Date   
Re: 14.070.0 not pulling to 14.074.0 for the 20 meter DSB

John
 

Well I don't understand. They sell lots these kits. Not sure how many are for 20 meters as the 20 meter kits are the only ones that pull the crystal frequency. I think I will contact the owner of crkits and see what he has to say. Thank you very much for your time.

John K2JHU...

On Mon, Nov 11, 2019 at 3:26 PM Steven Weber <steve.kd1jv@...> wrote:

Then your out of luck. You can probably pull the oscillator crystal up 4 kHz with a series trimmer, or at least get it in the ball park. That’s about the limit you can go and retain stability.

 

But you’ll be way off center pass of the crystal in the receiver leg and there’s no good way to change that. The receiver will be exceptionally deaf. A L/C tuned circuit could be substituted for the crystal.

 

KD1JV  

 

 

Both crystals say 14.070

 

K2jhu

 

On Mon, Nov 11, 2019 at 1:57 PM Steven Weber <steve.kd1jv@...> wrote:

What frequency is the crystal cut for?

KD1JV

 

 

OK I understand what you are saying. The problem I am having is for the 20 meter D4D kit from crkits.

There are 2 caps, one from pin 7 of the NE602 to ground and one going between pins 6 and 7 and one side of the crystal with the other side of the crystal being grounded. The signal I have is strong but not on 14.074.00

 

John K2JHU...

 

On Mon, Nov 11, 2019 at 1:36 PM Steven Weber <steve.kd1jv@...> wrote:

Capacitive loading lowers the crystal frequency, which are typically the two caps on the SA602/612 pins 6 and 7.  But if you have a 14.070 crystal but really want to be on 14.074, you need to put a capacitor in series with the  crystal to rise it’s frequency. This is best done with a trimmer cap, a 30pfd trimmer cap would likely do the trick.

 

Steve KD1JV

 

Hi all. Hoping someone can advise me what causes the pulling of the 14.070.0 crystal to 14.074.0 In step 3 of the manual it states by adding a wire to the antenna termanual of your transceiver and placing the DSB board near the wire you can zero beat to confirm the frequency. The zero beat approach works fine except my unit in on 14.070.0 the crystal frequency, not the pulled 14.074.0. I don't know what actually pulls the frequency so if anyone can help me with this I truly would appreciate it. Thanks for your time.

 

John K2JHU...

 

 

 

Re: 14.070.0 not pulling to 14.074.0 for the 20 meter DSB

Steven Weber
 

Then your out of luck. You can probably pull the oscillator crystal up 4 kHz with a series trimmer, or at least get it in the ball park. That’s about the limit you can go and retain stability.

 

But you’ll be way off center pass of the crystal in the receiver leg and there’s no good way to change that. The receiver will be exceptionally deaf. A L/C tuned circuit could be substituted for the crystal.

 

KD1JV  

 

 

Both crystals say 14.070

 

K2jhu

 

On Mon, Nov 11, 2019 at 1:57 PM Steven Weber <steve.kd1jv@...> wrote:

What frequency is the crystal cut for?

KD1JV

 

 

OK I understand what you are saying. The problem I am having is for the 20 meter D4D kit from crkits.

There are 2 caps, one from pin 7 of the NE602 to ground and one going between pins 6 and 7 and one side of the crystal with the other side of the crystal being grounded. The signal I have is strong but not on 14.074.00

 

John K2JHU...

 

On Mon, Nov 11, 2019 at 1:36 PM Steven Weber <steve.kd1jv@...> wrote:

Capacitive loading lowers the crystal frequency, which are typically the two caps on the SA602/612 pins 6 and 7.  But if you have a 14.070 crystal but really want to be on 14.074, you need to put a capacitor in series with the  crystal to rise it’s frequency. This is best done with a trimmer cap, a 30pfd trimmer cap would likely do the trick.

 

Steve KD1JV

 

Hi all. Hoping someone can advise me what causes the pulling of the 14.070.0 crystal to 14.074.0 In step 3 of the manual it states by adding a wire to the antenna termanual of your transceiver and placing the DSB board near the wire you can zero beat to confirm the frequency. The zero beat approach works fine except my unit in on 14.070.0 the crystal frequency, not the pulled 14.074.0. I don't know what actually pulls the frequency so if anyone can help me with this I truly would appreciate it. Thanks for your time.

 

John K2JHU...

 

 

 

Re: 14.070.0 not pulling to 14.074.0 for the 20 meter DSB

John
 

Both crystals say 14.070

K2jhu

On Mon, Nov 11, 2019 at 1:57 PM Steven Weber <steve.kd1jv@...> wrote:

What frequency is the crystal cut for?

KD1JV

 

 

OK I understand what you are saying. The problem I am having is for the 20 meter D4D kit from crkits.

There are 2 caps, one from pin 7 of the NE602 to ground and one going between pins 6 and 7 and one side of the crystal with the other side of the crystal being grounded. The signal I have is strong but not on 14.074.00

 

John K2JHU...

 

On Mon, Nov 11, 2019 at 1:36 PM Steven Weber <steve.kd1jv@...> wrote:

Capacitive loading lowers the crystal frequency, which are typically the two caps on the SA602/612 pins 6 and 7.  But if you have a 14.070 crystal but really want to be on 14.074, you need to put a capacitor in series with the  crystal to rise it’s frequency. This is best done with a trimmer cap, a 30pfd trimmer cap would likely do the trick.

 

Steve KD1JV

 

Hi all. Hoping someone can advise me what causes the pulling of the 14.070.0 crystal to 14.074.0 In step 3 of the manual it states by adding a wire to the antenna termanual of your transceiver and placing the DSB board near the wire you can zero beat to confirm the frequency. The zero beat approach works fine except my unit in on 14.070.0 the crystal frequency, not the pulled 14.074.0. I don't know what actually pulls the frequency so if anyone can help me with this I truly would appreciate it. Thanks for your time.

 

John K2JHU...

 

 

Re: 14.070.0 not pulling to 14.074.0 for the 20 meter DSB

Steven Weber
 

What frequency is the crystal cut for?

KD1JV

 

 

OK I understand what you are saying. The problem I am having is for the 20 meter D4D kit from crkits.

There are 2 caps, one from pin 7 of the NE602 to ground and one going between pins 6 and 7 and one side of the crystal with the other side of the crystal being grounded. The signal I have is strong but not on 14.074.00

 

John K2JHU...

 

On Mon, Nov 11, 2019 at 1:36 PM Steven Weber <steve.kd1jv@...> wrote:

Capacitive loading lowers the crystal frequency, which are typically the two caps on the SA602/612 pins 6 and 7.  But if you have a 14.070 crystal but really want to be on 14.074, you need to put a capacitor in series with the  crystal to rise it’s frequency. This is best done with a trimmer cap, a 30pfd trimmer cap would likely do the trick.

 

Steve KD1JV

 

Hi all. Hoping someone can advise me what causes the pulling of the 14.070.0 crystal to 14.074.0 In step 3 of the manual it states by adding a wire to the antenna termanual of your transceiver and placing the DSB board near the wire you can zero beat to confirm the frequency. The zero beat approach works fine except my unit in on 14.070.0 the crystal frequency, not the pulled 14.074.0. I don't know what actually pulls the frequency so if anyone can help me with this I truly would appreciate it. Thanks for your time.

 

John K2JHU...

 

 

Re: 14.070.0 not pulling to 14.074.0 for the 20 meter DSB

John
 

OK I understand what you are saying. The problem I am having is for the 20 meter D4D kit from crkits.
There are 2 caps, one from pin 7 of the NE602 to ground and one going between pins 6 and 7 and one side of the crystal with the other side of the crystal being grounded. The signal I have is strong but not on 14.074.00

John K2JHU...

On Mon, Nov 11, 2019 at 1:36 PM Steven Weber <steve.kd1jv@...> wrote:

Capacitive loading lowers the crystal frequency, which are typically the two caps on the SA602/612 pins 6 and 7.  But if you have a 14.070 crystal but really want to be on 14.074, you need to put a capacitor in series with the  crystal to rise it’s frequency. This is best done with a trimmer cap, a 30pfd trimmer cap would likely do the trick.

 

Steve KD1JV

 

Hi all. Hoping someone can advise me what causes the pulling of the 14.070.0 crystal to 14.074.0 In step 3 of the manual it states by adding a wire to the antenna termanual of your transceiver and placing the DSB board near the wire you can zero beat to confirm the frequency. The zero beat approach works fine except my unit in on 14.070.0 the crystal frequency, not the pulled 14.074.0. I don't know what actually pulls the frequency so if anyone can help me with this I truly would appreciate it. Thanks for your time.

 

John K2JHU...

 

Re: 14.070.0 not pulling to 14.074.0 for the 20 meter DSB

Steven Weber
 

Capacitive loading lowers the crystal frequency, which are typically the two caps on the SA602/612 pins 6 and 7.  But if you have a 14.070 crystal but really want to be on 14.074, you need to put a capacitor in series with the  crystal to rise it’s frequency. This is best done with a trimmer cap, a 30pfd trimmer cap would likely do the trick.

 

Steve KD1JV

 

Hi all. Hoping someone can advise me what causes the pulling of the 14.070.0 crystal to 14.074.0 In step 3 of the manual it states by adding a wire to the antenna termanual of your transceiver and placing the DSB board near the wire you can zero beat to confirm the frequency. The zero beat approach works fine except my unit in on 14.070.0 the crystal frequency, not the pulled 14.074.0. I don't know what actually pulls the frequency so if anyone can help me with this I truly would appreciate it. Thanks for your time.

 

John K2JHU...

 

14.070.0 not pulling to 14.074.0 for the 20 meter DSB

John
 

Hi all. Hoping someone can advise me what causes the pulling of the 14.070.0 crystal to 14.074.0 In step 3 of the manual it states by adding a wire to the antenna termanual of your transceiver and placing the DSB board near the wire you can zero beat to confirm the frequency. The zero beat approach works fine except my unit in on 14.070.0 the crystal frequency, not the pulled 14.074.0. I don't know what actually pulls the frequency so if anyone can help me with this I truly would appreciate it. Thanks for your time.

John K2JHU...

Re: First FT8 Contact

John
 

Conor I've been using Dimension 4 to get the correct clock timing for a while now and it works great. I t
tried Minberg but was never satisfied with it. 

John K2JHU...

On Sun, Nov 10, 2019 at 11:48 AM Conor Farrell <conchobhair.ofearghail@...> wrote:
When you "go live" with your radio, remember that your computer time must be exact in order to both receive and transmit correctly. On my Windows laptop, I could never get the in-built NTP sync to work. So now I use a tool called NetTime from www.timesynctool.com and it works like a charm.

Conor

On Sun, 10 Nov 2019, 16:35 John, <johnk2jhu@...> wrote:
Kurt thanks for your reply. I just completed step 5 and getting ready to do the receive of signals test.
I won't forget the thermal pad for sure.Wish me luck.

John K2JHU...

On Sun, Nov 10, 2019 at 11:26 AM Kurt Loken <kurt.loken@...> wrote:
Hello John,

I must admit...that particular check, I skipped.  Bad practice, but I did.  Maybe someone one else on the group here can help you.  

One warning...don't do what I did at the end of the build...I forgot to put the thermal pad in between the end plate and Q4...I'm sure I did no favors to the rig as the relays went crazy and I got a bit of a zap from the power plug when I was plugging it in and pulling it out.  

Kurt (ae6uj)


On Sun, Nov 10, 2019 at 6:39 AM John <johnk2jhu@...> wrote:
Good morning Kurt. My name is John and my call is K2JHU.  Congratulations on your 1st contact. I am in the process of building my D4D DBS. I have completed up to stage 4, the RX audio amplifier. However this test did not go as expected. 
When I touch pin 1 of the NE602 I don't hear anything. It might be the impedance of the earphones I used are way off but not sure. Just wondering what you found at this stage.

On Sun, Nov 10, 2019 at 12:00 AM Kurt Loken <kurt.loken@...> wrote:
Hi there...

Had my first FT8 contact tonight using my just completed D4D DSB.  This was also the first two way contact using the magloop prototype you see in the pic.  Thanks for the kit!

73 de AE6UJ





Re: First FT8 Contact

Conor Farrell
 

When you "go live" with your radio, remember that your computer time must be exact in order to both receive and transmit correctly. On my Windows laptop, I could never get the in-built NTP sync to work. So now I use a tool called NetTime from www.timesynctool.com and it works like a charm.

Conor

On Sun, 10 Nov 2019, 16:35 John, <johnk2jhu@...> wrote:
Kurt thanks for your reply. I just completed step 5 and getting ready to do the receive of signals test.
I won't forget the thermal pad for sure.Wish me luck.

John K2JHU...

On Sun, Nov 10, 2019 at 11:26 AM Kurt Loken <kurt.loken@...> wrote:
Hello John,

I must admit...that particular check, I skipped.  Bad practice, but I did.  Maybe someone one else on the group here can help you.  

One warning...don't do what I did at the end of the build...I forgot to put the thermal pad in between the end plate and Q4...I'm sure I did no favors to the rig as the relays went crazy and I got a bit of a zap from the power plug when I was plugging it in and pulling it out.  

Kurt (ae6uj)


On Sun, Nov 10, 2019 at 6:39 AM John <johnk2jhu@...> wrote:
Good morning Kurt. My name is John and my call is K2JHU.  Congratulations on your 1st contact. I am in the process of building my D4D DBS. I have completed up to stage 4, the RX audio amplifier. However this test did not go as expected. 
When I touch pin 1 of the NE602 I don't hear anything. It might be the impedance of the earphones I used are way off but not sure. Just wondering what you found at this stage.

On Sun, Nov 10, 2019 at 12:00 AM Kurt Loken <kurt.loken@...> wrote:
Hi there...

Had my first FT8 contact tonight using my just completed D4D DSB.  This was also the first two way contact using the magloop prototype you see in the pic.  Thanks for the kit!

73 de AE6UJ





Re: First FT8 Contact

John
 

Kurt thanks for your reply. I just completed step 5 and getting ready to do the receive of signals test.
I won't forget the thermal pad for sure.Wish me luck.

John K2JHU...

On Sun, Nov 10, 2019 at 11:26 AM Kurt Loken <kurt.loken@...> wrote:
Hello John,

I must admit...that particular check, I skipped.  Bad practice, but I did.  Maybe someone one else on the group here can help you.  

One warning...don't do what I did at the end of the build...I forgot to put the thermal pad in between the end plate and Q4...I'm sure I did no favors to the rig as the relays went crazy and I got a bit of a zap from the power plug when I was plugging it in and pulling it out.  

Kurt (ae6uj)


On Sun, Nov 10, 2019 at 6:39 AM John <johnk2jhu@...> wrote:
Good morning Kurt. My name is John and my call is K2JHU.  Congratulations on your 1st contact. I am in the process of building my D4D DBS. I have completed up to stage 4, the RX audio amplifier. However this test did not go as expected. 
When I touch pin 1 of the NE602 I don't hear anything. It might be the impedance of the earphones I used are way off but not sure. Just wondering what you found at this stage.

On Sun, Nov 10, 2019 at 12:00 AM Kurt Loken <kurt.loken@...> wrote:
Hi there...

Had my first FT8 contact tonight using my just completed D4D DSB.  This was also the first two way contact using the magloop prototype you see in the pic.  Thanks for the kit!

73 de AE6UJ





Re: First FT8 Contact

Kurt Loken <kurt.loken@...>
 

Hello John,

I must admit...that particular check, I skipped.  Bad practice, but I did.  Maybe someone one else on the group here can help you.  

One warning...don't do what I did at the end of the build...I forgot to put the thermal pad in between the end plate and Q4...I'm sure I did no favors to the rig as the relays went crazy and I got a bit of a zap from the power plug when I was plugging it in and pulling it out.  

Kurt (ae6uj)


On Sun, Nov 10, 2019 at 6:39 AM John <johnk2jhu@...> wrote:
Good morning Kurt. My name is John and my call is K2JHU.  Congratulations on your 1st contact. I am in the process of building my D4D DBS. I have completed up to stage 4, the RX audio amplifier. However this test did not go as expected. 
When I touch pin 1 of the NE602 I don't hear anything. It might be the impedance of the earphones I used are way off but not sure. Just wondering what you found at this stage.

On Sun, Nov 10, 2019 at 12:00 AM Kurt Loken <kurt.loken@...> wrote:
Hi there...

Had my first FT8 contact tonight using my just completed D4D DSB.  This was also the first two way contact using the magloop prototype you see in the pic.  Thanks for the kit!

73 de AE6UJ





Re: First FT8 Contact

John
 

Good morning Kurt. My name is John and my call is K2JHU.  Congratulations on your 1st contact. I am in the process of building my D4D DBS. I have completed up to stage 4, the RX audio amplifier. However this test did not go as expected. 
When I touch pin 1 of the NE602 I don't hear anything. It might be the impedance of the earphones I used are way off but not sure. Just wondering what you found at this stage.

On Sun, Nov 10, 2019 at 12:00 AM Kurt Loken <kurt.loken@...> wrote:
Hi there...

Had my first FT8 contact tonight using my just completed D4D DSB.  This was also the first two way contact using the magloop prototype you see in the pic.  Thanks for the kit!

73 de AE6UJ





Re: First FT8 Contact

David Wilcox
 

I just got my QRPGuys DSB FT8 xcvr working and made my first contacts yesterday with a dipole.  Will try my AlexLoop soon.

David J. Wilcox K8WPE’s iPad

On Nov 10, 2019, at 2:37 AM, Adam Rong <rongxh@...> wrote:

Congratulations. I have never tried mag loop with D4D.

73 de BD6CR

Re: First FT8 Contact

Adam Rong
 

Congratulations. I have never tried mag loop with D4D.

73 de BD6CR

Re: K7QO closed his qrp-tech group

Hans Summers
 

Hi Don

qrp-tech was already on groups.io so the YahooGroups changes were not a factor.

73 Hans G0UPL 

On Sun, Nov 10, 2019, 02:44 Donald Sanders <w4bws1@...> wrote:
Yahoo is discontinuing the groups. They will only be a e-mail list with no files, pictures, etc.
Most groups are moving to .io with a new group. It costs $200 now to move. 
So some groups are just closing down. That may have been a factor.  
Dr. Don W4BWS

God Bless All

Ham Radio does not make the world go round.
Ham Radio is what makes the ride worthwhile.


On Sat, Nov 9, 2019 at 3:16 AM Adam Rong <rongxh@...> wrote:
Folks,

K7QO closed his qrp-tech group a few days ago. I am sorry to know that. Is QRP Tech obsolete?

Thanks,
Adam

First FT8 Contact

Kurt Loken <kurt.loken@...>
 

Hi there...

Had my first FT8 contact tonight using my just completed D4D DSB. This was also the first two way contact using the magloop prototype you see in the pic. Thanks for the kit!

73 de AE6UJ

Re: K7QO closed his qrp-tech group

Donald Sanders
 

Yahoo is discontinuing the groups. They will only be a e-mail list with no files, pictures, etc.
Most groups are moving to .io with a new group. It costs $200 now to move. 
So some groups are just closing down. That may have been a factor.  
Dr. Don W4BWS

God Bless All

Ham Radio does not make the world go round.
Ham Radio is what makes the ride worthwhile.


On Sat, Nov 9, 2019 at 3:16 AM Adam Rong <rongxh@...> wrote:
Folks,

K7QO closed his qrp-tech group a few days ago. I am sorry to know that. Is QRP Tech obsolete?

Thanks,
Adam

Re: K7QO closed his qrp-tech group

Hans Summers
 

Hello Adam

I don't care about legal aspects and never discussed them. In any case, rules vary from one country to another. So it can become a huge discussion. US is only one country among many, though for sure, a large and important ham population. 

I'm sure you know, my view on DSB in Digital modes is, I am not a fan of it. In my opinion it's neither necessary, not desriable, nor valuable. It's only my opinion, others have a different view, which is fine and normal. 

But still, the discussion on qrp-tech was, I thought, civilized... not about any particular product (yours or QRP Guys' product) just about technical advantages and disadvantages. So I don't see why it would have upset anyone or made anyone want to close the group. Surely the group was intended for technical discussions. 

73 Hans G0UPL 


On Sat, Nov 9, 2019, 11:55 Adam Rong <rongxh@...> wrote:
Thanks Hans. I joined K7QO’s qrp-tech because it was a pure tech forum with good management. I like the NC40A PCB design and the effort to celebrate the 25th anniversary.

I am not sure if it is related with the argument of DSB Digital Transceiver. I’d like to share my idea here.

D4D is my original idea. I treat it as a design of simple kit for fun. As I wrote in the last Q&A in the FAQ part of the 30-page D4D manual, this is something new and it will cause quite a discussion to settle down if it is a legal mode, but I think for a new mode, you always need some time to experiment and understand it. Design is sort of balance and I designed it only around 1-watt trying to find the balance. Also I would like to mention the LSB spectrum is for PSK31 and the SNR to decode is much higher than FT8, so largely it is not causing problems unless the DSB radio is nearby.

Thanks,
Adam

在 2019年11月9日,下午4:40,Hans Summers <hans.summers@...> 写道:


Hi Adam

There is a new replacement group called "qrptech" see https://groups.io/g/qrptech

73 Hans G0UPL 

On Sat, Nov 9, 2019, 11:16 Adam Rong <rongxh@...> wrote:
Folks,

K7QO closed his qrp-tech group a few days ago. I am sorry to know that. Is QRP Tech obsolete?

Thanks,
Adam

Re: K7QO closed his qrp-tech group

Hans Summers
 

QHello Adam

I don't care about legal aspects and never discussed them. In any case, rules vary from one country to another. So it can become a huge discussion. US is only one country among many, though for sure, a large and important ham population. 

I'm sure you know, my view on DSB in Digital modes is, I am not a fan of it. But still, the discussion on qrp-tech was 


On Sat, Nov 9, 2019, 11:55 Adam Rong <rongxh@...> wrote:
Thanks Hans. I joined K7QO’s qrp-tech because it was a pure tech forum with good management. I like the NC40A PCB design and the effort to celebrate the 25th anniversary.

I am not sure if it is related with the argument of DSB Digital Transceiver. I’d like to share my idea here.

D4D is my original idea. I treat it as a design of simple kit for fun. As I wrote in the last Q&A in the FAQ part of the 30-page D4D manual, this is something new and it will cause quite a discussion to settle down if it is a legal mode, but I think for a new mode, you always need some time to experiment and understand it. Design is sort of balance and I designed it only around 1-watt trying to find the balance. Also I would like to mention the LSB spectrum is for PSK31 and the SNR to decode is much higher than FT8, so largely it is not causing problems unless the DSB radio is nearby.

Thanks,
Adam

在 2019年11月9日,下午4:40,Hans Summers <hans.summers@...> 写道:


Hi Adam

There is a new replacement group called "qrptech" see https://groups.io/g/qrptech

73 Hans G0UPL 

On Sat, Nov 9, 2019, 11:16 Adam Rong <rongxh@...> wrote:
Folks,

K7QO closed his qrp-tech group a few days ago. I am sorry to know that. Is QRP Tech obsolete?

Thanks,
Adam

Re: K7QO closed his qrp-tech group

Adam Rong
 

Thanks Hans. I joined K7QO’s qrp-tech because it was a pure tech forum with good management. I like the NC40A PCB design and the effort to celebrate the 25th anniversary.

I am not sure if it is related with the argument of DSB Digital Transceiver. I’d like to share my idea here.

D4D is my original idea. I treat it as a design of simple kit for fun. As I wrote in the last Q&A in the FAQ part of the 30-page D4D manual, this is something new and it will cause quite a discussion to settle down if it is a legal mode, but I think for a new mode, you always need some time to experiment and understand it. Design is sort of balance and I designed it only around 1-watt trying to find the balance. Also I would like to mention the LSB spectrum is for PSK31 and the SNR to decode is much higher than FT8, so largely it is not causing problems unless the DSB radio is nearby.

Thanks,
Adam

在 2019年11月9日,下午4:40,Hans Summers <hans.summers@...> 写道:


Hi Adam

There is a new replacement group called "qrptech" see https://groups.io/g/qrptech

73 Hans G0UPL 

On Sat, Nov 9, 2019, 11:16 Adam Rong <rongxh@...> wrote:
Folks,

K7QO closed his qrp-tech group a few days ago. I am sorry to know that. Is QRP Tech obsolete?

Thanks,
Adam