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Messages - vwflyer

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Antennas / Re: Linked Dipole
« on: June 27, 2018, 10:44:27 AM »
Everything is a trade off. If you can handle the size and weight of RG58 you have a bit of an advantage using it over RG174. But itís a personal choice. Many people go to great expense and inconvenience to squeeze every last dB out of their rig. Others say, ďwith one feedline my radiated power is 4 watts and with the other itís 3.5 watts. If they canít hear me at 3.5, chances are they wonít hear me at 4 eitherĒ.

I will say though, that if youíre going to put up with the size and weight of RG58, you might as well switch to RG8X. Itís basically the same size and weight as RG58 but with markedly less loss.

You might consider a compromise. Use a length of 58 and a length of 174. Connectors add very little loss if theyíre clean and tight. You might also want to use zip ties or Velcro ties or tape or something to attach your coax to your mast below the feed point to act as a strain relief to the higher part of the mast where itís too thin to support the weight of all the coax.

Antennas / Re: Linked Dipole
« on: June 25, 2018, 05:17:03 PM »
More noise often times simply means youíre antenna is more effective.

New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 20, 2018, 11:12:42 PM »
You defiantly will not regret learning morse code. Itís not like buying a computer interface to run FT8 and after a few contacts getting bored of it and regretting the purchase. Learning morse code is a lot more rewarding and even if you eventually bore of it, it will always be useful. Itís not a product, itís a skill.

I agree that digital modes like FT8 have limited usefulness to the preppers but thatís not their target users. On the other hand, FSQ was designed specifically for emergency comms. Modes like FSQ and Olivia are very handy to the emergency communicator. FSQ can even send messages while the receiving station doesnít have an operator present at the radio.  They perform better than CW. They can send faster and in worse conditions. Their only downside is that they require a computer. This adds weight, complexity, points of failure, and power requirements. If you can afford the additional weight and power requirements they are a good way to go.

I have an IC-706 in my suburban and am setting up a mobile station that can run digital on all HF bands. This mobile station will be able to run digital modes for extended periods of time until I run out of gas. Then the foldable 22 watt panel will allow me to run the station for short intervals.

Antennas / Re: Linked Dipole
« on: June 20, 2018, 01:04:10 PM »
Sotabeams makes some good stuff. That looks like a nice balun. If you can set up a wispr beacon it might be a good way of doing direct comparisons of the antennas.

New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 20, 2018, 12:19:01 AM »
Code: [Select]
This thread got me thinking though, when was the last time I even heard a QRP station?
Do you do much CW? Iím in the El Paso area and I have regular QSOs with QRPers on CW. Iíd estimate that ľ - ⅓ of my CW QSOs are with someone running QRP.

New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 19, 2018, 01:41:17 PM »
But not everybody can afford (learn) it. Although CW seems like a really useful thing to know, I personally prefer talking SSB.

You can afford what you value.

General Discussion / Re: Looking for Survival Camp Ideas
« on: June 15, 2018, 02:46:01 AM »
Agreed! Avoid real distress calls!
A simulated emergency call should have some goals to be met to prove that the exercise  was successful though. When organizations like ARES demonstrate their abilities to public service agencies, they have to show the value of the radio by proving that important/life saving communications can reliably be handled by their radios. They do this by transmitting non-important but equally challenging messages. Things like your coordinates are a good test of successful communication since it's something that can easily get messed up in the transmission with all those numbers (number don't have context to help fill in the blanks), and it's something that would likely have to be transmitted in a real crisis. It also involves other survival skills like being able to read a map or use a GPS, so it ties the radio in with the rest of the outing.

General Discussion / Re: Looking for Survival Camp Ideas
« on: June 14, 2018, 01:43:07 PM »
And as for simulating a distress call, perhaps you can prearrange a call with a ham you know. Have the scouts provide you with coordinates from a map or gps. Make it vary clear on the air that itís an exercise or simulation and make the information passed benign so that other hams donít get excited by tuning into the middle of the QSO.
If you can set up a 60 or 80 meter wire you can be pretty sure of solid local QRP contacts using NVIS.

New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 12, 2018, 11:04:59 PM »
The main advantage of qrp rigs is power drain. Qro rigs in qrp mode drain much more power than pure qrp rigs.

That's true. The 817 realistically draws what on receive, 350ma? Most QRO rigs can be made to draw something in the area of 1 amp if you turn down or off some settings. That's a realistic difference of a solid 500-700ma. Figure 600ma at 12.5 volts and we have 7.5 watts of power savings.

Of course the oft-quoted downside of QRP is it's less reliable ability to be heard. To help overcome this handicap, more efficient modes are used, i.e. CW and digital. The problem with CW is that it kind of requires that the operator learn it. The problem with digital is that it requires a separate computing device, which also draws juice, cutting into your power savings. A laptop is the most convenient platform for working digital but it's also the most power hungry. A smartphone is the least power hungry but kind of inconvenient with it's small interface. A tablet is often chosen as a happy medium. The screen of a tablet is the most power hungry part of it, and unfortunately, outdoor/portable use generally means that the screen brightness has to be turned up to see it in the daylight. An iPad Mini at full screen brightness has been measured to draw about 4.5 watts. This makes your power savings only about 3 watts over a QRO rig that doesn't use the iPad. 

So at a battery voltage of about 12.5 volts that comes to an additional 240ma draw on the battery that a QRO rig has over a QRP rig coupled with an iPad Mini. That means that if you want to be able to have 8 hours of receive/monitor time, you'd need a battery that was about 2ah bigger to do so with a QRO rig vs a QRP rig/iPad combo. The difference in size and weight between a 7ah battery and a 9ah battery is pretty minimal and may well be worth it to have the option of going QRO when you need it.

I'm not saying that the 817 is a bad choice. I would certainly own one if I could convince myself that I needed one, and I almost have on a few occasions. It does everything under the sun and coupled with a small power amp can certainly take the place of a shack rig. It's an all around work horse. But to make it a reliable mode of communications, one has to either learn CW or concede that it's power savings over a QRO rig are going to be modest.

New To Radio / Re: QRP from a beginners view
« on: June 02, 2018, 11:50:48 AM »
Thatís true, they do, because there is no electronic keyer involved. Sides swipers and cuties are also aloud. Pretty much anything that doesnít involve electronics. But straight keys still rule there and whatever type of manual key is being used, speeds are still relatively slow.

New To Radio / Re: QRP from a beginners view
« on: June 01, 2018, 11:00:15 PM »
Congrats on your ft817 purchase. I've never owned one but I don't think you can go wrong with one.

I have done some QRP SSB though, and I can say, it's not for the impatient. Contacts are rewarding and as Gil says, with practice you will make more and more. There are tricks to QRP, like calling a guy right after he finishes a QSO with someone else (tail ending), checking into nets, break into a rag chew where the people sound friendly and inviting, answering other's CQ's rather than sending one yourself.

A good way to test the abilities of your station is to make contacts with people you know are listening for you. Set up a sked with someone on this forum or any other of the numerous web forums. Send an email to someone in your local ham club asking if he's free for a sked. Even during this time of low sunspots, 80 meters NVIS works wonders, even at QRP, for local and regional contacts. Or activate a SOTA summit and spot yourself. You will be the center of a pileup in no time and most of your chasers will give you realistic signal reports.

A great forum to set up skeds with people is the Straight Key Century Club (SKCC). They have a webpage just for setting up skeds with other people who use a straight key. It's a great way to get your feet wet with CW. Since everyone is using a manual key, the speeds are slow and the people patient. Plus, for QRP, CW has several db advantage over SSB and your experience making CW QRP contacts will be more akin to making SSB contacts at 100 watts.

You've got a great setup. Stick to it and don't get discouraged. If you're not careful it may become an addiction.

Antennas / Re: Tuning the QRPGuys vertical tribander
« on: June 01, 2018, 08:43:13 PM »
Gil, Thanks so much for pointing out what should have been obvious. I feel like a fool for not thinking of it myself. It works like a charm. If I run the coax inside the bead without any loops I have to have the bead up by the base of the antenna. If I loop it through just once (like in the photo) it gives me perfect SWR on the HB-1B meter no matter where it is on along the coax. It even shows low SWR over a much wider range of the band.

Antennas / Re: Tuning the QRPGuys vertical tribander
« on: June 01, 2018, 01:08:01 PM »
Good idea Gil!
I'll try that today.

Antennas / Re: Tuning the QRPGuys vertical tribander
« on: May 31, 2018, 09:13:56 PM »
Thanks Gil,
I put one wrap back on the inductor and tried it with both lengths of coax and my HB-1B. It seems that I  can operate the lower part of the CW portion when using 3 feet of coax 7.025-7.055 and I can operate the upper portion of the CW band with 9 feet of coax 7.055-7.100. Have other people experienced such a narrow Q on 40 meters? Perhaps I should buy QRPGuys QRP tuner and use that when using this antenna on 40 meters. I don't think I will use my MTR3B on 40 meters with this antenna without a tuner. I can't risk running a high SWR and not know it with that rig.

Antennas / Tuning the QRPGuys vertical tribander
« on: May 30, 2018, 10:34:44 PM »
Hey guys,
After reading many positive  comments here about the QRPGuys vertical tribander I decided to get one. It went together quickly and after a little adjustment got it working with very low SWR on 20 and 30 meters. I was using the built in SWR meter on my YouKits HB-1B. I know not the most accurate but it's what I have for QRP levels. Resonate on 40 meters was way to low so I wound up removing 2 wraps from the inductor and that got it up to where I need it. I was using just a short 3 foot coax jumper to connect to the rig. I decided to add 6 feet of coax to make sure it doesn't change anything. On 20 and 30 it didn't change much but on 40 it is now resonate way up in the voice part of the band with the extra length of coax attached. That is, unless I have my hand under the back of the rig, then the resonate freq comes back down to the CW part of the band. I'm thinking that I will probably operate this antenna with longer pieces of coax since I don't want to be tethered so close the the base of the antenna to operate. I can add a wrap or two back onto the toroid since I haven't yet snipped off the excess I had after taking two wraps off but that part of the wire is no longer insulated. What happens if uninsulated magnetic wire rests against the toroid? It will be fine as long as it doesn't come into contact with uninsulated wrap right next to it right? 

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