FT8 1500/3000

Charles Jessee

My CRKits D4D-20m is up and running! I’m using my G5RV antenna 150ft from my house and getting spots in NH (Northeast USA) all the way out to Texas and California - pretty good on what must be 10s of milliWatts emitted.

I see strong constant signals at exactly 1500 and 3000 on FT8 RX. What might those be and can I suppress them?

Thanks for an excellent kit! I’ll get that portable on my Raspberry Pi 4B soon.

Bret/N4SRN

Introduction to IC-705 by Japanese YL in English

#2876

Folks,

The young lady speaks fluent English and she does know about ham radio. The video is recorded by my iPhone in Japan Ham Fair. Enjoy!

Thanks,
Adam

Re: Just back from Japan Ham Fair

#2875

Hi Alex

I am one of Alexloop user in Japan from early stage through direct purchase from you.

For make sure of the first introduction of the Alexloop in Japan and

respect to effort to its introduction,

it was done in 2013 at the QRP Village booth by JA8CCL Mr. Kinoshita.

In spite of his main radio equipment business,

this year he devoted entirely explain the goodness of loop antenna technology.

I supported him and explained my real QSO experience.?

Later, other importers grabbed the item and they are handling as one of their various importing products.

Once I considered to buy another one but it was too expensive to buy. Hihi

Junichi JL1KRA

Show quoted text

----- Original Message -----
From: py1ahd <py1ahd@...>
To: [email protected]
Date: 2019/9/2, Mon 09:29
Subject: Re: [crkits] Just back from Japan Ham Fair

Hello Adam,

Japan Ham Fair is a unique experience.

Tokyo Ham Show 2015 was a land mark om my Ham Life.

1) "PY1AHD Coke Loop" exhibited at MLA 48 Hams Group.

https://www.youtube.com/watch?v=gaJlrN3cElo

2) The AlexLoop in demonstration for the first time on JACOM booth

3) The AlexLoop in exhibition beside the YAESU FT817 on YAESU booth.

https://www.youtube.com/watch?v=khzM-9Xt0MI

I follow with great interest your excelent work Adam.

73 to all

PY1AHD ALEX

Alexandre Grimberg

?

?

?

Em 01/09/2019 19:44, Adam Rong escreveu:

Folks,

The first time to join Japan Ham Fair. Really enjoyed it. I hope you can share my fun by reading these two posts.

--

Thanks,

Adam Rong

Re: Just back from Japan Ham Fair

#2874

Hello Adam,

Japan Ham Fair is a unique experience.

Tokyo Ham Show 2015 was a land mark om my Ham Life.

1) "PY1AHD Coke Loop" exhibited at MLA 48 Hams Group.

https://www.youtube.com/watch?v=gaJlrN3cElo

2) The AlexLoop in demonstration for the first time on JACOM booth

3) The AlexLoop in exhibition beside the YAESU FT817 on YAESU booth.

https://www.youtube.com/watch?v=khzM-9Xt0MI

I follow with great interest your excelent work Adam.

73 to all

PY1AHD ALEX

Alexandre Grimberg

?

Em 01/09/2019 19:44, Adam Rong escreveu:

Show quoted text

Folks,

The first time to join Japan Ham Fair. Really enjoyed it. I hope you can share my fun by reading these two posts.

--

Thanks,

Adam Rong

Just back from Japan Ham Fair

#2873

Folks,

The first time to join Japan Ham Fair. Really enjoyed it. I hope you can share my fun by reading these two posts.

--

Thanks,

Adam Rong

Re: D4D: Kit Assembly Manual Updated to Rev. C

#2872

开云体育

Lion,

Welcome to the group. Please visit to place order directly.

Thanks,

Adam

在 2019年9月1日，上午12:20，levko <ok2oll@...> 写道：

Show quoted text

This TRX on FT8 mod looks very good. I will be interested, but where to order and how much will it cost? Lion OK2PLL

Re: D4D: Kit Assembly Manual Updated to Rev. C

levko

#2871

This TRX on FT8 mod looks very good. I will be interested, but where to order and how much will it cost? Lion OK2PLL

Re: Input voltage for HT-1A?

#2870

If anyone is interested thinginverse has an adapter for the Ryobi 18 volt battery that fits the contacts giving you a nice power supply.
If anyone is wants the link to the thinginverse project.

Tom
K0amd

Show quoted text

On Aug 29, 2019, at 10:21 AM, K9DRP <donpine@...> wrote:

I just picked up several 4 cell holders for making a battery pack with
18650's, and a supply of used cells.  But fully charged cells make for
an initial voltage of 16.7 or so volts.

Do I dare connect my HT-1A to this much voltage?

73,

Don, K9DRP


-- 
"I reckon.  Therefore I am."
    Don Pine, K9DRP
   donpine@...
   donpine@...
     217-826-1111

Re: Input voltage for HT-1A?

willie b

#2869

manual states 14V max, happiest at 12V... that said, i run my Xiegu G1M QRP rig off four 18650s...i think you'll find you'll only have ~15V out from your pack... if you're worried, use a charger that indicates percentage, and only charge 'em up to give? you 13V out of your pack?

72,

bill, kg4zqz

Show quoted text

On Thu, Aug 29, 2019 at 11:21 AM K9DRP <donpine@...> wrote:

I just picked up several 4 cell holders for making a battery pack with
18650's, and a supply of used cells.? But fully charged cells make for
an initial voltage of 16.7 or so volts.

Do I dare connect my HT-1A to this much voltage?

73,

Don, K9DRP

--
"I reckon.? Therefore I am."
? ? ?Don Pine, K9DRP
? ? donpine@...
? ? donpine@...
? ? ? 217-826-1111

Input voltage for HT-1A?

#2868

I just picked up several 4 cell holders for making a battery pack with
18650's, and a supply of used cells.  But fully charged cells make for
an initial voltage of 16.7 or so volts.

Do I dare connect my HT-1A to this much voltage?

73,

Don, K9DRP


-- 
"I reckon.  Therefore I am."
     Don Pine, K9DRP
    donpine@...
    donpine@...
      217-826-1111

Re: Z-match Antenna Tuner on Choc perfboard

#2867

Folks,

I have a WeChat group for Chinese domestic hams. I just kitted a few Z-match tuner board kits for domestic hams at the parts price. It is fun to build together.

GQRP club has a great manual for it and we are following this:
http://www.gqrp.com/ATUmanual.pdf

Thanks,
Adam

Re: D4D low power output

#2866

250-260mA is normal for 20m.

Thanks,

Adam

Show quoted text

On Sat, Aug 24, 2019 at 3:01 AM Fernando S <fsclavo@...> wrote:

I tested my 20m kit and with power bar on max, it draws about 250~260 mA at 12v, are those value normal?

--

Thanks,

Adam Rong

Re: D4D low power output

Fernando S

#2865

I tested my 20m kit and with power bar on max, it draws about 250~260 mA at 12v, are those value normal?

Re: D4D TX power

#2864

The mods are good enough. Now you have the flexibility to pursue better IMD if you inject audio just above VOX trigger point, or higher RF output if you increase audio.

Thanks,

Adam

Show quoted text

On Fri, Aug 23, 2019 at 10:27 PM Fernando S <fsclavo@...> wrote:

Thanks for the fast response Adam!
I did KD1JV diode mod (the left one on your photo below), and replacing C5 by the provided 105 capacitor.
Is there any other recommended mod? With the mods I made, the power needs to be calibrated just as manual says? (I doesn't have a power meter).

El vie., 23 ago. 2019 a las 11:16, Adam Rong (<rongxh@...>) escribió:
Congratulations! 600mV is the threshold to trigger the VOX. However, about 50mV is the point to overdrive NE602 per KD1JV. That's why I recommend a modification to improve IMD. Rule of thumb for acceptable IMD: Decrease the audio input until you find the RF output becomes about half.

Thanks,
Adam

--

Thanks,

Adam Rong

Re: D4D TX power

Fernando S

#2863

Thanks for the fast response Adam!

I did KD1JV diode mod (the left one on your photo below), and replacing C5 by the provided 105 capacitor.

Is there any other recommended mod? With the mods I made, the power needs to be calibrated just as manual says? (I doesn't have a power meter).

Show quoted text

El vie., 23 ago. 2019 a las 11:16, Adam Rong (<rongxh@...>) escribió:

Congratulations! 600mV is the threshold to trigger the VOX. However, about 50mV is the point to overdrive NE602 per KD1JV. That's why I recommend a modification to improve IMD. Rule of thumb for acceptable IMD: Decrease the audio input until you find the RF output becomes about half.

Thanks,
Adam

Re: D4D TX power

#2862

Congratulations! 600mV is the threshold to trigger the VOX. However, about 50mV is the point to overdrive NE602 per KD1JV. That's why I recommend a modification to improve IMD. Rule of thumb for acceptable IMD: Decrease the audio input until you find the RF output becomes about half.

Thanks,
Adam

D4D TX power

Fernando S

#2861

Hi!

I finally assembled my kit in a couple of hours, and I'm very happy with it.

Related to TX power, I read on the manual that needs to be set just at the minimum level that triggers the relay stably, so how much power is not being?used before reaching an overdriving level? Is there any rule of thumb to raise the power a few db when minimum stably triggering level was found?

Thanks!

Re: HT-1A magic modification

#2860

Someone asked me what is the secret key. How many keys are on the front panel? Try and it won't hurt.

Thanks,
Adam

Re: HT-1A magic modification

#2859

Press and hold a secret key and power on. Check the splash screen for HT-1a instead of HT-1A and now you are good to transmit on 10MHz band before power off.

The spur and sensitivity of 10MHz is not the best, so use it at your own risk.

Thanks,
Adam

Re: HT-1A magic modification

#2858

Yes!

73,

Don, K9DRP