Date   
Re: The Light APRS Reciever

Gregor DL9MEU
 

Hi Mustafa,

Yes, I do understand, that with the existing Light APRS, RX is not possible. For RX, additional hardware will be necessary. What I am dreaming/hoping is a third member of the Light APRS Family lets call it Light APRS-h with TRX on board and I2C.

We will have a video payload modul which will be completely separate and independent working on 433 MHz, while APRS is on 144 MHz. We will use a LORA (only TX!) for the transmission for pictures. For the picture transmission we will use the WENET system from our friends in VK , Project Horus.

Also from the handling on groundstation there must be a clear separation for the two functions+teams “Navigation”+”Video”. If I understand correct, Joe WB9SBD, is looking for more or less the same.

https://github.com/hallard/LoRasPI

https://github.com/projecthorus/wenet

 

73 Greg, DL9MEU

Re: The Light APRS Reciever

Joe WB9SBD
 

Did that found a WIKI, and i don't see anything about a 2 meter receiver.

Joe WB9SBD

On 4/3/2020 1:18 PM, Arv Evans wrote:
It is explained on a Wiki.  Google it.




On Fri, Apr 3, 2020, 11:28 AM Joe WB9SBD <nss@...> wrote:
Hello,

Our group is also very interested in receiving capabilities.

What is this "LORA"

Joe WB9SBD


On 4/3/2020 9:23 AM, Mustafa Tan wrote:
Hi Gregor,

Dorji DRA818V's RX module is problematic. There are a lot of issues to resolve. To resolve these issues we have to use extra components. That's the main reason we didn't enable it.

So you have 2 options:

1) To connect another RF module with RX capability (such as LORA) via I2C pins.

2) Reading sensors (altitude, pressure, location, etc.) and trigger commands if conditions met.

TA2MUN


On Fri, Apr 3, 2020 at 4:05 PM Gregor DL9MEU <dl9meu@...> wrote:

We, as a local group of HAMs are just starting with a HAB project together with some students of the local school. Geofence would be a useful feature for us, thank you for that offer.

We can see world wide a quite big number of similar projects related to education. Nearly all these projects are HAB because of more educational possibilities.

Light APRS has unique features, the I2C bus and is open source. A lot of experiments demand a kind of control from the control station. In our case to separate the balloon, others to release a small model plane or start / stop other experiments. The Dorji TX/RX has already implemented CTCSS / CDCSS. The weight of the TRX for this kind of balloons is not as critical as for pico balloons, the same goes for the power supply. It would be great for all educational groups if there would be an specific HAB Light APRS.
At the moment, we have a Corona lockdown, I not even can reach my Light APRS, it is in the club station… But may be we can use the time to find out, if there will be more demand for a RX/TX HAB Light APRS and what specification needed. Maybe there will be a chance for a new member of the Light APRS Family.

Stay home, Stay healthy
73 de Greg, DL9MEU



--


Re: The Light APRS Reciever

Arv Evans
 

It is explained on a Wiki.  Google it.




On Fri, Apr 3, 2020, 11:28 AM Joe WB9SBD <nss@...> wrote:
Hello,

Our group is also very interested in receiving capabilities.

What is this "LORA"

Joe WB9SBD


On 4/3/2020 9:23 AM, Mustafa Tan wrote:
Hi Gregor,

Dorji DRA818V's RX module is problematic. There are a lot of issues to resolve. To resolve these issues we have to use extra components. That's the main reason we didn't enable it.

So you have 2 options:

1) To connect another RF module with RX capability (such as LORA) via I2C pins.

2) Reading sensors (altitude, pressure, location, etc.) and trigger commands if conditions met.

TA2MUN


On Fri, Apr 3, 2020 at 4:05 PM Gregor DL9MEU <dl9meu@...> wrote:

We, as a local group of HAMs are just starting with a HAB project together with some students of the local school. Geofence would be a useful feature for us, thank you for that offer.

We can see world wide a quite big number of similar projects related to education. Nearly all these projects are HAB because of more educational possibilities.

Light APRS has unique features, the I2C bus and is open source. A lot of experiments demand a kind of control from the control station. In our case to separate the balloon, others to release a small model plane or start / stop other experiments. The Dorji TX/RX has already implemented CTCSS / CDCSS. The weight of the TRX for this kind of balloons is not as critical as for pico balloons, the same goes for the power supply. It would be great for all educational groups if there would be an specific HAB Light APRS.
At the moment, we have a Corona lockdown, I not even can reach my Light APRS, it is in the club station… But may be we can use the time to find out, if there will be more demand for a RX/TX HAB Light APRS and what specification needed. Maybe there will be a chance for a new member of the Light APRS Family.

Stay home, Stay healthy
73 de Greg, DL9MEU



--

Re: Pre-wound Toroids

Richard Lawn
 

Thanks guys. I’ve used him before with other kits. 

73
Rick, W2JAZ 

On Fri, Apr 3, 2020 at 1:29 PM Michael N6MST <mthompson.cob@...> wrote:
Mychael AA3WF does exactly this. He is the go-to guy for pre-wound toroids. He will wind to your specs for a fee and he does very good work. You can email him at toroidguy@...

--

Re: Pre-wound Toroids

Michael N6MST
 

Mychael AA3WF does exactly this. He is the go-to guy for pre-wound toroids. He will wind to your specs for a fee and he does very good work. You can email him at toroidguy@...

Re: Pre-wound Toroids

Eric KE6US
 

You might try AA3WF. He makes high quality toroids for the Elecraft K2, but I don't know if he will do others. Can't hurt to try. His email is included on the page linked below.

https://elecraft.com/pages/pre-wound-toroids

Eric KE6US

On 4/3/2020 8:59 AM, Richard Lawn wrote:
I just reached that point in the kit where I expected I might have trouble because of my age and hand coordination. Old age is a terrible thing but unavoidable. 

I just wonder if there is anyone who sells these toroids prewound for the QSX. L2-4 aren't too bad but L1 intimidates me given how difficult it was for me to wind the first L4. It would be a great service I'd be happy to spend a reasonable amount of money for. 

73
Rick, W2JAZ

Re: The Light APRS Reciever

Joe WB9SBD
 

Hello,

Our group is also very interested in receiving capabilities.

What is this "LORA"

Joe WB9SBD


On 4/3/2020 9:23 AM, Mustafa Tan wrote:
Hi Gregor,

Dorji DRA818V's RX module is problematic. There are a lot of issues to resolve. To resolve these issues we have to use extra components. That's the main reason we didn't enable it.

So you have 2 options:

1) To connect another RF module with RX capability (such as LORA) via I2C pins.

2) Reading sensors (altitude, pressure, location, etc.) and trigger commands if conditions met.

TA2MUN


On Fri, Apr 3, 2020 at 4:05 PM Gregor DL9MEU <dl9meu@...> wrote:

We, as a local group of HAMs are just starting with a HAB project together with some students of the local school. Geofence would be a useful feature for us, thank you for that offer.

We can see world wide a quite big number of similar projects related to education. Nearly all these projects are HAB because of more educational possibilities.

Light APRS has unique features, the I2C bus and is open source. A lot of experiments demand a kind of control from the control station. In our case to separate the balloon, others to release a small model plane or start / stop other experiments. The Dorji TX/RX has already implemented CTCSS / CDCSS. The weight of the TRX for this kind of balloons is not as critical as for pico balloons, the same goes for the power supply. It would be great for all educational groups if there would be an specific HAB Light APRS.
At the moment, we have a Corona lockdown, I not even can reach my Light APRS, it is in the club station… But may be we can use the time to find out, if there will be more demand for a RX/TX HAB Light APRS and what specification needed. Maybe there will be a chance for a new member of the Light APRS Family.

Stay home, Stay healthy
73 de Greg, DL9MEU



--

SVHFS Conference Cancellation Information

Robin Midgett
 

After discussion between the SVHFS Board of Directors and the 2020 Conference Committee, it was decided that the 2020 conference will be canceled and not rescheduled this year. The next SVHFS conference will be scheduled for April of 2021 at an unknown venue at this time. All registration fees for 2020 will be returned in full. Please cancel any Hotel reservations you may have made.

Additional information is available regarding conference, hotel refunds and proceedings. Access the Conference Page for the latest information.

Thanks,
SVHFS Board of Directors

Re: Question regarding measuring power output.

Andy V. Borisenko
 

yes, in this case I agree with you.
then there is an easier way. built-in power meter.
I compared his readings with a device from the R&S FSH3 at a supply voltage of 11 to 16 volts. indications are quite correct and are included in no more than 15% error.

Pre-wound Toroids

Richard Lawn
 

I just reached that point in the kit where I expected I might have trouble because of my age and hand coordination. Old age is a terrible thing but unavoidable. 

I just wonder if there is anyone who sells these toroids prewound for the QSX. L2-4 aren't too bad but L1 intimidates me given how difficult it was for me to wind the first L4. It would be a great service I'd be happy to spend a reasonable amount of money for. 

73
Rick, W2JAZ

Re: QCX 40 No Sidetone and output is raspy

Alan G4ZFQ
 

Did you change the tone from the default setting?  If so change back to the default tone it should clear up the issue. There is a discussion here about that.  If I recall it was just after 1.3 was released.
This is earlier, https://groups.io/g/QRPLabs/message/39812?p=,,,20,0,0,0::Created,,default+sidetone+frequency,20,2,0,44099475 but it seems you've got a good memory!
Further searches might reveal if there was any update, or a look at the firmware changelog.

73 Alan G4ZFQ

Re: QCX 40 No Sidetone and output is raspy

N3MNT
 

Did you change the tone from the default setting?  If so change back to the default tone it should clear up the issue. There is a discussion here about that.  If I recall it was just after 1.3 was released.

Re: #20m QCX #20m

steve Jones
 

Hi James, 
                 thank you for replying to my query.

Well I decided that it would be good to confirm whether there was an issue with T1 secondary windings in respect of them being either O/C or H/R. So I removed each leg that feeds pins 7 and 9 of IC4, this revealed that the centre tap connected at the junction was 2.5V when power was applied.

T1 secondary is OK.

C1 is OK and not S/C, so I must assume that IC4 is at fault when connected to T1 secondary via pins 7 and 9 and that maybe the method by which it appears to have failed is the reason for it dragging down the 2.5V derived at the junction of R1 and R2, hence  this potential cannot propagate through to bias IC5 tending toward IC8.

On inspection the pins on IC4 look OK in terms of soldering and being free of any S/Cs.

Maybe the next stage is to perform surgery and remove the current IC4 with a new one - fortunately I have one in stock.

Thanks again, I hope you are keeping well and safe at this difficult time.

Steve

Re: QCX 40 No Sidetone and output is raspy

 

Very possible. Nothing is where it would normally be because I'm testing. There's a rats nest of power and RF cables. The QCX is working as it should. I'll test the whole setup this evening but clean it up first. 
--
73
NE5U

Mike

Re: The Light APRS Reciever

Mustafa Tan
 

Hi Gregor,

Dorji DRA818V's RX module is problematic. There are a lot of issues to resolve. To resolve these issues we have to use extra components. That's the main reason we didn't enable it.

So you have 2 options:

1) To connect another RF module with RX capability (such as LORA) via I2C pins.

2) Reading sensors (altitude, pressure, location, etc.) and trigger commands if conditions met.

TA2MUN


On Fri, Apr 3, 2020 at 4:05 PM Gregor DL9MEU <dl9meu@...> wrote:

We, as a local group of HAMs are just starting with a HAB project together with some students of the local school. Geofence would be a useful feature for us, thank you for that offer.

We can see world wide a quite big number of similar projects related to education. Nearly all these projects are HAB because of more educational possibilities.

Light APRS has unique features, the I2C bus and is open source. A lot of experiments demand a kind of control from the control station. In our case to separate the balloon, others to release a small model plane or start / stop other experiments. The Dorji TX/RX has already implemented CTCSS / CDCSS. The weight of the TRX for this kind of balloons is not as critical as for pico balloons, the same goes for the power supply. It would be great for all educational groups if there would be an specific HAB Light APRS.
At the moment, we have a Corona lockdown, I not even can reach my Light APRS, it is in the club station… But may be we can use the time to find out, if there will be more demand for a RX/TX HAB Light APRS and what specification needed. Maybe there will be a chance for a new member of the Light APRS Family.

Stay home, Stay healthy
73 de Greg, DL9MEU



Re: The Light APRS Reciever

Gregor DL9MEU
 

We, as a local group of HAMs are just starting with a HAB project together with some students of the local school. Geofence would be a useful feature for us, thank you for that offer.

We can see world wide a quite big number of similar projects related to education. Nearly all these projects are HAB because of more educational possibilities.

Light APRS has unique features, the I2C bus and is open source. A lot of experiments demand a kind of control from the control station. In our case to separate the balloon, others to release a small model plane or start / stop other experiments. The Dorji TX/RX has already implemented CTCSS / CDCSS. The weight of the TRX for this kind of balloons is not as critical as for pico balloons, the same goes for the power supply. It would be great for all educational groups if there would be an specific HAB Light APRS.
At the moment, we have a Corona lockdown, I not even can reach my Light APRS, it is in the club station… But may be we can use the time to find out, if there will be more demand for a RX/TX HAB Light APRS and what specification needed. Maybe there will be a chance for a new member of the Light APRS Family.

Stay home, Stay healthy
73 de Greg, DL9MEU

Re: VFO Signal Generator with incorrect fundamental and sinusoidal contamination #vfo

alan bohne
 

Thank you Hans
I am relieved that my observations are not purely a result of my minimal electronics expertise.  One of the reasons I enjoy kit building is that I learn a bit more via the construction, testing, and general “playing around with it” phases.....albeit it sometimes feels like a love/hate relationship.  While not yet out-of-the-woods with this kit, it does make me a bit less apprehensive re the upcoming QSX.
tnx, Alan, K1ARW

Re: Question regarding measuring power output.

Richard G4TGJ
 

On Fri, Apr 3, 2020 at 05:14 AM, Andy V. Borisenko wrote:
the easiest way at home is to roughly determine the power of the QCX by the method of current consumption by the transceiver.
This is a useless method because the whole point of measuring the power output is to know whether or not the circuit is working correctly. If the PA is not working efficiently or if the LPF is incorrectly aligned (a well known problem with the QCX) then measuring the current consumption tells you nothing.
 
--
73
Richard
G4TGJ

Re: #QCX40 Rev5 LCD contrast adjustment appears to cause massive current draw #qcx40

Alan G4ZFQ
 

Recent suggestions do not account for the fact that tuning the contrast pot to max shorts out the 5V line.
Therefore the pot slider must be grounded.
Maybe a solder splash, too much solder or even a rogue board with a tiny piece of unetched copper.
Or, any of the other suggestions that would result in the 5V line being shorted to ground.

73 Alan G4ZFQ

Re: #QCX40 Rev5 LCD contrast adjustment appears to cause massive current draw #qcx40

M0RON
 

Hi Paul,
looking at your photo of the led screen the last pin looks like a poor soldered joint, I believe that this pin, and the one next to it, are connected to the contrast adjustment resistor. 
Id reflow it using plenty of flux also the pin next to it. 
Good luck
andy
--
The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.