开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. QRPLabs
  2. Messages
Expanded Topics Messages Polls
Date
Re: QRV 80 meters

"g3vyz"
 

--- In QRPLabs@..., "g3vyz" <Les@...> wrote:


Today I got a 1.5 to 5pF ceramic trimmer for C9 instead of the
supplied 25pF, now I can tune up to just above 7000.900KHz and
setting the TX frequency between 800 to 900 is reasonably easy.
I'm not doing very well today :-( that should say 3500.900KHz not
7MHz.

My latest 7MHz MEPT is under construction now to be followed by
one for 30m in the next day or so.

During off and on air testing over the past 24 hours I've been
pleasantly surprised at how stable the transmit frequency has been.

Les G3VYZ
Re: QRV 80 meters

"g3vyz"
 

--- In QRPLabs@..., "g3vyz" <Les@...> wrote:

--- In QRPLabs@..., "Ken Evans" <w4du@> wrote:

I finished the 80 meter beacon last weekend and had a few problems. I first
destroyed a few 2N7000s by turning R8 fully counter clockwise instead of
clockwise - read the directions!!

Then I could not get the oscillator above 3500.540. I changed turns on L1
several times and finally ended shorting it but could not get above 3500.60.
I then changed C9 from a 5 - 25 pf to a 3 to 16 pf. Now I can go up to
3500.860. I think the issue is a finicky xtal.

Let me know when you "see me". I currently have my 70 mw beacon on 3500.850
(as close to mid band as I can adjust)
Hi Ken

I built an 80m kit today and had the same problem with the oscillator
being too low. The only trimmer caps I had to hand wouldn't go low
enough so I used a "gimmick" cap same as the coupling to the LED and
have managed to get the frequency up to around 850.

I was able to get 100mW output but when switching off the TX and on
again the oscillator wouldn't start until I backed off R6, this gave
me an output of 70mW and a reliable start up, (I'm powering mine from
a 4.8V supply).

I had a problem with these low profile xtals when trying to make up
a 30m TX (not a QRPLabs one) only in that case the frequency was way
too high and wouldn't pull down.

I wonder how the other folk have got on with their 80M kits, your
post is the only one I've seen about the problem we've both had.
That should have been R8 not R6 :-(

Today I got a 1.5 to 5pF ceramic trimmer for C9 instead of the
supplied 25pF, now I can tune up to just above 7000.900KHz and
setting the TX frequency between 800 to 900 is reasonably easy.

Les G3VYZ
New 30 meter QRSS

"ken evans"
 

开云体育

A friend, W3HZZ is now on 10.140.38 from Atlanta…..?? Please let us know if spotted
Re: QRV 80 meters

"g3vyz"
 

--- In QRPLabs@..., "Ken Evans" <w4du@...> wrote:

I finished the 80 meter beacon last weekend and had a few problems. I first
destroyed a few 2N7000s by turning R8 fully counter clockwise instead of
clockwise - read the directions!!

Then I could not get the oscillator above 3500.540. I changed turns on L1
several times and finally ended shorting it but could not get above 3500.60.
I then changed C9 from a 5 - 25 pf to a 3 to 16 pf. Now I can go up to
3500.860. I think the issue is a finicky xtal.

Let me know when you "see me". I currently have my 70 mw beacon on 3500.850
(as close to mid band as I can adjust)
Hi Ken

I built an 80m kit today and had the same problem with the oscillator
being too low. The only trimmer caps I had to hand wouldn't go low
enough so I used a "gimmick" cap same as the coupling to the LED and
have managed to get the frequency up to around 850.

I was able to get 100mW output but when switching off the TX and on
again the oscillator wouldn't start until I backed off R6, this gave
me an output of 70mW and a reliable start up, (I'm powering mine from
a 4.8V supply).

I had a problem with these low profile xtals when trying to make up
a 30m TX (not a QRPLabs one) only in that case the frequency was way
too high and wouldn't pull down.

I wonder how the other folk have got on with their 80M kits, your
post is the only one I've seen about the problem we've both had.

73 Les G3VYZ
Beacon kits are available again

Stephen Farthing
 

Hi Guys,

The G0UPL beacon kits are available again. Please order them via the ??on Hans's website. Please do not forget to tell us the callsign you want programmed into the keyer chip when you order.?

72/3 de Steve G0XAR

--
It is vain to do with more that which can be done with less.
80 meters

"Ken Evans"
 

There has been a bit of chatter about 80 meters. So, I am tonight, I am on
3500.828 at 70 mW.
Are there any 80 meter grabbers? What is the url?

Ken Evans, W4DU
QRP ARCI 696, GQRP 5918, FP 295, NOGA, ARRL Life
Re: QRSS Receiver completed and connected to grabber

"Paul Daulton"
 

Re: QRSS Receiver completed and connected to grabber

"Newton White"
 

开云体育

Arv,
?
I visited your page to read up on the receiver.? I am a novice when it comes to theory and such, so it is helpful to read your notes in detail. You mention the use of FT36-43 toroids as cores did not work. Did your idea for the 455 KHz IF transformers work for your receiver or did you find another method?
?
Newt
72,
k0nwt
?

----- Original Message -----
From: Arv Evans
Sent: Wednesday, December 22, 2010 16:06
Subject: [QRPLabs] QRSS Receiver completed and connected to grabber

?

Hello

A new QRSS receiver and new QRSS grabber are now on-line.

Details of the receiver are available here

??? ???

and the grabber output is here

??? ???

QRSS Receiver completed and connected to grabber

Arv Evans
 

开云体育

Hello

A new QRSS receiver and new QRSS grabber are now on-line.

Details of the receiver are available here

??? ???

and the grabber output is here

??? ???

With all the new QRP-Labs QRSS transmitters being activated, we need more
QRSS receiver/grabber servers to monitor them.? This is my contribution toward
that effort.

Arv K7HKL
_._
Beacon kit availability/missing parts/missing parcels/other bands/RXkits

Stephen Farthing
 

Hi guys,

First of all may i apologise to those of you who have found a couple of parts missing in recent kits. I have a very small brain and sometimes I loose count when I get distracted. If you do find a part missing please let me know and I'll ship you a replacement ASAP.?

Secondly a couple of kits have gone missing in the post recently and one took some months to arrive instead of the normal 10 days to the land of the brave and the free, where nothing is heard but the sound of a bird and the sky is not cloudy all day etc. I'll be taking this up with the Post office guy when the Christmas rush is over. If you have a missing kit please contact me and I'll sort it out.?

Lastly, I just got back from a trip to Budapest a day late and to the wrong airport. Continental Europe is snowed in most of the flights from Budapest to The Netherlands and Germany were cancelled so i was lucky to get home. The good news is that waiting for me were 100 PCBs and 200 T37/43s from Diz (AKA The Toroid King). So I will be packing another 100 kits over the next few days and re-stocking the shop. This will the last batch for the?foreseeable?future. Hans and I will be shutting the shop during February as we both have significant family/work commitments. Normal service will be resumed in March.

A couple of people have asked us about other bands...20 meters, 10 meters and VLF. Neither Hans or I have the time to do any significant work on these at the moment. When we started the beacon kits we had hoped that people would use them as a starting point for their own?experimentation. If anyone fancies a go at 20/10 meters (or any other band) I am happy to donate some crystals and other parts on the promise that you write the results up and post them to the QRP Labs group. I don't have any crystals for VLF. Please contact Hans or I off list...

Lastly, the RX kits are delayed for a few months...entirely due to lack of time and me starting a new career at short notice.. They will happen, apart from anything else we have most of the parts and the PCB's for the first run which is a significant investment.?


72/3 de Steve G0XAR



--
It is vain to do with more that which can be done with less.
Re: WSPR

"Philip"
 

Thanks for the information guys
Very useful...

Regards
Philip

--- In QRPLabs@..., "Yannick" <yannick.devos@...> wrote:

Hi Hans, Philip, fellow QRSS knights,

OE1FM has designed and built stand alone beacons that are running in Africa (V53ARC that I seldom receive).
Design is a bit complex but perhaps some idea could inspire a new work.



73,
Yan - XV4TUJ.
---
Yannick DEVOS - XV4TUJ
(Blog in french)
(web page in english)

--- In QRPLabs@..., "hanssummers2000" <hans.summers@> wrote:


Hi Philip

Out of interest, could one of these TX boards be used/modified
for use as a WSPR transmitter?
It could, but not easily!

Well, depends how you look at it. If you just look at the board as a plain 30m transmitter, and then decide to interface it to your PC, and have the PC generate the WSPR code and control the transmitter, then I think that's a relatively straightforward proposition.

On the other hand, perhaps the more interesting approach is to consider a WSPR transmitter that is standalone, not requiring a PC to control it. This is one of the things I'd like to look at in future when I have time. Changes that would need to be made, off the top of my head, would include:

1) Shift the frequency up 100Hz (just a matter of adjustment)

2) Arrange for the PA to be keyed, rather than just permanently on. This would need reprogramming of the microcontroller, such that one of the pins (probably one of the pins currently used for setting the QRSS speed) could control the PA. The PA should be switched on for the required 2 minute WSPR transmission frame then switched off for the rest of the 10 minute WSPR cycle.

3) Program the microcontroller to send WSPR. Seemingly the most likely way to accomplish this is to use the DOS program that's out there somewhere on the internet, which will take a set of parameters (i.e. your locator, transmitter power) and output a sequence of codes to control the transmitter frequency. There are four frequency steps in a WSPR message so it would like like 1, 0, 3, 2, 0, 1, 3, etc etc. (i.e. a sequency of 0's, 1's, 2's and 3's).

4) Modify the circuit slightly to allow the four frequencies rather than just 2-level FSK. This can be done using a PWM output from the micro and an integrator resistor/capacitor network between the microcontroller pin and the frequency tuning varactor diode (a.k.a. the 5mm red LED).

5) Seemingly the biggest challenge is the issue of timing. The keyer currently just runs on the microcontroller's internal RC oscillator, which would not be accurate enough for WSPR purposes. It would be necessary to use a crystal for the frequency control, at a minimum.

It would also be necessary to synchronise the circuit operation to the standard 10 minute WSPR cycle, the minute starts have to be synchronous to world time, to a fair accuracy. I think that a properly adjusted crystal oscillator would probably be accurate enough to allow 24 hours of WSPR operation, and perhaps add a button to allow synchronisation once every 24 hours with the actual time. I think the deviation would be within limits.

The alternative is much more complex, if you had a GPS receiver module for example, then that could be used to extract precise timing and synchronisation.

73 de Hans G0UPL
Re: WSPR

"Yannick"
 

Hi Hans, Philip, fellow QRSS knights,

OE1FM has designed and built stand alone beacons that are running in Africa (V53ARC that I seldom receive).
Design is a bit complex but perhaps some idea could inspire a new work.



73,
Yan - XV4TUJ.
---
Yannick DEVOS - XV4TUJ
(Blog in french)
(web page in english)

--- In QRPLabs@..., "hanssummers2000" <hans.summers@...> wrote:


Hi Philip

Out of interest, could one of these TX boards be used/modified
for use as a WSPR transmitter?
It could, but not easily!

Well, depends how you look at it. If you just look at the board as a plain 30m transmitter, and then decide to interface it to your PC, and have the PC generate the WSPR code and control the transmitter, then I think that's a relatively straightforward proposition.

On the other hand, perhaps the more interesting approach is to consider a WSPR transmitter that is standalone, not requiring a PC to control it. This is one of the things I'd like to look at in future when I have time. Changes that would need to be made, off the top of my head, would include:

1) Shift the frequency up 100Hz (just a matter of adjustment)

2) Arrange for the PA to be keyed, rather than just permanently on. This would need reprogramming of the microcontroller, such that one of the pins (probably one of the pins currently used for setting the QRSS speed) could control the PA. The PA should be switched on for the required 2 minute WSPR transmission frame then switched off for the rest of the 10 minute WSPR cycle.

3) Program the microcontroller to send WSPR. Seemingly the most likely way to accomplish this is to use the DOS program that's out there somewhere on the internet, which will take a set of parameters (i.e. your locator, transmitter power) and output a sequence of codes to control the transmitter frequency. There are four frequency steps in a WSPR message so it would like like 1, 0, 3, 2, 0, 1, 3, etc etc. (i.e. a sequency of 0's, 1's, 2's and 3's).

4) Modify the circuit slightly to allow the four frequencies rather than just 2-level FSK. This can be done using a PWM output from the micro and an integrator resistor/capacitor network between the microcontroller pin and the frequency tuning varactor diode (a.k.a. the 5mm red LED).

5) Seemingly the biggest challenge is the issue of timing. The keyer currently just runs on the microcontroller's internal RC oscillator, which would not be accurate enough for WSPR purposes. It would be necessary to use a crystal for the frequency control, at a minimum.

It would also be necessary to synchronise the circuit operation to the standard 10 minute WSPR cycle, the minute starts have to be synchronous to world time, to a fair accuracy. I think that a properly adjusted crystal oscillator would probably be accurate enough to allow 24 hours of WSPR operation, and perhaps add a button to allow synchronisation once every 24 hours with the actual time. I think the deviation would be within limits.

The alternative is much more complex, if you had a GPS receiver module for example, then that could be used to extract precise timing and synchronisation.

73 de Hans G0UPL
Re: WSPR

"hanssummers2000"
 

Hi Philip

Out of interest, could one of these TX boards be used/modified
for use as a WSPR transmitter?
It could, but not easily!

Well, depends how you look at it. If you just look at the board as a plain 30m transmitter, and then decide to interface it to your PC, and have the PC generate the WSPR code and control the transmitter, then I think that's a relatively straightforward proposition.

On the other hand, perhaps the more interesting approach is to consider a WSPR transmitter that is standalone, not requiring a PC to control it. This is one of the things I'd like to look at in future when I have time. Changes that would need to be made, off the top of my head, would include:

1) Shift the frequency up 100Hz (just a matter of adjustment)

2) Arrange for the PA to be keyed, rather than just permanently on. This would need reprogramming of the microcontroller, such that one of the pins (probably one of the pins currently used for setting the QRSS speed) could control the PA. The PA should be switched on for the required 2 minute WSPR transmission frame then switched off for the rest of the 10 minute WSPR cycle.

3) Program the microcontroller to send WSPR. Seemingly the most likely way to accomplish this is to use the DOS program that's out there somewhere on the internet, which will take a set of parameters (i.e. your locator, transmitter power) and output a sequence of codes to control the transmitter frequency. There are four frequency steps in a WSPR message so it would like like 1, 0, 3, 2, 0, 1, 3, etc etc. (i.e. a sequency of 0's, 1's, 2's and 3's).

4) Modify the circuit slightly to allow the four frequencies rather than just 2-level FSK. This can be done using a PWM output from the micro and an integrator resistor/capacitor network between the microcontroller pin and the frequency tuning varactor diode (a.k.a. the 5mm red LED).

5) Seemingly the biggest challenge is the issue of timing. The keyer currently just runs on the microcontroller's internal RC oscillator, which would not be accurate enough for WSPR purposes. It would be necessary to use a crystal for the frequency control, at a minimum.

It would also be necessary to synchronise the circuit operation to the standard 10 minute WSPR cycle, the minute starts have to be synchronous to world time, to a fair accuracy. I think that a properly adjusted crystal oscillator would probably be accurate enough to allow 24 hours of WSPR operation, and perhaps add a button to allow synchronisation once every 24 hours with the actual time. I think the deviation would be within limits.

The alternative is much more complex, if you had a GPS receiver module for example, then that could be used to extract precise timing and synchronisation.

73 de Hans G0UPL
WSPR

"Philip"
 

Out of interest, could one of these TX boards be used/modified for use as a WSPR transmitter?


Regards
Philip
QRSS back on the air

"rastk2"
 

Greetings to all

The HS0ZHB QRSS beacon experiment went quire well. Unfortunately technical difficulties and illness has keep me from getting its counterpart on the air.

As of today HS0ZHB has been resurrected as NM7J located in Las Vegas, NV.
Using a coaxial bazooka inverted V at APPROX. 35 feet.
Final settings are 80mw and everything is working so far.
Any feedback would be appreciated.

73 de
Stephen
NM7J
Re: Useful links....

"Philip"
 

Yummy!

Thanks for posting that information Steve...
Very useful indeed :)

--- In QRPLabs@..., Stephen Farthing <squirrox@...> wrote:

Hi Guys....

These might be of interest :-

Details of an AVR programmer for USB which you can use to reprogram the
ATTiny 13 keyers we provide with the beacon kits -


Details of a simple and accurate DIY Power meter


73s Steve G0XAR



--
It is vain to do with more that which can be done with less.
Useful links....

Stephen Farthing
 

Hi Guys....

These might be of interest :-

Details of an AVR programmer for USB which you can use to reprogram the ATTiny 13 keyers we provide with the beacon kits -?

Details of a simple and accurate DIY Power meter?

73s Steve G0XAR



--
It is vain to do with more that which can be done with less.
30m beacon now operational

timrob@...
 

Guys

I have activated my 30m beacon at QG62ll. Unknown power but I assume close to 100mW into a 30m dipole. The feed is approx 10m above the ground and the arms are horizontal, one EW and the other NS. On a sloping block so the ends are higher than the feed. Frequency is 10140035, but has varied a little during the day, up to 10140045.

I have it running 24/7 until the batteries fail, when I'll replace them.

Thanks

Tim
VK4YEH
FW: 80 meters

"Ken Evans"
 

Posted this two days and got one spot from W4HBK.... Will leave up until
1200Z Dec 7. Please let me know if you spot me.

Ken Evans, W4DU
QRP ARCI 696, GQRP 5918, FP 295, NOGA, ARRL Life

-----Original Message-----
From: Ken Evans [mailto:w4du@...]
Sent: Saturday, December 04, 2010 18:37
To: KnightsQRSS (knightsqrss@...); QRPLabs@...
Subject: 80 meters

My 80 meter QRSS beacon is up on 3500.840 as of 2300 UTC 12/4/2010. I will
keep it on throughout tonight until past gray line. It will go back up on
12/5/2010 at 2200 UTC and stay though 1300 UTC on 12/06. Spots are
appreciated.

BTW, am running 70 mw to an 80 meter inverted Vee at 50 feet.

Ken Evans, W4DU
QRP ARCI 696, GQRP 5918, FP 295, NOGA, ARRL Life
G0UPL Beacon kit availability

Stephen Farthing
 

Greetings one and all,

I am afraid we are out of stock of beacon kits and a few other items for a couple of weeks until fresh stocks of toroids, crystals and PCBs arrive. I'll post here when we have more stock.

Please do NOT send me money in anticipation of a kit. To keep things easy to manage all orders must go via the shop on Hans's web site.?

Thanks,

Steve G0XAR

--
It is vain to do with more that which can be done with less.
140481 - 140500 of 140693