What frequency is the crystal cut for?

KD1JV

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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

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John K2JHU...

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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.

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Steve KD1JV

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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...

?

?

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...

?

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 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

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

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

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

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

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

Folks,

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

Thanks,
Adam

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?/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

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?/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

Folks,

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

Thanks,
Adam