Date   
KN990 flagship transceiver from BA6BF

Adam Rong
 

Gang,

BA6BF did it again. You can read about his latest flagship radio design from:
https://forums.qrz.com/index.php?threads/a-new-transceiver-kn990-made-by-ba6bf.626316/

If you wish to buy one, you can search Ebay.

--
Thanks,
Adam Rong

Re: KN990 flagship transceiver from BA6BF

Rob <roomberg@...>
 

I bought a KN850 and it has serious problems I can not fix.
I figured one day I would find the right ham electrical engineer that would want to play with it... document it.. and fix it.

For now.... I use it ONLY as a receiver for kids demonstrations of the ham bands.... which is WHY I bought it in the first
place.... to have a compact short wave radio receiver that cost no more than $300 and if the kids trashed it then I would be less upset compared to letting them play with a $1,000 KENWOOD.
 

http://www.learnmorsecode.com/kn850/index.html

Rob KB3BYT

On 12/23/2018 01:31 AM, Adam Rong wrote:
Gang,

BA6BF did it again. You can read about his latest flagship radio design from:
https://forums.qrz.com/index.php?threads/a-new-transceiver-kn990-made-by-ba6bf.626316/

If you wish to buy one, you can search Ebay.

--
Thanks,
Adam Rong

Re: Video Upload: Build a Simple RX

qrpjl1kra
 

Adam, 

Great video, superior than a detailed paper instruction.
Any beginner can made by himself.
Dozen of builders are making this simple receiver in Japan.

Easier than the MRX-40, QST magazine introduced decades ago, 
the simple receiver give us again something we have been forgotten in QRP spirits.

Nakajima


----- Original Message -----
From: Adam Rong <rongxh@...>
To: crkits@groups.io
Date: 2018/12/22, Sat 23:39
Subject: [crkits] Video Upload: Build a Simple RX

See this video:

Schematic:


Thanks,
Adam


Re: KN990 flagship transceiver from BA6BF

Ken Talbott
 

Thanks Rob, you probably just save me $. Seller refused my offer of $300 for KN990 which what I deem it to be worth.

Ken ke4rg

Re: KN990 flagship transceiver from BA6BF

Adam Rong
 

Rob,

If your problem is a common problem, the designer might have some clues. 

Thanks,
Adam

在 2018年12月24日,上午1:23,Rob via Groups.Io <roomberg@...> 写道:

I bought a KN850 and it has serious problems I can not fix.
I figured one day I would find the right ham electrical engineer that would want to play with it... document it.. and fix it.

For now.... I use it ONLY as a receiver for kids demonstrations of the ham bands.... which is WHY I bought it in the first
place.... to have a compact short wave radio receiver that cost no more than $300 and if the kids trashed it then I would be less upset compared to letting them play with a $1,000 KENWOOD.
 

http://www.learnmorsecode.com/kn850/index.html

Rob KB3BYT

On 12/23/2018 01:31 AM, Adam Rong wrote:
Gang,

BA6BF did it again. You can read about his latest flagship radio design from:
https://forums.qrz.com/index.php?threads/a-new-transceiver-kn990-made-by-ba6bf.626316/

If you wish to buy one, you can search Ebay.

--
Thanks,
Adam Rong

Re: KN990 flagship transceiver from BA6BF

Adam Rong
 

Ken,

The domestic price is higher than 300 bucks. The eBay seller cannot have lower price than that.

Thanks,
Adam

在 2018年12月24日,下午10:43,Ken Talbott <ktalbott@...> 写道:

Thanks Rob, you probably just save me $. Seller refused my offer of $300 for KN990 which what I deem it to be worth.

Ken ke4rg

I visited Windcamp last weekend

Adam Rong
 

Gang,

Merry Christmas!

I visited Windcamp studio last weekend. The owner makes nice looking antennas and battery packs as well as accessories for FT817/818 and KX3. His studio is much bigger than mine. I like his newly bought JBL speakers. His main dealers are located in EU and NA. His business is going very well over the years.

Thanks,
Adam

Re: Video Upload: Build a Simple RX

Jim Burns
 

What value are the two caps at pins 6 & 7?
Jim WB4ILP


On 9:39AM, Sat, Dec 22, 2018 Adam Rong <rongxh@... wrote:
See this video:

Schematic:


Thanks,
Adam

Re: Video Upload: Build a Simple RX

Adam Rong
 

Jim,

It depends on the load capacitor of the crystal and the mode. The normal load cap is 20 pF, and if you want to receive SSB, you will need to pick two caps to oscillate on the exact marked frequency. If you receive CW, you will need to oscillate a bit off to give you right tone pitch. In my case, I used 39 and 68 to give 700 Hz lower than 7010 crystal with 20 pF load capacitor.

Thanks,
Adam

在 2018年12月25日,上午3:32,Jim Burns <outbackerwb4ilp@...> 写道:

What value are the two caps at pins 6 & 7?
Jim WB4ILP


On 9:39AM, Sat, Dec 22, 2018 Adam Rong <rongxh@... wrote:
See this video:

Schematic:


Thanks,
Adam

<simple_rx.jpeg>

Re: Video Upload: Build a Simple RX

Jim Burns
 

Thanks Adam and Merry Christmas !
Jim


On 8:37PM, Mon, Dec 24, 2018 Adam Rong <rongxh@... wrote:
Jim,

It depends on the load capacitor of the crystal and the mode. The normal load cap is 20 pF, and if you want to receive SSB, you will need to pick two caps to oscillate on the exact marked frequency. If you receive CW, you will need to oscillate a bit off to give you right tone pitch. In my case, I used 39 and 68 to give 700 Hz lower than 7010 crystal with 20 pF load capacitor.

Thanks,
Adam

在 2018年12月25日,上午3:32,Jim Burns <outbackerwb4ilp@...> 写道:

What value are the two caps at pins 6 & 7?
Jim WB4ILP


On 9:39AM, Sat, Dec 22, 2018 Adam Rong <rongxh@... wrote:
See this video:

Schematic:


Thanks,
Adam

<simple_rx.jpeg>

Poor man’s FT8 transceiver

Adam Rong
 

Gang,

I built this transceiver last weekend. It is a VOX controlled simple DSB transceiver for 14.074 MHz using crystal. It puts 500 mW and the QSO test with my TS-590S seems promising. See the photos. Just share with you guys. No plan for a kit.





Thanks,
Adam

Re: Poor man’s FT8 transceiver

John Landry
 

Very nicely done Adam! 👍🏼

There's nothing more satisfying than completing QSO's using a transceiver you built.  Especially so for one built from scratch.

73,

John
AA7US

Add VOX to CS radio to better support FT8

Adam Rong
 

Gang,

The VOX circuit is very simple one like this:

I changed 47k to 10k to shorten the hold time.

Here is how I modified my radio (actually it is a crystal controlled FT8 radio but you can do the same for your CS radio as long as you change the mode to Upper Sided Band).
image1.jpeg
image2.jpeg
image3.jpeg
Thanks,
Adam

Yet another FT8 DSB rig

Adam Rong
 

Gang,

I followed VK3YE micro 40 and added a VOX circuit and here is the result:


Thanks,
Adam

Re: Yet another FT8 DSB rig

Adam Rong
 

Folks,

I managed the first QSO with this 1-watt DSB FT8 rig on 20m with a ham about 1168 miles away. The short term frequency stability is still an area for improvement due to final stage heating the crystal.


Thanks,
Adam

在 2019年1月30日,上午1:09,Adam Rong via Groups.Io <rongxh=gmail.com@groups.io> 写道:

Gang,

I followed VK3YE micro 40 and added a VOX circuit and here is the result:


Thanks,
Adam



<image1.jpeg>

Simple FT8 DSB rig

Adam Rong
 

I built it on my perf board. I made the first QSO days ago with a ham 1168 miles away. It is a 20m DSB 1-watt transceiver with VOX.

HT-1A review by Tech Examiner

Adam Rong
 

FT8 HT

Adam Rong
 

Lots of fun building and operating this simple FT8 rig by manually switching RX/TX.

And here is the schematic.

Thanks,
Adam

HT-1A Story

Adam Rong
 

A dedicated page for simple receiver

Adam Rong
 

Folks,

JL1KRA made a dedicated page for the simple receiver I introduced earlier. The design is quite unique but the performance is acceptable regarding selectivity and sensitivity. You can give it a try and make it a club project if you wish.