Re: I¡¯m doing a little survey of people that have rotatable antennas.
I use the makers rotor controllers.? One less cable, plus computer to configure.
Besides, the computer logger can't guess what station you are trying to work until you are ready to log the QSO.?
On any band below 2 meters.? 30 degree pointing is close to perfect.
On Thursday, June 13, 2024 at 12:43:55 PM PDT, Joy Rabins <doghouse3@...> wrote:
Do you just use the controller that comes with the rotor to exclusivity rotate your antenna,? or do you add a third party box that allows you to have the? computer control your rotor with your logging software??
Thanks,?
Joy?
N6GO
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I¡¯m doing a little survey of people that have rotatable antennas.
Do you just use the controller that comes with the rotor to exclusivity rotate your antenna,? or do you add a third party box that allows you to have the? computer control your rotor with your logging software??
Thanks,?
Joy?
N6GO
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I plan to be there for lunch but I will have to leave afterwards.?
Joy
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Even the Martians are feeling it
If you are having problems with the bands, so are the hams on Mars.?It appears that even ET8 has been affected. Here is probably the reason.?
| | Mars scientists have been anticipating epic solar storms ever since the sun entered a period of peak activity earlier this year. This peak in the 11-year cycle is called solar maximum (.) Over the past month, NASA¡¯s Mars rovers and orbiters have provided researchers with front-row seats to a series of solar flares and coronal mass ejections () that have reached Mars, in some cases, even causing Martian auroras.?.
EarthSky News |
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I plan to be at the Baylands starting with lunch. Hope to see many of you.
Hiroki AH6CY
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I wouldn't discourage you from adding it. If it shorts, it's easier to replace than a FET, cheaper?too. --Jeff
On Tue, Jun 11, 2024 at 11:19?AM Doug Hendricks via <ki6ds1= [email protected]> wrote: And can anyone give me a reason not to install the diode?? I'm trying to learn?
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I've been in chester the past several weeks, and the blustery winds kept me from putting up antennas.? The road thru lassen is not yet plowed, so no hf or vhf ops for me.??
As Cliff mentioned, nearly all 6m activity is ft8 on 50.313, and despite calling CQ on the SSB and CW freqs during openings, they are nearly dead.? This is a far cry from the old days when we left our 6m rigs squelched on the calling freq, and when 6m opened, it was like 50 people shouting at once all of a sudden.??
If I make it back this week, I hope to see you on Friday.??
On Tue, Jun 11, 2024 at 3:27 PM, Cliff Sojourner K6CLS via groups.io <cls@...> wrote: Last Saturday during the VHF contest I heard some ops on 2m QSY to 6m, fm, 52.525.? so that's 2.? Otherwise, yeah all the action is FT8, 50.313.? no CW, SSB, AM.? Shame, waste of 4MHz.
Contest wise, the strategy is to make 6m QSOs to get grids for score multipliers.? 6m is worth only 1 point, so spend most of the time on higher bands, 2 and 4 point QSOs.
That said... What if they gave a contest and nobody came?? Saturday was ghostly, very little action.? Sunday we made oatmeal cookies instead.
Cliff K6CLS CM87 On June 11, 2024 12:59:14 AM PDT, "David via groups.io" <dkvarn@...> wrote:
...meters, that is. I have a vintage Heathkit SB-110A 6-meter transceiver that I purchased c. 2000 and am considering selling on ePay. I was hoping to get it going for the first time this past weekend (I have a pretty good rig backlog) and using it on SSB during the ARRL VHF Contest. I did the usual vintage rig prep. Unfortunately the transmit section seem kaput, but the receive section seems to be working.?
I did not hear the expected SSB signals--did any of y'all? I did hear tones around 50.16 and 50.31 MHz--I understand the latter is FT8, yes? As to the former, online info indicates that it is used by Radio Scouts / Jamboree on the Air, JOTA. Anybody familiar with that?
A member recently mentioned that to test an SSB transmitter, one could use a phone app to generate FT8 audio, play the phone's audio into the mic of the transmitter and use PSK Reporter as a reverse beacon.?
How about the inverse, i.e., play FT8 audio through an SSB rig's speaker and use a phone app to listen and decode the FT8 signal (?) I could more fully verify the SB-110A's receiver operation that way.
I'm also thinking of doing a video including the received FT8 audio and posting the video in the eBay listing.
Thanks, and best, --David KM6RI
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Last Saturday during the VHF contest I heard some ops on 2m QSY to 6m, fm, 52.525.? so that's 2.? Otherwise, yeah all the action is FT8, 50.313.? no CW, SSB, AM.? Shame, waste of 4MHz.
Contest wise, the strategy is to make 6m QSOs to get grids for score multipliers.? 6m is worth only 1 point, so spend most of the time on higher bands, 2 and 4 point QSOs.
That said... What if they gave a contest and nobody came?? Saturday was ghostly, very little action.? Sunday we made oatmeal cookies instead.
Cliff K6CLS CM87
On June 11, 2024 12:59:14 AM PDT, "David via groups.io" <dkvarn@...> wrote:
...meters, that is. I have a vintage Heathkit SB-110A 6-meter transceiver that I purchased c. 2000 and am considering selling on ePay. I was hoping to get it going for the first time this past weekend (I have a pretty good rig backlog) and using it on SSB during the ARRL VHF Contest. I did the usual vintage rig prep. Unfortunately the transmit section seem kaput, but the receive section seems to be working.?
I did not hear the expected SSB signals--did any of y'all? I did hear tones around 50.16 and 50.31 MHz--I understand the latter is FT8, yes? As to the former, online info indicates that it is used by Radio Scouts / Jamboree on the Air, JOTA. Anybody familiar with that?
A member recently mentioned that to test an SSB transmitter, one could use a phone app to generate FT8 audio, play the phone's audio into the mic of the transmitter and use PSK Reporter as a reverse beacon.?
How about the inverse, i.e., play FT8 audio through an SSB rig's speaker and use a phone app to listen and decode the FT8 signal (?) I could more fully verify the SB-110A's receiver operation that way.
I'm also thinking of doing a video including the received FT8 audio and posting the video in the eBay listing.
Thanks, and best, --David KM6RI
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And can anyone give me a reason not to install the diode?? I'm trying to learn?
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The diode is between drain and source on fet.? Source is ground.can you explain why it works??
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There are two different mechanisms for reverse breakdown in diodes: zener and avalanche.? Generally diodes with low reverse breakdown are in the zener mode and diodes with higher breakdown voltages are avalanche.?? I think the "dividing line" is somewhere around 5 volts.?
That said there are many diodes made and used because of the reverse breakdown.? Very seldom does the part catalog point out the difference.? And in 99% of the time that's not important in the use of the diode.
Now back to the transmitter and high SWR.? There is a video showing the rig survived when connected to a short cable and SWR measurement device.? In this case the "load" on the transmitter is an open. Now, if one was to connect a 1/4 wavelength of cable ( simply just a short) the transmitter would still see really high VSWR, but it would be 0 Ohms.
Different loads will have different effects on the transistor.?
Now back to the photos showing the diode.? I don't have a schematic and PC layout, but I think maybe the diode is not connected directly to the FET, but to VDD with a coil or choke between that point and the actual FET. In this case, it would prevent the reflected RF signal from raising the FET voltage into the danger zone.
At this time, I have enough radios that I'm not planning on another.?
On the subject of "too many radios".? There was a recent microwave contest.? Because I got bonus multipliers for QSO's on 24 and 47 GHz, I finished in the top 3 individual scores in the country.?
On Tuesday, June 11, 2024 at 10:17:55 AM PDT, Jeff Reagan <jeffreagan@...> wrote:
It gets back to the question: is the Avalanche Breakdown characteristic of the FET more delicate than that of a 1 watt zener. Maybe the 1 watt zener is tougher than the FET. Counterintuitive results are everywhere.
On Tue, Jun 11, 2024 at 10:12?AM Doug Hendricks via <ki6ds1= [email protected]> wrote: Doesn't Hiroki's video disprove that?
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It gets back to the question: is the Avalanche Breakdown characteristic of the FET more delicate than that of a 1 watt zener. Maybe the 1 watt zener is tougher than the FET. Counterintuitive results are everywhere.
On Tue, Jun 11, 2024 at 10:12?AM Doug Hendricks via <ki6ds1= [email protected]> wrote: Doesn't Hiroki's video disprove that?
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The zener in the video is connected across the FET, between source and drain. That zener is definitely not subjected to RF AC output voltage.
On Tue, Jun 11, 2024 at 10:06?AM Jeff Reagan via <jeffreagan= [email protected]> wrote: There's another possibility: the zener is so weak, it blows open the instant the transmitter comes on.
Here is an empirical proof to show how a single 1N4756 zener diode actually protects against high SWR.?
I ordered a bag of 10 1N4756As. I won¡¯t need all of them. Anyone who needs one would be welcome to get it from me on Friday (if they arrive before then, if not another Friday.)
Hiroki AH6CY
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Jeff Reagan
Cliff Sojourner K6CLS