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Re: Nouveau 75 Errata
hamhog1
The photos from the photo page show just the opposite arrangement of the screws for the heat sink.
Gary K4VIG -- Gary K4VIG
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Upcoming Event: Wednesday Evening 40 and 80 meter Nets - Wed, 08/14/2019 8:00pm-9:00pm
#cal-reminder
main@4SQRP.groups.io Calendar <main@...>
Reminder: Wednesday Evening 40 and 80 meter Nets When: Wednesday, 14 August 2019, 8:00pm to 9:00pm, (GMT-05:00) America/Chicago Where:40 and 80 Meters Organizer: jomatlock@... Description: The 40 Meter Net will be at 8:00 pm DST central time on 7.122 +-. QRM
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Re: Exploring the 4SQRP Group "Member Map" tab
Ray Cadmus
Sorry, hadn't realized that it had been so long. I will look at getting you an updated location file. I will also look at possibility of triggering auto-update on new member add. Ray W9EUM --
On 8/14/19 11:44 AM, AG1P Ron wrote:
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Re: SSS Results for August
Carl Gansen
Congratulations to Nick. We had to work harder than usual to complete the MN to TX
QSO. Chas was strong on 40M and unheard on 20M here. The evening was frustrating fun. 72 Carl
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Re: Exploring the 4SQRP Group "Member Map" tab
AG1P Ron
GM Don, Sorry for the delay. Yesterday was long health-related visits day.
You are correct. The map is static. The program that generates the map needs a file with GPS information to generate the map . It was generated by someone several years ago. To add all the new members is a labor intensive task. I have higher priority tasks on my plate so have not looked into better solution or done the heads down work to get gps coordinates for each of the members to be added and update the file.
72 - Ron - AG1P 4SQRP Volunteer Webmaster
From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of W6BOW via Groups.Io
Dear All,
Exploring the 4SQRP Group (http://www.4sqrp.com/index.php) "Member Map" tab (http://www.4sqrp.com/Map.php) I find that this utility needs updating. (I can't find myself -W6BOW. Do I exist?) A "member's callsign lookup box" would be a great addition.
I'd be happy to sponsor or help to sponsor ($$$) an update and upgrade.
73,
Don - W6BOW San Francisco CA USA
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Re: Nouveau 75 Errata
nm0s_qrp <ai9e_qrp@...>
The manual is correct. I'll correct the schematic ASAP.
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Re: Nouveau 75 Errata
Regarding the observed Q11, Q10 heating, in normal operation these will exhibit no heating at all in the receive mode.
What I suspect has happened is that Q11 and Q12 had shorted together with power applied, and damaged some components on the board, resulting in the heating observed.
Notice that Q11 and Q12 are close together on the board. This is why the assembly instructions explicitly specify that the heat sink mounting screws are to be installed through the back of the heat sink, emerging through the tab of the transistor. This limits the opportunity for the two transistors to come in electrical contact.
So to reiterate, the hardware stackup should be screw, passing through flat washer, back of heat sink, black heat sink pad, back of transistor, lock washer, and nut.
The three legs on the heat sink should be snipped off.
Before soldering the transistor to the board, check the spacing between the heat sink and the board to make certain that the sink does not contact any of the surface mount components on the board. Readjust the sink on the transistor if necessary. Only then should you solder the transistor down.
Finally, be certain that there is no contact between Q11 and Q12 before power up.
That should prevent any of damage to components due to heat sink shorting.
73 Dave NM0S
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Re: Exploring the 4SQRP Group "Member Map" tab
Ray Cadmus
You are correct. I have not updated the map for some time. I'll see what I can do. Just in case someone else might like to undertake an update from time to time I will outline the process that I go through. There is also the option of simply adding to the location file on the site but that would require that it be made available for download or update. Anyway... 1 - pull the current fcc data base and place it in something like mysql 2 - parse the member list from the web site to get a simple list of call signs 3 - match that list against the gov db to get addresses 4 - run the address list thru the U-Tex geo site to get location data 5 - put the collected date into a form usable by the open street map Again, I'll see what I can do but I may be getting too old for this stuff :-) Regards, Ray W9EUM (former W0PFO) --
On 8/13/19 7:39 PM, W6BOW via Groups.Io
wrote:
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Re: Exploring the 4SQRP Group "Member Map" tab
John Lonigro
Good tip Jeff. The member list is alphabetized so you really don’t need to do a search at all, other than rapidly scrolling down the list and doing an old fashioned visual search.
toggle quoted messageShow quoted text
72, John, AA0VE
On Aug 14, 2019, at 6:03 AM, Jeff Logullo N0̸MII <jeff@...> wrote:
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Re: The Lightbulb QSO Party
Dick Hammond
Good reading Bruce. Dick, notgr
On Tue, Aug 13, 2019, 10:26 PM KK0S <bbarley48@...> wrote:
--
What a great improvement, Yahoo just didn't work for me. Dick, n0tgr
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Re: Exploring the 4SQRP Group "Member Map" tab
One exception to Jim's tip below: if you're trying to search for a "0" (numeric zero) your browser search will fail. You'll need to substitute an "O" (letter O) instead of searching for a zero. What looks like slashed zeros on the Member Map page is actually a Unicode "Latin Capital Letter O with Stroke." So a search for zeros will fail.
toggle quoted messageShow quoted text
Jeff N0̸MII
--
Jeff N0̷MII
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Re: The Lightbulb QSO Party
All -
Take your ohm meter and measure the filament resistance at room temperature, with no power applied. Now, assuming you are using a standard incandescent light bulb (say somewhere around 50 to 100 watts), look what happens to the power consumed at the moment the bulb is first powered up and the power that is consumed after the filament heats up. P=E*E/R The wattage rating of a light bulb is measured at full rated voltage in steady state conditions. That means a 100 W bulb pulls quite a bit more than 100W at the instant it's turned on. You know how it seems that an incandescent light bulb always burns out when you flip the switch to turn it on. So, the result is that as you are keying your light bulb filament (dummy load), the actual load seen by your transmitter rapidly varies. It starts low and goes to a higher value with each dit and dah. The old tube rigs didn't much care – they were tough. But your output transistors are a bit more finicky in their diet. Oops! There goes that magic smoke again. But for QRPer's - not to worry too much. At 5 watts (figure your voltage into 50 ohms), a 50 to 100 watt light bulb probably won't undergo too much heating. If you have enough power to make the filament glow (even dimly), that load resistance is already on the way up. What it might do, though is contribute to a “yooupy” signal, if your rig is sensitive to a changing load. Remember how the changing load presented by a blowing wind on a wire antenna could affect the old single tube MOPA transmitters and regin receivers back in the days of yore? Oh, well... Enjoy! That's what ham radio is all about, anyway.
Bruce – KK0S
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Re: Exploring the 4SQRP Group "Member Map" tab
Jim Pruitt
Don if you go to the 4SQRP home page
toggle quoted messageShow quoted text
http://www.4sqrp.com/index.php and select "Member List" http://www.4sqrp.com/w25.php which is the item above "Member Map" that you mention. That List will brink up a frame with all the member's calls on it. Do a browser search (Control F for Firefox/Waterfox) and put in BOW [or W6BOW] it will go to W6BOW (the only Bow on the list). When you mouse over W6BOW a box pops out that says you are member 1830. Using the map shows where members are located, their call, and name but in many cases you have to enlarge the map a lot in order to separate members so you can pick one. It does not list membership number. The "Member List" page does give you that information though. Thank you. Jim Pruitt WA7DUY
On 8/13/2019 5:39 PM, W6BOW via
Groups.Io wrote:
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Upcoming Event: Wednesday Evening 40 and 80 meter Nets - Wed, 08/14/2019 8:00pm-9:00pm
#cal-reminder
main@4SQRP.groups.io Calendar <main@...>
Reminder: Wednesday Evening 40 and 80 meter Nets When: Wednesday, 14 August 2019, 8:00pm to 9:00pm, (GMT-05:00) America/Chicago Where:40 and 80 Meters Organizer: jomatlock@... Description: The 40 Meter Net will be at 8:00 pm DST central time on 7.122 +-. QRM
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Re: Exploring the 4SQRP Group "Member Map" tab
J.K. Wright
Your number is 1830. The call sign listing is in alpha/numeric order. Go toward the bottom of first column for W..... then across.....
On Tue, Aug 13, 2019, 8:39 PM W6BOW via Groups.Io <DBuckter=aol.com@groups.io> wrote:
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Exploring the 4SQRP Group "Member Map" tab
W6BOW
Dear All,
Exploring the 4SQRP Group (http://www.4sqrp.com/index.php) "Member Map" tab (http://www.4sqrp.com/Map.php) I find that this utility needs updating. (I can't find myself -W6BOW. Do I exist?)
A "member's callsign lookup box" would be a great addition.
I'd be happy to sponsor or help to sponsor ($$$) an update and upgrade.
73,
Don - W6BOW
San Francisco CA USA
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Re: The Lightbulb QSO Party
Nick Kennedy <kennnick@...>
I always figured that with the light bulb thing, most of the radiation would be from the coax. But maybe not. There was an article in QST years ago (July 2000) called "Everything Works" where a guy made QSOs using a light bulb for a load. It was a much better period for propagation though. I found it on line here: At OzarkCon this year I used a 50 ohm resistor inserted into a small loop of wire for the in-hotel QSO party. I was amazed to work a station in an adjacent state on that arrangement. 73- Nick, WA5BDU
On Tue, Aug 13, 2019 at 2:50 PM Duane Brayton <dwbrayton@...> wrote:
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Re: The Lightbulb QSO Party
Try to use a bulb that will be near 50 ohms resistance under load.
On Aug 13, 2019, at 12:18 AM, "Gary Kohtala via Groups.Io" <yahoo.com@groups.io target=_blank>gary.k7ek=yahoo.com@groups.io> wrote:
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Re: The Lightbulb QSO Party
John T. Fitzer
Please be careful using higher wattage bulbs for dummy loads. I fear someone’s hearing may be damaged if you were to use a 1KW projection lamp with a 1 watt transmitter, not to mention the possible damage to one’s eyes from looking at the extremely bright light. Ah yes I think we may have figured out the answer to the worlds energy, just use a bigger load. 73. 1415926535
From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io]
On Behalf Of W6BOW via Groups.Io
Sent: Tuesday, August 13, 2019 11:06 AM To: main@4SQRP.groups.io Subject: Re: [4SQRP] The Lightbulb QSO Party
Gary,
I haven't a final solution to your interesting question. My guess is that efficiency would increase with increased bulb wattage rating due to less energy loss in heating the filament assuming that the "bulb" is a filament type?
I happened upon the following conversion table most "illuminating" while pondering your query …
How to convert watts to lumens
73
Don Buckter - W6BOW San Francisco CA USA
-----Original Message----- If one uses a 100w bulb instead of a 6w bulb will the resulting signal be significantly stronger? 😉🙈 Best regards, Gary, K7EK Sent from BlueMail On Aug 9, 2019, at 19:20, Paul Smith <n0nbd@...> wrote: Sounds good to me. I have used a 6 watt exit light bulb and socket as a dummy load and it worked fine. I used it once with a home brewed tuner and tuned for full brilliance hi hi de Paul
Sent from Outlook From: main@4SQRP.groups.io <main@4SQRP.groups.io> on behalf of Walter - K5EST <walter.k5est@...>
For many years OzarkCon has been the host of the famous Dummy Load Antenna QSOs. An example is at Terry's WA0ITP website.....
Now we have another challenge.....The Lightbulb QSO Party.......
Have not tried the lightbulb in a long time but they do work, and be careful because you may see the SWR gradually jumping High! Old school filament lightbulbs are used!
73,
Walter Dufrain - K5EST - QRPcw ..... Four St@te QRP Group .... .... Navy Amateur Radio Club ..... ......... St Louis QRP Society ....... . Community Service Radio Club .
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Re: The Lightbulb QSO Party
WD5GLO Lou
I guess feeding it with a hundred feet of ladder-line is out of the question...HI
On Aug 13, 2019, at 11:15 AM, J.K. Wright <wrightjk@...> wrote:
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