Date   

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


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
 

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 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

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

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

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@...>
 

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
 

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

Jim Pruitt
 

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.


Thanks,
Adam


Tiny Toy Receiver

Adam Rong
 

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.


Thanks,
Adam


HT-1A SOTA video

Adam Rong
 

https://www.youtube.com/watch?v=47a-cXd_PIY&feature=youtu.be

FB SOTA video from Japan but you can see English.

Thanks,
Adam


Re: Year end big promotions

Adam Rong
 

Hi WR6S,

I have sent the invoice.

Guys,

Please contact offline by email rongxh@...

Thanks,
Adam


Re: Year end big promotions

Cues Ahero
 

Hi,would like a crk10 and 2 sandwich vfo,s if available. Paypal invoice cool.thanks,wr6s


On Wed, Oct 3, 2018, 5:04 PM Adam Rong <rongxh@...> wrote:
Gang,

I plan to clean out some items of my stock so I have the following additional discount (still free shipping but 10% off for 2nd purchase will not apply) available until the end of this year.

R3500D assembled ARDF receiver for 3500-3600 kHz  32 USD each
PJ-2D assembled ARDF receiver for 2 meter band  90 USD each (2 pcs remaining)
CRK-10A CW transceiver  35 USD each
Sandwich digital VFO  15 USD each
HT-1A kit 125 USD each
HT-1A assembled radio 150 USD each
10 pcs Choc perf board  20 USD each
DIY7 series coils (3.8, 7, 14, 21) 1 USD each

Email order will be accepted. I can send invoice through PayPal so you can pay with credit card via PayPal.

Thanks,
Adam

> 在 2018年9月11日,上午9:58,Adam Rong <rongxh@...> 写道:
>
> Gang,
>
> This is the 7th year of my kit business. Starting from October 1 (shipping date) till the end of this year, I will offer discount as follows:
>
> 1. All products on http://crkits.com will be free shipping to worldwide.
> 2. If you buy the second pcs of a product, you get 10% off. So invite your friend to buy along so both of you can get 5% off.
> 3. You can place orders now to qualify the above discount if you accept shipping later than Oct 1.
>
> Thanks,
> Adam
>
>




Re: Year end big promotions

Adam Rong
 

Gang,

I plan to clean out some items of my stock so I have the following additional discount (still free shipping but 10% off for 2nd purchase will not apply) available until the end of this year.

R3500D assembled ARDF receiver for 3500-3600 kHz 32 USD each
PJ-2D assembled ARDF receiver for 2 meter band 90 USD each (2 pcs remaining)
CRK-10A CW transceiver 35 USD each
Sandwich digital VFO 15 USD each
HT-1A kit 125 USD each
HT-1A assembled radio 150 USD each
10 pcs Choc perf board 20 USD each
DIY7 series coils (3.8, 7, 14, 21) 1 USD each

Email order will be accepted. I can send invoice through PayPal so you can pay with credit card via PayPal.

Thanks,
Adam

在 2018年9月11日,上午9:58,Adam Rong <rongxh@...> 写道:

Gang,

This is the 7th year of my kit business. Starting from October 1 (shipping date) till the end of this year, I will offer discount as follows:

1. All products on http://crkits.com will be free shipping to worldwide.
2. If you buy the second pcs of a product, you get 10% off. So invite your friend to buy along so both of you can get 5% off.
3. You can place orders now to qualify the above discount if you accept shipping later than Oct 1.

Thanks,
Adam


Re: PA0RDT mini whip on Choc board

Adam Rong
 

It seems that the photo did not show correctly. Here it is.
image1.jpeg

Thanks,
Adam

在 2018年9月29日,下午11:19,Adam Rong <rongxh@...> 写道:

Gang,

I made some changes to the mini whip to keep the 2nd stage 2N5109 amplifier and add a relay to switch my end feed half wave antenna, so I now have two antennas, with and without amplifier. I connected to two connectors on my TS-590S and switch them. The amplifier works great for the non-resonant bands, especially for Long Wave and Medium Wave bands and 6 meter band. The added amplifier will not cause noticeable overload to receiver front end due to the big current of more than 30 mA. What makes me happy, is that the Choc perf board works great again with the modified circuit! Enjoy the photo.

Thanks,
Adam


Re: PA0RDT mini whip on Choc board

Adam Rong
 

Gang,

I made some changes to the mini whip to keep the 2nd stage 2N5109 amplifier and add a relay to switch my end feed half wave antenna, so I now have two antennas, with and without amplifier. I connected to two connectors on my TS-590S and switch them. The amplifier works great for the non-resonant bands, especially for Long Wave and Medium Wave bands and 6 meter band. The added amplifier will not cause noticeable overload to receiver front end due to the big current of more than 30 mA. What makes me happy, is that the Choc perf board works great again with the modified circuit! Enjoy the photo.

Thanks,
Adam


Re: HT-1A videos uploaded

mx6s@...
 

Fisal, Timothy, Adam and All,

Though this is not in English, HT-1A SSB sound is uploaded to the Youtube.
I tuned around domestic contest CQ.

https://www.youtube.com/watch?time_continue=1&v=q-EwkvYKK5I

As I listened to the HT-1A in LSB mode, tone is mild and enjoyable to hear long time.
Boat anchor AM stations and real BC stations are sounds nice too except music program.

Thank you.

Junichi JL1KRA


PA0RDT mini whip on Choc board

Adam Rong
 

Gang,

My friend BA4EO asked me to make a mini whip for his Long Wave RX, and I made in 2 hours. It is actually a two stage amplifier including J310 and 2N5109. The antenna plate is also made by Choc board, hihi. It performs quite well.




Thanks,
Adam


Re: Still remember KN-Q7A?

Adam Rong
 

And here is the photo.
image1.jpeg
And the spectrum.
image2.jpeg
Thanks,
Adam

在 2018年9月20日,上午1:05,Adam Rong <rongxh@...> 写道:

I made another receiver and posted a comparison audio file to a forum. People  prefer my radio instead of my TS-940. A lot of fun! The way to replace MC1350 will cause more changes on GAIN control. Some additional wiring will be required.

Thanks
Adam

在 2018年9月18日,上午12:53,Adam Rong <rongxh@...> 写道:

Norm,

Thanks for the suggestions. For now, I just use crystals on hand to make a receiver for fun. I just get tired of the modern digital processing radios. I just need an analog radio with low power consumption.

Speaking of the receiver, I did have another one with 4 crystals and 39pF for IF filter and 2N3904 in the place of MC1350. The sensitivity and selectivity are both okay and I believe the noise pattern and audio is more favorable to me. Probably I will build another one to make sure it will work that way and make a simple receiver kit at low cost. This kind of receiver kit will be the platform for hams to experiment. You can add transmitter circuit by yourself, or add multiple band options, or display options etc. You have enough room and you just pay less for the platform.

Thanks,
Adam

在 2018年9月17日,下午3:25,marjannorm <marjannorm@...> 写道:

Hi Adam.   The KN-Q7A is a very good rig indeed, no doubt about that.   If you are designing a receiver from scratch on 40m, then 7.000 through to 7.150 at least is a must, because Parks on the Air, SOTA, and other portable operations use 7.140 through to .150.    And - AND, then there is the CW qrp operations at the lower end of the band.   The LED tuning is ok, and gets around a problem, but a small LCD display smaller that the usual 16x2 would be a real advantage.
Just my thoughts.  Keep up the good work
Norm vk5gi
McLaren Vale
South Australia