Date   
Re: Tiny Toy Receiver

Adam Rong
 

Jim,

It is a direct conversion receiver but I changed LM386 to 2N3904. The X on a .01uf capacitor means it is totally removed. The tuned inductor is DIY7 series with built-in capacitor. I built 7.050 MHz version so I used DIY7-7. You can also use toroid coils of course. The major part of this design is the 2N3904 audio amplifier. It is biased by NE602 and it is driving a low impedance headphone. Also, it is very rare to switch power like that, but my result seems to be very positive.

Thanks,
Adam

在 2018年10月15日,上午2:15,Jim Pruitt <jpruitt67@...> 写道:

Hello Adam.

Some questions about your circuit.  First I see no information about the tuned inductor.  What did you use?  Second,  you have an X through a .01uf capacitor on the collector/output of the transistor.  Does that mean that collector goes directly to ground? Or does it mean the entire connection including ground is removed?  In looking at it, it looks a lot like most of the direct conversion receivers I have seen, with the exception of the transistor rather than an LM386 audio amp.  Chuck Adams did a group project of a direct conversion receiver and provided gerbers for buying your own pc boards on his email group (qrp-tech).  He used a toroid for that input coil.  Granted,  it also uses an LM386 audio amp so might not be as friendly to a 3.5 volt battery but works well on a 9 volt battery.

Thank you for the idea.

Jim Pruitt
WA7DUY


On 10/14/2018 7:49 AM, Adam Rong wrote:
Gang,

Here I show you my recent project.

Inspired by the receiver portion of VK3YE’s tiny toy CW transceiver (search YouTube videos to know more about this radio), I wanted to build a small receiver with minimal amount of parts but still give good result. Also, I tried to build the radio with a battery pack, so I can take it everywhere and plug in headphones and antenna, even without switching the power, i can immediately receive. And here is the result: a radio with only 12 parts including the battery pack. I powered it by one cell of Li-Po battery and the voltage (3.6-4.2V) is lower than the spec’ed lowest voltage of NE602 (4.5V) and it will give a bit lower conversion gain but it is good here as it rejects BCI even better. I didn’t choose an audio connector with a switch so I wired the power line of NE602 after the headphone, and I need to add 1uF to NE602 to avoid self-oscillation. The sensitivity is not high but it give good enough volume to a sensitive stereo headphone of 32 ohms in series if you have a standard size end feed or dipole antenna. And the noise pattern is quite good to hear.

The overall current draw is about 3mA so with a small battery pack of 3.7V 600mAh, I can hear about 200 hours! If you have all the parts on hand, please build and let me know your result. If you use Choc perf board to build this radio like me, I will really appreciate it.

<PastedGraphic-1.png>
<PastedGraphic-2.png>
<PastedGraphic-3.png>

Thanks,
Adam


Re: Tiny Toy Receiver

Rob <roomberg@...>
 

I pu tthe images here just for discussion.
I cut out the Xed parts..... and got this: 
http://www.learnmorsecode.com/DC/rong1.jpg
Am I reading this correctly?
PLUS VOLTS  to the NE602 is after the speaker?
and
what is 64-600 ohms mean?

Re: Tiny Toy Receiver

Adam Rong
 

Correct. The 1uf will filter the supply. 64 ohm means 32 ohm + 32 ohm. If you use voltage like 6V or higher, you can also use 300 ohm + 300 ohm like HD600 to achieve higher gain.

I know it is hard to believe but just give it a try and let me know if something goes wrong.

Thanks,
Adam

在 2018年10月15日,上午11:41,Rob via Groups.Io <roomberg@...> 写道:

I pu tthe images here just for discussion.
I cut out the Xed parts..... and got this: 
http://www.learnmorsecode.com/DC/rong1.jpg
Am I reading this correctly?
PLUS VOLTS  to the NE602 is after the speaker?
and
what is 64-600 ohms mean?

Re: Tiny Toy Receiver

Rob <roomberg@...>
 

Did you hand craft or buy the DIY7-7 coil?
http://www.learnmorsecode.com/DC/DIY7-7.jpg


On 10/15/2018 12:07 AM, Adam Rong wrote:
Correct. The 1uf will filter the supply. 64 ohm means 32 ohm + 32 ohm. If you use voltage like 6V or higher, you can also use 300 ohm + 300 ohm like HD600 to achieve higher gain.

I know it is hard to believe but just give it a try and let me know if something goes wrong.

Thanks,
Adam

在 2018年10月15日,上午11:41,Rob via Groups.Io <roomberg@...> 写道:

I pu tthe images here just for discussion.
I cut out the Xed parts..... and got this: 
http://www.learnmorsecode.com/DC/rong1.jpg
Am I reading this correctly?
PLUS VOLTS  to the NE602 is after the speaker?
and
what is 64-600 ohms mean?

Re: Tiny Toy Receiver

Rob <roomberg@...>
 

I am guessing these are no longer manufactured.
More translations landed me with this image:

http://www.learnmorsecode.com/DC/hambandcoil.jpg


On 10/15/2018 12:45 AM, Rob via Groups.Io wrote:
Did you hand craft or buy the DIY7-7 coil?
http://www.learnmorsecode.com/DC/DIY7-7.jpg


On 10/15/2018 12:07 AM, Adam Rong wrote:
Correct. The 1uf will filter the supply. 64 ohm means 32 ohm + 32 ohm. If you use voltage like 6V or higher, you can also use 300 ohm + 300 ohm like HD600 to achieve higher gain.

I know it is hard to believe but just give it a try and let me know if something goes wrong.

Thanks,
Adam

在 2018年10月15日,上午11:41,Rob via Groups.Io <roomberg@...> 写道:

I pu tthe images here just for discussion.
I cut out the Xed parts..... and got this: 
http://www.learnmorsecode.com/DC/rong1.jpg
Am I reading this correctly?
PLUS VOLTS  to the NE602 is after the speaker?
and
what is 64-600 ohms mean?


Re: Tiny Toy Receiver

Adam Rong
 

I have plenty in stock. I am selling at 1 USD each.

Thanks,
Adam

在 2018年10月15日,下午12:50,Rob via Groups.Io <roomberg@...> 写道:

I am guessing these are no longer manufactured.
More translations landed me with this image:

http://www.learnmorsecode.com/DC/hambandcoil.jpg


On 10/15/2018 12:45 AM, Rob via Groups.Io wrote:
Did you hand craft or buy the DIY7-7 coil?
http://www.learnmorsecode.com/DC/DIY7-7.jpg


On 10/15/2018 12:07 AM, Adam Rong wrote:
Correct. The 1uf will filter the supply. 64 ohm means 32 ohm + 32 ohm. If you use voltage like 6V or higher, you can also use 300 ohm + 300 ohm like HD600 to achieve higher gain.

I know it is hard to believe but just give it a try and let me know if something goes wrong.

Thanks,
Adam

在 2018年10月15日,上午11:41,Rob via Groups.Io <roomberg@...> 写道:

I pu tthe images here just for discussion.
I cut out the Xed parts..... and got this: 
http://www.learnmorsecode.com/DC/rong1.jpg
Am I reading this correctly?
PLUS VOLTS  to the NE602 is after the speaker?
and
what is 64-600 ohms mean?


Re: Tiny Toy Receiver

Adam Rong
 

Since the Li-Po battery pack of correct size is not easy to find, I modified the circuit a little bit to be compatible with rechargeable Ni-MH battery of 8.4 volt. The amber LED is used to decrease supply voltage about 1.8V. The overall current of about 6mA will be good for the LED, and it also can be used for power supply polarization protection. I also found 300 ohm will not be good for his radio since 1uf will filter too much higher side of audio spectrum. I also found the iPhone headset has impedance a bit more than 40 ohm and it is good for higher gain in this circuit.
image1.jpeg

If I may, I would call it inline receiver or TTR (Tiny Toy Receiver). The reason for inline is that it is actually connected between antenna cable and headphone cable.

Thanks,
Adam

在 2018年10月15日,下午1:23,Adam Rong <rongxh@...> 写道:

I have plenty in stock. I am selling at 1 USD each.

Thanks,
Adam

在 2018年10月15日,下午12:50,Rob via Groups.Io <roomberg@...> 写道:

I am guessing these are no longer manufactured.
More translations landed me with this image:

http://www.learnmorsecode.com/DC/hambandcoil.jpg


On 10/15/2018 12:45 AM, Rob via Groups.Io wrote:
Did you hand craft or buy the DIY7-7 coil?
http://www.learnmorsecode.com/DC/DIY7-7.jpg


On 10/15/2018 12:07 AM, Adam Rong wrote:
Correct. The 1uf will filter the supply. 64 ohm means 32 ohm + 32 ohm. If you use voltage like 6V or higher, you can also use 300 ohm + 300 ohm like HD600 to achieve higher gain.

I know it is hard to believe but just give it a try and let me know if something goes wrong.

Thanks,
Adam

在 2018年10月15日,上午11:41,Rob via Groups.Io <roomberg@...> 写道:

I pu tthe images here just for discussion.
I cut out the Xed parts..... and got this: 
http://www.learnmorsecode.com/DC/rong1.jpg
Am I reading this correctly?
PLUS VOLTS  to the NE602 is after the speaker?
and
what is 64-600 ohms mean?


Re: Tiny Toy Receiver

Adam Rong
 

If I connect this radio to my commercial radio, the carrier leakage will drive S meter to about S9 in CW mode. Pretty interesting and it could be used for S meter calibration?

Thanks,
Adam

在 2018年10月15日,下午9:34,Adam Rong <rongxh@...> 写道:

Since the Li-Po battery pack of correct size is not easy to find, I modified the circuit a little bit to be compatible with rechargeable Ni-MH battery of 8.4 volt. The amber LED is used to decrease supply voltage about 1.8V. The overall current of about 6mA will be good for the LED, and it also can be used for power supply polarization protection. I also found 300 ohm will not be good for his radio since 1uf will filter too much higher side of audio spectrum. I also found the iPhone headset has impedance a bit more than 40 ohm and it is good for higher gain in this circuit.
<image1.jpeg>

If I may, I would call it inline receiver or TTR (Tiny Toy Receiver). The reason for inline is that it is actually connected between antenna cable and headphone cable.

Thanks,
Adam

在 2018年10月15日,下午1:23,Adam Rong <rongxh@...> 写道:

I have plenty in stock. I am selling at 1 USD each.

Thanks,
Adam

在 2018年10月15日,下午12:50,Rob via Groups.Io <roomberg@...> 写道:

I am guessing these are no longer manufactured.
More translations landed me with this image:

http://www.learnmorsecode.com/DC/hambandcoil.jpg


On 10/15/2018 12:45 AM, Rob via Groups.Io wrote:
Did you hand craft or buy the DIY7-7 coil?
http://www.learnmorsecode.com/DC/DIY7-7.jpg


On 10/15/2018 12:07 AM, Adam Rong wrote:
Correct. The 1uf will filter the supply. 64 ohm means 32 ohm + 32 ohm. If you use voltage like 6V or higher, you can also use 300 ohm + 300 ohm like HD600 to achieve higher gain.

I know it is hard to believe but just give it a try and let me know if something goes wrong.

Thanks,
Adam

在 2018年10月15日,上午11:41,Rob via Groups.Io <roomberg@...> 写道:

I pu tthe images here just for discussion.
I cut out the Xed parts..... and got this:  
http://www.learnmorsecode.com/DC/rong1.jpg
Am I reading this correctly? 
PLUS VOLTS  to the NE602 is after the speaker?
and
what is 64-600 ohms mean? 



Re: Tiny Toy Receiver

Adam Rong
 

I pulled the 1uf and 103 near pin 8 or NE602 and it still works okay. Really cute little receiver!

Thanks,
Adam

Kangaroo 40 Meter SSB Transceiver - question

stellavox@...
 

Hello,

New member here.  I finally got around to finishing up this transceiver that I got from Ebay a few years ago.  It's uses DC conversion with the KK7B-derived phasing technique to generate and decode SSB.   I happened to compare the transmit circuitry and realize that it bascially the sae as the CR kits CS and KN transceivers that leads me to believe that it was designed by Adam.  Very well executed boards and parts. Documentation was minimal (and in Chinese) but I got it going successfully. 

Having a problem though.  Receive alternate sideband supression is not good.  I believe it may be a problem in the phasing circuitry design.  Would appreciate any help.

THANKS very much

Charles K1ETU

KN-Q7A

Charles Bright
 

Hello.  I'm cleaning up and downsizing and don't know if anyone would be interested, but I have a unbuilt KN-Q7A with crystals for 7.200-7.220 still in the USPS box as received.  If anyone might be, I'm open to offers and you may  contact me directly at we0r@....

Re: KN-Q7A

 

Charles,
i'm thinking of selling mine also but no idea what the rig is worth.
Did you find a buyer?
BOB AF2DX

STILL LOOKING

 

Hi gang,
while being sick last year much of my ham gear was taken.
I really miss the small 3 watt rock bound rig since I had lots of fun with it.
if anyone has one collecting dust please let me know if you care to sell or trade.
I will be moving to Atlantic City soon so I hope to do better with QRP near the salt water.
73
BOB AF2DX

Re: STILL LOOKING

Gary Freeman
 

Hi, Bob

 

Are you talking about the CRK10-A radio?  I have one I’m not using much and a bunch of crystals.  Let me know if no one else has what you’re looking for.

 

72 de Gary W0ITT (ex – WA0ZSU)

 

Sent from Mail for Windows 10

 


From: crkits@groups.io <crkits@groups.io> on behalf of pileupjunkie via Groups.Io <beargyrils@...>
Sent: Sunday, December 9, 2018 1:16:06 PM
To: crkits@groups.io
Subject: [crkits] STILL LOOKING
 
Hi gang,
while being sick last year much of my ham gear was taken.
I really miss the small 3 watt rock bound rig since I had lots of fun with it.
if anyone has one collecting dust please let me know if you care to sell or trade.
I will be moving to Atlantic City soon so I hope to do better with QRP near the salt water.
73
BOB AF2DX

Re: STILL LOOKING

 

Hi Gary your the only one that responded. Can you give me a price or maybe a trade? I have the SSB rug and it was built by Larry. Let me know and thanks for responding 73 Bob AF2DX

On Dec 9, 2018 9:27 PM, Gary Freeman <ZSUGF@...> wrote:

Hi, Bob

 

Are you talking about the CRK10-A radio?  I have one I’m not using much and a bunch of crystals.  Let me know if no one else has what you’re looking for.

 

72 de Gary W0ITT (ex – WA0ZSU)

 

Sent from Mail for Windows 10

 


From: crkits@groups.io <crkits@groups.io> on behalf of pileupjunkie via Groups.Io <beargyrils@...>
Sent: Sunday, December 9, 2018 1:16:06 PM
To: crkits@groups.io
Subject: [crkits] STILL LOOKING
 
Hi gang,
while being sick last year much of my ham gear was taken.
I really miss the small 3 watt rock bound rig since I had lots of fun with it.
if anyone has one collecting dust please let me know if you care to sell or trade.
I will be moving to Atlantic City soon so I hope to do better with QRP near the salt water.
73
BOB AF2DX

Re: STILL LOOKING

 


ZSUGF@...



-----Original Message-----
From: pileupjunkie via Groups.Io <beargyrils@...>
To: crkits <crkits@groups.io>
Sent: Mon, Dec 10, 2018 8:48 am
Subject: Re: [crkits] STILL LOOKING

Hi Gary your the only one that responded. Can you give me a price or maybe a trade? I have the SSB rug and it was built by Larry. Let me know and thanks for responding 73 Bob AF2DX

On Dec 9, 2018 9:27 PM, Gary Freeman <ZSUGF@...> wrote:
Hi, Bob
 
Are you talking about the CRK10-A radio?  I have one I’m not using much and a bunch of crystals.  Let me know if no one else has what you’re looking for.
 
72 de Gary W0ITT (ex – WA0ZSU)
 
Sent from Mail for Windows 10
 

From: crkits@groups.io <crkits@groups.io> on behalf of pileupjunkie via Groups.Io <beargyrils@...>
Sent: Sunday, December 9, 2018 1:16:06 PM
To: crkits@groups.io
Subject: [crkits] STILL LOOKING
 
Hi gang,
while being sick last year much of my ham gear was taken.
I really miss the small 3 watt rock bound rig since I had lots of fun with it.
if anyone has one collecting dust please let me know if you care to sell or trade.
I will be moving to Atlantic City soon so I hope to do better with QRP near the salt water.
73
BOB AF2DX

Re: STILL LOOKING

Gary Freeman
 

Hi. Bob

 

I have a CRK10-A (for 40 meters) that I made 150+ QSO’s on.  I haven’t used it much in the past year or so because I got into building radios and now have a dozen pieces of QRP gear (I like QRP a lot).

 

My radio was also built by Larry:  he added actual crystal sockets to mine, so I could explore other frequencies.  (You do have to open up the radio to change the crystals). 

 

Right now the radio has a crystal set installed for 7.033 MHz, and if you want it I will include a second set of crystals for another frequency.

 

I’m asking $55.  In the interest of getting it a nice home, I will pay shipping to get it to you.

 

Let me know what you think.  If you’d like it we can figure out arrangements.

 

72 de Gary W0ITT

 

 

 

 

 

 

 

Sent from Mail for Windows 10

 


From: crkits@groups.io <crkits@groups.io> on behalf of pileupjunkie via Groups.Io <beargyrils@...>
Sent: Monday, December 10, 2018 2:11:52 PM
To: crkits@groups.io; ZSUGF@...
Subject: Re: [crkits] STILL LOOKING
 

ZSUGF@...



-----Original Message-----
From: pileupjunkie via Groups.Io <beargyrils@...>
To: crkits <crkits@groups.io>
Sent: Mon, Dec 10, 2018 8:48 am
Subject: Re: [crkits] STILL LOOKING

Hi Gary your the only one that responded. Can you give me a price or maybe a trade? I have the SSB rug and it was built by Larry. Let me know and thanks for responding 73 Bob AF2DX

On Dec 9, 2018 9:27 PM, Gary Freeman <ZSUGF@...> wrote:
Hi, Bob
 
Are you talking about the CRK10-A radio?  I have one I’m not using much and a bunch of crystals.  Let me know if no one else has what you’re looking for.
 
72 de Gary W0ITT (ex – WA0ZSU)
 
Sent from Mail for Windows 10
 

From: crkits@groups.io <crkits@groups.io> on behalf of pileupjunkie via Groups.Io <beargyrils@...>
Sent: Sunday, December 9, 2018 1:16:06 PM
To: crkits@groups.io
Subject: [crkits] STILL LOOKING
 
Hi gang,
while being sick last year much of my ham gear was taken.
I really miss the small 3 watt rock bound rig since I had lots of fun with it.
if anyone has one collecting dust please let me know if you care to sell or trade.
I will be moving to Atlantic City soon so I hope to do better with QRP near the salt water.
73
BOB AF2DX

Sold out: CS-series and Sandwich digital VFO

Adam Rong
 

Folks,

CS-series, Sandwich digital VFO and Choc perfboard are sold out. Likely I will not continue these kits and parts. If you still need these, please contact my distributors.

Other kits are still on sale. Don’t miss the opportunity to get free shipping and discount. Check out the web shop at:

http://crkits.com

Thanks,
Adam, BD6CR

Video Upload: Build a Simple RX

Adam Rong
 

See this video:

Schematic:


Thanks,
Adam

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