Date   
Re: tech-talk2

Trystan G0KAY
 

Leland & Hans,

Thank you both, I've joined that group now, so hopefully I will learn something and send my soldering iron on new adventures.

Re: Which Version of Arduino Uno Board to Buy?

Ken KM4NFQ
 

Hello Al, W4KY,

That eBay Arduino UNO, or any other development board called an
Arduino UNO should work. You will be using it as an ISP programmer.
You will use the Arduino IDE > Tools > Programmer: > Arduino as ISP to
reset the ATmega328P microcontroller on the Arduino UNO to act as an
ISP programmer. Or, you can buy an actual ISP programmer, as the first
reply suggested. Or get both the Arduino UNO board AND the ISP
programmer and experiment to find out which one is easier to use. I
suggest getting the Arduino UNO and following the tutorial. Good Luck,
and Best Wishes for success in updating the firmware.

Regards,
Ken, KM4NFQ "Not Fully Qualified"
https://github.com/muurtikaar/mega-morse-tutor

On Sat, Nov 9, 2019 at 2:00 AM Al Clark <hotdogx@...> wrote:

I have a QCX 40 that I built a little over a year ago (works fine too). I just got a new chip from QRP Labs that contain the 1.01a firmware, but now the firmware is 1.2. So I see I need to learn how to update the firmware myself. I'm a total newbie on this - have never done it before. My computer runs Windows 10 64 bit. In reading Simon's tutorial I see I need to get an Arduino Uno. Looking at Ebay there are at least two versions of Arduino Uno being offered. I think I need this one. Is that correct? https://www.ebay.com/itm/UNO-R3-ATmega328P-ATmega16U2-Development-Board-USB-Cable-for-ARDUINO/382562493073?_trkparms=ispr%3D1&hash=item5912806291:g:lSgAAOSwYxdbmCqe&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qX7pfIeYZJArP6CMJBEgucvWhcuMx3Cs0iBtYzZa2Sm%2BwC8qHnGMi28OJ0SpB3ehgBqHafj%2Baj8uOxUdwkmiFKHmBqwHFttgUUY6GZGr1BsWCMTYK2fWcbGauATshtQFY9guf1%2BEWsVEVlMep75hUHfX9Vp2hHfjq9fnOK0MvMSyTYsJ0IajcAtOJibCBzwE%2BiWQdK5kMmtUYGDWMjVuGs5WUHl6OodDZhUfKH2gBtxFuD6bfTFQlHZezzM5vPf8CNcIQR%2Fif2xXSyCMl%2BYa2a2KmmLzVyTUHWC2U6xJ6FACNfkpqqYnlxqqgOT5kwY0MaZv6k1Iqf%2F2RXvxY2Qpjhh2OvDilMYcqrbs1tMX28hUdjy8kPPwAqUFPCnXrRDdb%2FRk3y1BbiKcUmx8R%2Btj11sf2mxV3mnxdxAZSnh40XyewMLaA0FpCNAaTVNu78yyDMq%2BveuPlwlWEEJcAHb8DC3DMy%2BtIxTjtPcCqeecnpifMTxbC8uvdeUcgRagjBh87CUixs4FI1GOf%2BzZfZP0Upi5mpIiW0qmEozUp7JDyAV%2FYgFfqvjLdgp%2BLur2kqU%2BM9LCVtQsDGVjgEiXon2J8zHVmXqClm4F3UiQ3N8OXJCeRPJlEEWcNY%2BIpSzK%2F3tVmmrGV%2Fvlq74suomlUFy%2Bp%2B5f26qwORb%2FsCkzEhecj1XAcUlp6riIlh1yydLeg5sjMtkHJrSlVLN%2B32SE5mGVAZX3Klr9PYNR0v2P7xVOfQFZg%3D%3D&checksum=382562493073a3c2e2e324584c8189e83a52d7b6782c&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qX7pfIeYZJArP6CMJBEgucvWhcuMx3Cs0iBtYzZa2Sm%2BwC8qHnGMi28OJ0SpB3ehgBqHafj%2Baj8uOxUdwkmiFKHmBqwHFttgUUY6GZGr1BsWCMTYK2fWcbGauATshtQFY9guf1%2BEWsVEVlMep75hUHfX9Vp2hHfjq9fnOK0MvMSyTYsJ0IajcAtOJibCBzwE%2BiWQdK5kMmtUYGDWMjVuGs5WUHl6OodDZhUfKH2gBtxFuD6bfTFQlHZezzM5vPf8CNcIQR%2Fif2xXSyCMl%2BYa2a2KmmLzVyTUHWC2U6xJ6FACNfkpqqYnlxqqgOT5kwY0MaZv6k1Iqf%2F2RXvxY2Qpjhh2OvDilMYcqrbs1tMX28hUdjy8kPPwAqUFPCnXrRDdb%2FRk3y1BbiKcUmx8R%2Btj11sf2mxV3mnxdxAZSnh40XyewMLaA0FpCNAaTVNu78yyDMq%2BveuPlwlWEEJcAHb8DC3DMy%2BtIxTjtPcCqeecnpifMTxbC8uvdeUcgRagjBh87CUixs4FI1GOf%2BzZfZP0Upi5mpIiW0qmEozUp7JDyAV%2FYgFfqvjLdgp%2BLur2kqU%2BM9LCVtQsDGVjgEiXon2J8zHVmXqClm4F3UiQ3N8OXJCeRPJlEEWcNY%2BIpSzK%2F3tVmmrGV%2Fvlq74suomlUFy%2Bp%2B5f26qwORb%2FsCkzEhecj1XAcUlp6riIlh1yydLeg5sjMtkHJrSlVLN%2B32SE5mGVAZX3Klr9PYNR0v2P7xVOfQFZg%3D%3D&checksum=382562493073a3c2e2e324584c8189e83a52d7b6782c
--
Al W4KY

Re: Which Version of Arduino Uno Board to Buy?

Alan G4ZFQ
 

AVRDUDESS prevents you from wiping the EEPROM side of things when you press program.
James,

The fuse setting of the QCX is what should stop EEPROM erasure.
In view of problems seen recently it may be worth checking the fuses first.
But I suggest a beginner does not use the "Program!" button.
The "Go" button under the Flash box only writes the .hex, nothing else.

73 Alan G4ZFQ

Re: Which Version of Arduino Uno Board to Buy?

Alan G4ZFQ
 

James Anderson wrote:
There’s also this style of programmer too.
Both plug directly into most if not all QRPLAB pcb.
Yes,

This is the type I use. No need to play around with Arduino.
Plug it in, run the driver installer if it is not automatically assigned.
Run Averdudess.
Done.
I've got some notes here https://sites.google.com/site/g4zfqradio/progrock_update keep meaning to make it more clear.

73 Alan G4ZFQ

https://m.ebay.co.uk/itm/USB-ISP-USBASP-Programmer-AVR-ATMEL-ATMega8-Download-Pin-IDC-Cable-3-3V-5V-UK/182084372891?ul_ref=https://rover.ebay.com/rover/1/710-53481-19255-0/1?ff3=2&pub=5575376664&toolid=10001&campid=5338268676&customid=CjwKCAiAwZTuBRAYEiwAcr67OQErjrvcf6XDCw-_sSOu3xVwSJYxMoTVK8X6BjYQ2SI0KKJtK4_SZxoCmqcQAvD_BwE&lgeo=1&item=182084372891&srcrot=710-53481-19255-0&rvr_id=2174287548979&rvr_ts=4f0d35cb16e0a4e8c775fd77ffdf755f&_mwBanner=1&_rdt=1&ul_noapp=true&pageci=a15a9bfd-6f55-4fd3-935f-111f68c9ed6d

On 9 Nov 2019, at 07:23, James Anderson <james21170@...> wrote:

Re: Which Version of Arduino Uno Board to Buy?

James Anderson
 

I'd also recommend looking at posts within this forum on how to use AVRDUDESS too as you could wipe your new Atmega328 chip so be cautious before pressing program.  
I think I've read somewhere recently that the newest version of AVRDUDESS prevents you from wiping the EEPROM side of things when you press program.
Again, it's somewhere on this group.

Kind regards, James.

Re: Which Version of Arduino Uno Board to Buy?

James Anderson
 

On 9 Nov 2019, at 07:23, James Anderson <james21170@...> wrote:


Good morning Al. 

Forget the Arduino. Go for something like this. 
It’s much easier to use with programs like AVRDUDESS. 




On 9 Nov 2019, at 07:00, Al Clark <hotdogx@...> wrote:

I have a QCX 40 that I built a little over a year ago (works fine too).  I just got a new chip from QRP Labs that contain the 1.01a firmware, but now the firmware is 1.2.  So I see I need to learn how to update the firmware myself.  I'm a total newbie on this - have never done it before.  My computer runs Windows 10 64 bit.  In reading Simon's tutorial I see I need to get an Arduino Uno.  Looking at Ebay there are at least two versions of Arduino Uno being offered.  I think I need this one.  Is that correct?  https://www.ebay.com/itm/UNO-R3-ATmega328P-ATmega16U2-Development-Board-USB-Cable-for-ARDUINO/382562493073?_trkparms=ispr%3D1&hash=item5912806291:g:lSgAAOSwYxdbmCqe&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qX7pfIeYZJArP6CMJBEgucvWhcuMx3Cs0iBtYzZa2Sm%2BwC8qHnGMi28OJ0SpB3ehgBqHafj%2Baj8uOxUdwkmiFKHmBqwHFttgUUY6GZGr1BsWCMTYK2fWcbGauATshtQFY9guf1%2BEWsVEVlMep75hUHfX9Vp2hHfjq9fnOK0MvMSyTYsJ0IajcAtOJibCBzwE%2BiWQdK5kMmtUYGDWMjVuGs5WUHl6OodDZhUfKH2gBtxFuD6bfTFQlHZezzM5vPf8CNcIQR%2Fif2xXSyCMl%2BYa2a2KmmLzVyTUHWC2U6xJ6FACNfkpqqYnlxqqgOT5kwY0MaZv6k1Iqf%2F2RXvxY2Qpjhh2OvDilMYcqrbs1tMX28hUdjy8kPPwAqUFPCnXrRDdb%2FRk3y1BbiKcUmx8R%2Btj11sf2mxV3mnxdxAZSnh40XyewMLaA0FpCNAaTVNu78yyDMq%2BveuPlwlWEEJcAHb8DC3DMy%2BtIxTjtPcCqeecnpifMTxbC8uvdeUcgRagjBh87CUixs4FI1GOf%2BzZfZP0Upi5mpIiW0qmEozUp7JDyAV%2FYgFfqvjLdgp%2BLur2kqU%2BM9LCVtQsDGVjgEiXon2J8zHVmXqClm4F3UiQ3N8OXJCeRPJlEEWcNY%2BIpSzK%2F3tVmmrGV%2Fvlq74suomlUFy%2Bp%2B5f26qwORb%2FsCkzEhecj1XAcUlp6riIlh1yydLeg5sjMtkHJrSlVLN%2B32SE5mGVAZX3Klr9PYNR0v2P7xVOfQFZg%3D%3D&checksum=382562493073a3c2e2e324584c8189e83a52d7b6782c&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qX7pfIeYZJArP6CMJBEgucvWhcuMx3Cs0iBtYzZa2Sm%2BwC8qHnGMi28OJ0SpB3ehgBqHafj%2Baj8uOxUdwkmiFKHmBqwHFttgUUY6GZGr1BsWCMTYK2fWcbGauATshtQFY9guf1%2BEWsVEVlMep75hUHfX9Vp2hHfjq9fnOK0MvMSyTYsJ0IajcAtOJibCBzwE%2BiWQdK5kMmtUYGDWMjVuGs5WUHl6OodDZhUfKH2gBtxFuD6bfTFQlHZezzM5vPf8CNcIQR%2Fif2xXSyCMl%2BYa2a2KmmLzVyTUHWC2U6xJ6FACNfkpqqYnlxqqgOT5kwY0MaZv6k1Iqf%2F2RXvxY2Qpjhh2OvDilMYcqrbs1tMX28hUdjy8kPPwAqUFPCnXrRDdb%2FRk3y1BbiKcUmx8R%2Btj11sf2mxV3mnxdxAZSnh40XyewMLaA0FpCNAaTVNu78yyDMq%2BveuPlwlWEEJcAHb8DC3DMy%2BtIxTjtPcCqeecnpifMTxbC8uvdeUcgRagjBh87CUixs4FI1GOf%2BzZfZP0Upi5mpIiW0qmEozUp7JDyAV%2FYgFfqvjLdgp%2BLur2kqU%2BM9LCVtQsDGVjgEiXon2J8zHVmXqClm4F3UiQ3N8OXJCeRPJlEEWcNY%2BIpSzK%2F3tVmmrGV%2Fvlq74suomlUFy%2Bp%2B5f26qwORb%2FsCkzEhecj1XAcUlp6riIlh1yydLeg5sjMtkHJrSlVLN%2B32SE5mGVAZX3Klr9PYNR0v2P7xVOfQFZg%3D%3D&checksum=382562493073a3c2e2e324584c8189e83a52d7b6782c 
--
Al W4KY

Re: Which Version of Arduino Uno Board to Buy?

James Anderson
 

On 9 Nov 2019, at 07:00, Al Clark <hotdogx@...> wrote:

I have a QCX 40 that I built a little over a year ago (works fine too).  I just got a new chip from QRP Labs that contain the 1.01a firmware, but now the firmware is 1.2.  So I see I need to learn how to update the firmware myself.  I'm a total newbie on this - have never done it before.  My computer runs Windows 10 64 bit.  In reading Simon's tutorial I see I need to get an Arduino Uno.  Looking at Ebay there are at least two versions of Arduino Uno being offered.  I think I need this one.  Is that correct?  https://www.ebay.com/itm/UNO-R3-ATmega328P-ATmega16U2-Development-Board-USB-Cable-for-ARDUINO/382562493073?_trkparms=ispr%3D1&hash=item5912806291:g:lSgAAOSwYxdbmCqe&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qX7pfIeYZJArP6CMJBEgucvWhcuMx3Cs0iBtYzZa2Sm%2BwC8qHnGMi28OJ0SpB3ehgBqHafj%2Baj8uOxUdwkmiFKHmBqwHFttgUUY6GZGr1BsWCMTYK2fWcbGauATshtQFY9guf1%2BEWsVEVlMep75hUHfX9Vp2hHfjq9fnOK0MvMSyTYsJ0IajcAtOJibCBzwE%2BiWQdK5kMmtUYGDWMjVuGs5WUHl6OodDZhUfKH2gBtxFuD6bfTFQlHZezzM5vPf8CNcIQR%2Fif2xXSyCMl%2BYa2a2KmmLzVyTUHWC2U6xJ6FACNfkpqqYnlxqqgOT5kwY0MaZv6k1Iqf%2F2RXvxY2Qpjhh2OvDilMYcqrbs1tMX28hUdjy8kPPwAqUFPCnXrRDdb%2FRk3y1BbiKcUmx8R%2Btj11sf2mxV3mnxdxAZSnh40XyewMLaA0FpCNAaTVNu78yyDMq%2BveuPlwlWEEJcAHb8DC3DMy%2BtIxTjtPcCqeecnpifMTxbC8uvdeUcgRagjBh87CUixs4FI1GOf%2BzZfZP0Upi5mpIiW0qmEozUp7JDyAV%2FYgFfqvjLdgp%2BLur2kqU%2BM9LCVtQsDGVjgEiXon2J8zHVmXqClm4F3UiQ3N8OXJCeRPJlEEWcNY%2BIpSzK%2F3tVmmrGV%2Fvlq74suomlUFy%2Bp%2B5f26qwORb%2FsCkzEhecj1XAcUlp6riIlh1yydLeg5sjMtkHJrSlVLN%2B32SE5mGVAZX3Klr9PYNR0v2P7xVOfQFZg%3D%3D&checksum=382562493073a3c2e2e324584c8189e83a52d7b6782c&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qX7pfIeYZJArP6CMJBEgucvWhcuMx3Cs0iBtYzZa2Sm%2BwC8qHnGMi28OJ0SpB3ehgBqHafj%2Baj8uOxUdwkmiFKHmBqwHFttgUUY6GZGr1BsWCMTYK2fWcbGauATshtQFY9guf1%2BEWsVEVlMep75hUHfX9Vp2hHfjq9fnOK0MvMSyTYsJ0IajcAtOJibCBzwE%2BiWQdK5kMmtUYGDWMjVuGs5WUHl6OodDZhUfKH2gBtxFuD6bfTFQlHZezzM5vPf8CNcIQR%2Fif2xXSyCMl%2BYa2a2KmmLzVyTUHWC2U6xJ6FACNfkpqqYnlxqqgOT5kwY0MaZv6k1Iqf%2F2RXvxY2Qpjhh2OvDilMYcqrbs1tMX28hUdjy8kPPwAqUFPCnXrRDdb%2FRk3y1BbiKcUmx8R%2Btj11sf2mxV3mnxdxAZSnh40XyewMLaA0FpCNAaTVNu78yyDMq%2BveuPlwlWEEJcAHb8DC3DMy%2BtIxTjtPcCqeecnpifMTxbC8uvdeUcgRagjBh87CUixs4FI1GOf%2BzZfZP0Upi5mpIiW0qmEozUp7JDyAV%2FYgFfqvjLdgp%2BLur2kqU%2BM9LCVtQsDGVjgEiXon2J8zHVmXqClm4F3UiQ3N8OXJCeRPJlEEWcNY%2BIpSzK%2F3tVmmrGV%2Fvlq74suomlUFy%2Bp%2B5f26qwORb%2FsCkzEhecj1XAcUlp6riIlh1yydLeg5sjMtkHJrSlVLN%2B32SE5mGVAZX3Klr9PYNR0v2P7xVOfQFZg%3D%3D&checksum=382562493073a3c2e2e324584c8189e83a52d7b6782c 
--
Al W4KY

Which Version of Arduino Uno Board to Buy?

Al Clark
 

I have a QCX 40 that I built a little over a year ago (works fine too).  I just got a new chip from QRP Labs that contain the 1.01a firmware, but now the firmware is 1.2.  So I see I need to learn how to update the firmware myself.  I'm a total newbie on this - have never done it before.  My computer runs Windows 10 64 bit.  In reading Simon's tutorial I see I need to get an Arduino Uno.  Looking at Ebay there are at least two versions of Arduino Uno being offered.  I think I need this one.  Is that correct?  https://www.ebay.com/itm/UNO-R3-ATmega328P-ATmega16U2-Development-Board-USB-Cable-for-ARDUINO/382562493073?_trkparms=ispr%3D1&hash=item5912806291:g:lSgAAOSwYxdbmCqe&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qX7pfIeYZJArP6CMJBEgucvWhcuMx3Cs0iBtYzZa2Sm%2BwC8qHnGMi28OJ0SpB3ehgBqHafj%2Baj8uOxUdwkmiFKHmBqwHFttgUUY6GZGr1BsWCMTYK2fWcbGauATshtQFY9guf1%2BEWsVEVlMep75hUHfX9Vp2hHfjq9fnOK0MvMSyTYsJ0IajcAtOJibCBzwE%2BiWQdK5kMmtUYGDWMjVuGs5WUHl6OodDZhUfKH2gBtxFuD6bfTFQlHZezzM5vPf8CNcIQR%2Fif2xXSyCMl%2BYa2a2KmmLzVyTUHWC2U6xJ6FACNfkpqqYnlxqqgOT5kwY0MaZv6k1Iqf%2F2RXvxY2Qpjhh2OvDilMYcqrbs1tMX28hUdjy8kPPwAqUFPCnXrRDdb%2FRk3y1BbiKcUmx8R%2Btj11sf2mxV3mnxdxAZSnh40XyewMLaA0FpCNAaTVNu78yyDMq%2BveuPlwlWEEJcAHb8DC3DMy%2BtIxTjtPcCqeecnpifMTxbC8uvdeUcgRagjBh87CUixs4FI1GOf%2BzZfZP0Upi5mpIiW0qmEozUp7JDyAV%2FYgFfqvjLdgp%2BLur2kqU%2BM9LCVtQsDGVjgEiXon2J8zHVmXqClm4F3UiQ3N8OXJCeRPJlEEWcNY%2BIpSzK%2F3tVmmrGV%2Fvlq74suomlUFy%2Bp%2B5f26qwORb%2FsCkzEhecj1XAcUlp6riIlh1yydLeg5sjMtkHJrSlVLN%2B32SE5mGVAZX3Klr9PYNR0v2P7xVOfQFZg%3D%3D&checksum=382562493073a3c2e2e324584c8189e83a52d7b6782c&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qX7pfIeYZJArP6CMJBEgucvWhcuMx3Cs0iBtYzZa2Sm%2BwC8qHnGMi28OJ0SpB3ehgBqHafj%2Baj8uOxUdwkmiFKHmBqwHFttgUUY6GZGr1BsWCMTYK2fWcbGauATshtQFY9guf1%2BEWsVEVlMep75hUHfX9Vp2hHfjq9fnOK0MvMSyTYsJ0IajcAtOJibCBzwE%2BiWQdK5kMmtUYGDWMjVuGs5WUHl6OodDZhUfKH2gBtxFuD6bfTFQlHZezzM5vPf8CNcIQR%2Fif2xXSyCMl%2BYa2a2KmmLzVyTUHWC2U6xJ6FACNfkpqqYnlxqqgOT5kwY0MaZv6k1Iqf%2F2RXvxY2Qpjhh2OvDilMYcqrbs1tMX28hUdjy8kPPwAqUFPCnXrRDdb%2FRk3y1BbiKcUmx8R%2Btj11sf2mxV3mnxdxAZSnh40XyewMLaA0FpCNAaTVNu78yyDMq%2BveuPlwlWEEJcAHb8DC3DMy%2BtIxTjtPcCqeecnpifMTxbC8uvdeUcgRagjBh87CUixs4FI1GOf%2BzZfZP0Upi5mpIiW0qmEozUp7JDyAV%2FYgFfqvjLdgp%2BLur2kqU%2BM9LCVtQsDGVjgEiXon2J8zHVmXqClm4F3UiQ3N8OXJCeRPJlEEWcNY%2BIpSzK%2F3tVmmrGV%2Fvlq74suomlUFy%2Bp%2B5f26qwORb%2FsCkzEhecj1XAcUlp6riIlh1yydLeg5sjMtkHJrSlVLN%2B32SE5mGVAZX3Klr9PYNR0v2P7xVOfQFZg%3D%3D&checksum=382562493073a3c2e2e324584c8189e83a52d7b6782c 
--
Al W4KY

Re: #qcx Firmware version 1.02 release #qcx

Hans Summers
 

Hi Tom, Chopper

Thanks, I will check this... 

73 Hans G0UPL

On Sat, Nov 9, 2019 at 7:05 AM Tom N9GVP <tsnyder35@...> wrote:
I find that the sidetone issue in T102a occurs when the keyer menu is set for straight key, but the issue does not occur not when set for an iambic paddle.  That's kind of curious.

QCX-40 MTRS

Doug Edwards <wb6lxa@...>
 

Hi group! I am a fairly new member of the group and a while back I purchased a QCX-40 kit. I have been paying attention to the problems and fixes of both the members and Han's addressed, a lot of fun! I have been fairly slowly stuffing parts into the board and using my old trusted Weller wtcp station to solder them in. I have had a few problems and Han's has been very patient and kind answering questions. I am an old retired communications (RF) technician so it is fun to figure out mistakes if made. Today, finally, I fired up and calibrated my qcx. It has a ton of unwanted wideband rejection (better than 30db@ sideline freq) will measure more accurately when I  get my sig gen out of storage Transmit section producing 3.5 watts @13.5 volts. Horayy! Tnx for help group! 72's, Doug, KM6OR

Re: 20 Watt QRPLabs Dummy Load for Sale?

Shirley Dulcey KE1L
 

I named carbon composition (the old kind) and carbon film (the common cheap resistors now). Both are suitable, at least in low resistance values. Carbon film resistors are easier to damage with overloads than carbon composition, so make sure to size your load appropriately. Carbon film resistors have more inductance than carbon composition, but it's not a big problem at HF frequencies with low value resistors like the ones you will use in a dummy load.

Surface mount thick film resistors are even better; their construction has low inductance. But keep their power rating in mind. 1206 resistors, the largest ones commonly seen in SMD construction, are rated for 1/4 watt. The smaller 0805 resistors are rated for 1/8 watt. 0603, the smallest resistors likely to be found in ham projects, are 1/10 watt. There are larger sizes that can handle more power; 1210 resistors are rated for 1/2 watt and 1812 resistors can handle a full watt. Power handling will be affected by air circulation.

Dummy loads usually don't need high precision resistors, so you won't need the fancier kinds like metal film. Any sort of wirewould resistor is right out!


On Fri, Nov 8, 2019 at 6:38 PM geoff M0ORE via Groups.Io <m0ore=tiscali.co.uk@groups.io> wrote:

Be careful when choosing the resistors for a dummy load. Some can be inductive due to the method of construction. The very old fashioned carbon are most likely to be best. Cost is not an indication of the suitability for a dummy load.


On 08/11/2019 23:15, Shirley Dulcey KE1L wrote:
Even without a kit, most home builders can assemble a do-it-yourself dummy load.

The essential ingredient is a collection of ordinary carbon composition or carbon film resistors that add up to 50 ohms in series, parallel, or some combination of the above, and can handle enough power. I have a homemade dummy load that consists of three 2W 150 ohm resistors soldered to the body of a PL-259 at the near end, and connected to a short piece of insulated wire at the far end. That's an old connector designed for crimping onto RG-58, but the same concept will work with a standard size PL-259. I bought the resistors a while back at a store that carries repair parts for TV repair shops.

You can also use a larger number of lower wattage resistors mounted on perfboard. One possible configuration would be 20 1/4W or 1/2W 1K resistors connected in parallel. There would be a fair amount of soldering to do for that configuration but the build would otherwise be straightforward.

For a QRPp load you could use a smaller number of resistors in various connections. Two 100 ohm resistors make a simple arrangement. Higher power arrangements would include 5 10 ohm resistors in series, and eight 100 ohm resistors in a series-parallel arrangement. (Four parallel strings of two 100 ohm resistors in series.)

Any of these ideas should produce a dummy load that is adequate for the HF bands, and can be built entirely out of parts that many hams will have in their parts collections. If you want one with good VHF performance it's probably better to stick with one of the kit designs.



On Fri, Nov 8, 2019 at 2:12 PM Mark K0ABD via Groups.Io <mboston72=yahoo.com@groups.io> wrote:
OK, Marty, thanks.

Re: #qcx Firmware version 1.02 release #qcx

Tom N9GVP
 

I find that the sidetone issue in T102a occurs when the keyer menu is set for straight key, but the issue does not occur not when set for an iambic paddle.  That's kind of curious.

Re: 4 line LCD for the clock kit #clock

Eric KE6US
 

I double checked it. I was a little concerned that the photo displays "I2C LCD" on the second line, but someone in the Questions section answered that it is indeed a parallel LCD, not a serial one.

So yea, that's what you want.

As I and others mentioned, if you end up with a serial one, it's no big deal to remove it. The serial converter is just a little add-on board to the basic parallel LCD.

If you have any problems, holler. Someone here can help. I don't actually have the clock kit, but I've used  the same LCD in lots of homebrew ham and Arduino projects. Happy to help if needed.

Eric KE6US

On 11/8/2019 6:25 PM, Greg Walters via Groups.Io wrote:
Eric, if that second link you sent is the correct one, I'll just grab one or two of those. 
--
73,
Greg
KY4GW

Re: 4 line LCD for the clock kit #clock

Greg Walters
 

Eric, if that second link you sent is the correct one, I'll just grab one or two of those. 
--
73,
Greg
KY4GW

Re: 4 line LCD for the clock kit #clock

Greg Walters
 

Thank you both!

--
73,
Greg
KY4GW

Re: 20 Watt QRPLabs Dummy Load for Sale?

Gary Bernard
 

Mark,did you look at QRP guys dummy load. It handles 20 watts,small,BNC connector and easy to build. Also cheap.
Gary W0CKI


On Nov 8, 2019, at 4:46 PM, geoff M0ORE via Groups.Io <m0ore@...> wrote:



I am amazed that anyone would even consider using  PL259 / SO239 connectors for 1GHz.

On 08/11/2019 19:40, Mark K0ABD via Groups.Io wrote:

I'd rather not take any chances in destroying this new rig. I think I'll wait until I get a dummy load before turning it on.

What about this?

Mcbazel Surecom Male PL259 Plug DC to 1.0GHz 25W Watt 50 Ohm Dummy Load

Or this?

Mcbazel Surecom PL259 Male Plug DC to 1.0GHz 15W Watt 50 Ohm Dummy Load

According to the reviews it can be used for HAM antenna setups.

Then, I would just need a male BNC to female SO239?

thanks,
Mark/K0ABD

Re: 20 Watt QRPLabs Dummy Load for Sale?

geoff M0ORE
 

I am amazed that anyone would even consider using  PL259 / SO239 connectors for 1GHz.

On 08/11/2019 19:40, Mark K0ABD via Groups.Io wrote:

I'd rather not take any chances in destroying this new rig. I think I'll wait until I get a dummy load before turning it on.

What about this?

Mcbazel Surecom Male PL259 Plug DC to 1.0GHz 25W Watt 50 Ohm Dummy Load

Or this?

Mcbazel Surecom PL259 Male Plug DC to 1.0GHz 15W Watt 50 Ohm Dummy Load

According to the reviews it can be used for HAM antenna setups.

Then, I would just need a male BNC to female SO239?

thanks,
Mark/K0ABD

Re: 20 Watt QRPLabs Dummy Load for Sale?

geoff M0ORE
 

Be careful when choosing the resistors for a dummy load. Some can be inductive due to the method of construction. The very old fashioned carbon are most likely to be best. Cost is not an indication of the suitability for a dummy load.


On 08/11/2019 23:15, Shirley Dulcey KE1L wrote:
Even without a kit, most home builders can assemble a do-it-yourself dummy load.

The essential ingredient is a collection of ordinary carbon composition or carbon film resistors that add up to 50 ohms in series, parallel, or some combination of the above, and can handle enough power. I have a homemade dummy load that consists of three 2W 150 ohm resistors soldered to the body of a PL-259 at the near end, and connected to a short piece of insulated wire at the far end. That's an old connector designed for crimping onto RG-58, but the same concept will work with a standard size PL-259. I bought the resistors a while back at a store that carries repair parts for TV repair shops.

You can also use a larger number of lower wattage resistors mounted on perfboard. One possible configuration would be 20 1/4W or 1/2W 1K resistors connected in parallel. There would be a fair amount of soldering to do for that configuration but the build would otherwise be straightforward.

For a QRPp load you could use a smaller number of resistors in various connections. Two 100 ohm resistors make a simple arrangement. Higher power arrangements would include 5 10 ohm resistors in series, and eight 100 ohm resistors in a series-parallel arrangement. (Four parallel strings of two 100 ohm resistors in series.)

Any of these ideas should produce a dummy load that is adequate for the HF bands, and can be built entirely out of parts that many hams will have in their parts collections. If you want one with good VHF performance it's probably better to stick with one of the kit designs.



On Fri, Nov 8, 2019 at 2:12 PM Mark K0ABD via Groups.Io <mboston72=yahoo.com@groups.io> wrote:
OK, Marty, thanks.

Re: 20 Watt QRPLabs Dummy Load for Sale?

Mark K0ABD
 

Chopper,

Thanks for the suggestion as well as the direct link to the product that I just purchased.

Mark/KOABD

Re: 20 Watt QRPLabs Dummy Load for Sale?

Mark K0ABD
 

Bill,

I appreciate this tip that will prolong the life of my rig! I just ordered that on Amazon.

Mark/K0ABD