:56 PM, Adam Rong <rongxh@...> wrote:

Steve,

Apparently your green LED is polarity reversed.

Thanks,
Adam

在 2019年9月10日,上午11:52,qrpjl1kra <mx6s@...> 写道:

Steve, 

I saw your good soldering at a  glance. 
But usually this view deceived us. Check everything again.

>but once transmit is complete both lights go out.

Strange. I recommend check out voltages during this status. Then you will find out reason.
Relay or something around ?

Finding reason is part of hobby and fun !
Generally kit need effort to complete is worth more than soon completed.
You paid same price and you can play longer than the others.
Otherwise there are many completed product is the world.

Juncihi JL1KRA
 





----- Original Message -----
From: Steve Goyette <steve@...>
To: crkits@groups.io 
Date: 2019/9/10, Tue 12:04
Subject: Re: [crkits] D4D receive light only activates during transmit

Anyone have any ideas? Thinking I need to start by testing the transistors and work out from there.


On Sep 7, 2019, at 8:35 AM, steve via Groups.Io <steve@...> wrote:

Hi Adam,

Here you go:
<IMG_0898.jpeg><IMG_0897.jpeg><IMG_0896.jpeg><IMG_0895.jpeg>



Holiday project

Adam Rong
 

Guys,

It is a traditional holiday Mid Autumn Festival, or Moon Cake Festival. I made a small project based on the book of JF1RNR, whom I met in person in Japan Ham Fair.

This morning I tested the half watt transceiver in Century Park and successfully logged a QSO with BG5JNT.
image1.jpeg

Thanks,
Adam

Rewind your Mini Wire Antenna

Adam Rong
 

Folks,

There is a thread in an EFHW antenna Facebook group talking about our Mini Wire Antenna. K1RF Steve pointed out one thing that 2T:14T might not be good for a small size toroid, and it is recommended to wind 3T:21T to add inductance to help the lower band like 40m.

I agree with his point and it is recommended that you follow by rewinding your toroid. Also, if you have FT-82-43 in hand, you can consider upgrade by winding on two of them, same 3T:21T, to add power.

Sorry for the trouble caused, although in many of my test SWR for 2T:14T is under 1.5. I believe K1RF’s recommendation is helpful.

Thanks,
Adam

Re: D4D receive light only activates during transmit

Steve Goyette
 

Well that doesn’t explain the green light coming on during transmit.


On Sep 9, 2019, at 10:56 PM, Adam Rong <rongxh@...> wrote:

Steve,

Apparently your green LED is polarity reversed.

Thanks,
Adam

在 2019年9月10日,上午11:52,qrpjl1kra <mx6s@...> 写道:

Steve, 

I saw your good soldering at a  glance. 
But usually this view deceived us. Check everything again.

>but once transmit is complete both lights go out.

Strange. I recommend check out voltages during this status. Then you will find out reason.
Relay or something around ?

Finding reason is part of hobby and fun !
Generally kit need effort to complete is worth more than soon completed.
You paid same price and you can play longer than the others.
Otherwise there are many completed product is the world.

Juncihi JL1KRA
 





----- Original Message -----
From: Steve Goyette <steve@...>
To: crkits@groups.io
Date: 2019/9/10, Tue 12:04
Subject: Re: [crkits] D4D receive light only activates during transmit

Anyone have any ideas? Thinking I need to start by testing the transistors and work out from there.


On Sep 7, 2019, at 8:35 AM, steve via Groups.Io <steve@...> wrote:

Hi Adam,

Here you go:
<IMG_0898.jpeg><IMG_0897.jpeg><IMG_0896.jpeg><IMG_0895.jpeg>


Re: D4D receive light only activates during transmit

Adam Rong
 

Steve,

Apparently your green LED is polarity reversed.

Thanks,
Adam

在 2019年9月10日,上午11:52,qrpjl1kra <mx6s@...> 写道:

Steve, 

I saw your good soldering at a  glance. 
But usually this view deceived us. Check everything again.

>but once transmit is complete both lights go out.

Strange. I recommend check out voltages during this status. Then you will find out reason.
Relay or something around ?

Finding reason is part of hobby and fun !
Generally kit need effort to complete is worth more than soon completed.
You paid same price and you can play longer than the others.
Otherwise there are many completed product is the world.

Juncihi JL1KRA
 





----- Original Message -----
From: Steve Goyette <steve@...>
To: crkits@groups.io
Date: 2019/9/10, Tue 12:04
Subject: Re: [crkits] D4D receive light only activates during transmit

Anyone have any ideas? Thinking I need to start by testing the transistors and work out from there.


On Sep 7, 2019, at 8:35 AM, steve via Groups.Io <steve@...> wrote:

Hi Adam,

Here you go:
<IMG_0898.jpeg><IMG_0897.jpeg><IMG_0896.jpeg><IMG_0895.jpeg>


Re: D4D receive light only activates during transmit

qrpjl1kra
 

Steve, 

I saw your good soldering at a  glance. 
But usually this view deceived us. Check everything again.

>but once transmit is complete both lights go out.

Strange. I recommend check out voltages during this status. Then you will find out reason.
Relay or something around ?

Finding reason is part of hobby and fun !
Generally kit need effort to complete is worth more than soon completed.
You paid same price and you can play longer than the others.
Otherwise there are many completed product is the world.

Juncihi JL1KRA
 





----- Original Message -----
From: Steve Goyette <steve@...>
To: crkits@groups.io
Date: 2019/9/10, Tue 12:04
Subject: Re: [crkits] D4D receive light only activates during transmit

Anyone have any ideas? Thinking I need to start by testing the transistors and work out from there.


On Sep 7, 2019, at 8:35 AM, steve via Groups.Io <steve@...> wrote:

Hi Adam,

Here you go:
<IMG_0898.jpeg><IMG_0897.jpeg><IMG_0896.jpeg><IMG_0895.jpeg>


Re: D4D receive light only activates during transmit

Steve Goyette
 

Anyone have any ideas? Thinking I need to start by testing the transistors and work out from there.


On Sep 7, 2019, at 8:35 AM, steve via Groups.Io <steve@...> wrote:

Hi Adam,

Here you go:
<IMG_0898.jpeg><IMG_0897.jpeg><IMG_0896.jpeg><IMG_0895.jpeg>

Re: D4D receive light only activates during transmit

Steve Goyette
 

Hi Adam,

Here you go:

Re: D4D receive light only activates during transmit

Adam Rong
 

Steve,

Please show me close look pictures of both sides.

Thanks,
Adam

D4D receive light only activates during transmit

Steve Goyette
 

Hi,

I've built the 20m version of the D4D kit and when I connect it both lights come on then both lights go off after 1 second.  Plugging into a computer I get received signals that are properly decoded and the green light WILL come on along with the amber light when transmitting (VOX activated) but once transmit is complete both lights go out.

Any ideas what I should check?

Thanks,

Steve

Re: Operation under emergency conditions

Dr. Pedro E. Colla (LU7DID)
 

Thank you!

Re: Operation under emergency conditions

Adam Rong
 

Hi LU7DID,

If you really need to work at 5V, it is recommended to replace 78L05 by a LDO type 5V regulator.

For the TX amplifier, the output can be as low as 100-200mW if you power with 5V. You can test it.

Thanks,
Adam

在 2019年9月4日,下午8:04,Dr. Pedro E. Colla (LU7DID) <lu7did@...> 写道:

Adam,
 
In a bare bones emergency situation to which extend the D4D works with a high capacity 5V pack as it's sole power supply? (assume connectors worked out properly).
 
¿Does the D4D work with less performance/power? ¿Works very degraded? ¿Doesn't work at all?
 
Thanks for your answer. 
 
73 de Pedro, LU7DID