I have all the toys. What I don't have is the field operating time. So, last Sunday I was reminded that the monthly Georgia AUXCOMM net was scheduled for 1400 hours and I figured it was the perfect time to get out in the field and 'play radio'.
I wanted to see if I really could stuff everything I needed into my DSLR backpack, go to the field, set up and operate effectively on voice and digital modes. Is this a truly viable concept?
|Amazon Basics DSLR backpack|
Some things have changed since I took this picture a few months ago. I've ditched the tablet keyboard in favor of a small, inexpensive folding Bluetooth keyboard, I've replaced the Comet Antenna HFJ-350M 'toybox' antenna set (which is a well made piece of junk) for the Elecraft AX1 vertical, and for Sunday's test I substituted the MAT-705Plus tuner for the Icom AH-705, just to save space. I also included my PowerFilm LightSaver Max battery pack in lieu of the Bioenno 4.5 amp hour LiFePo battery.
I gave myself an artificial time limit - 30 minutes to be set up and operating at a minimal level of voice and digital capability, and if necessary improve the setup as time goes on. But fate makes fools of all plans, and when I got to my first choice for an operating location - a school parking lot at a high spot in the county - I was surprised to find it full of cars. There was some sort of a children's basketball camp going on. Really? On a Sunday afternoon? So, immediately switching to Plan B (which I had not yet formulated), I headed to what's become a default location for a lot of my club's operating activities - The Ridge Nature Area. By the time I got there I was down to less than 20 minutes before the start of the net. Time to improvise. My plan had been to set up an end-fed long wire antenna, but there wasn't time for that. I knew the Elecraft AX1 wouldn't give me the reach I needed. So I was forced to look outside of my DSLR backpack for a solution. It came down to my trusty old Chameleon vertical. By chance I had the components in the bed of my pickup, so it was available, and it's fast to set up.
By hustling a bit I was able to get set up and operating on HF voice just as the net opened.
In all, it was effective. I was having trouble being heard by net control, who was located down near Savannah (I'm just south of Atlanta), but I think that's because I was operating on only 5 watts. I had another station (ironically located north of Atlanta and also operating QRP) relay me in. If I had bumped up my power to 10 watts I'd have done better, and I'm convinced that if I had set up the end fed long wire I'd have done a LOT better.
So this gets me back to a question I've posed in the past - is 10 watts enough for emergency communications? No, 10 watts is not enough for assured communications. I wouldn't bet my safety, or my family's safety, on just 10 watts, not unless I had no other choice. And I do have other choices - 100 watt rigs. But these 100 watt rigs are overkill in terms of size and weight, and draw so much power that they require large batteries or power supplies. What the civilian EMCOMM community needs is a good, weather resistant, battery powered 50 watt (or even 20 watt) HF radio that incorporates all the modern bells and whistles: USB for rig and digital sound card control, built-in tuner, battery pack, Bluetooth and wi-fi. The answer actually sits before us in these pictures - a 50 watt version of the IC-705. C'mon Icom, get 'er done!
OK, back to Sunday. While listening to the net check-ins and waiting for my turn, I was able to get my tablet set up and synched with the radio via wi-fi. It's fast and easy using Icom's RS-BA1 software. Then it's a simple matter of firing up Winlink and finding an open frequency.
A few observations:
- Overall, the concept works. It is possible to put an effective EMCOMM voice and digital station in a backpack. OK, using the Chameleon vertical was a bit of a cheat in this scenario, but I've tested the Elecraft AX1 (17, 20 & 40 meters) enough to know it actually works, particularly on digital modes, and the ParEndFedz end fed long wire antenna (about the size of a small bundle of twine) is a proven performer on 10 - 40 meters, and can be coaxed to work on 75 meters if I use the Icom AH-705 tuner
- Can I carry the Chameleon vertical antenna on this backpack? Yes. I'd need to carry the antenna sections, the Chameleon ground spike and at least one ground radial, but it should all fit if I lash the antenna sections to the outside of the pack
- The MAT-705Plus tuner works quite well. It's not as versatile as the AH-705, but if you don't need to tune a random wire antenna this tuner works fine, plus it's a fraction of the size of the AH-705
- After recently testing almost a half-dozen small format Windows laptops and tablets I've come full circle, and I'm back to the Trimble T10. It simply can't be beat, and I think it sets the bar for a Windows tablet or laptop for EMCOMM use. More on this device in a later post. The folding keyboard is an inexpensive little gizmo I picked up from Amazon, and while it's a bit awkward, it's no worse than the official T10 detachable keyboard, plus it's a lot smaller and lighter
- I thought the DSLR backpack I got from Amazon would just be a stopgap until I found a better solution. I've had a chance to handle a few DSLR bags from other manufacturers and, to be honest, the Amazon Basics bag is actually pretty darned good by comparison. It's not rugged enough for daily use, but for occasional trips to the field it's perfectly fine. Plus, it's about 1/3 the cost of an equivalently effective 'pro' model
- A small throw weight and line for getting antenna support lines up over tree limbs is essential. Right now I'm just tossing any available object (sticks, rocks, small dogs) over tree limbs, with only limited success. Time for a better solution that fits with this backpack station concept
Great article and it was nice to hear you on that net. My wife KI4HHI and I do SOTA activations together, but she doesn't want me to "play radio" all day on the summit. Our agreement is that I get one hour to activate. In order to make that happen, I have made my setup / takedown as efficient as possible. Like you, I use a 705. I normally operate it out of the pack and it's all wired up except for the antenna. I use an EFHW 10/20/40 because it's resonant on those bands and takes hardly any time at all to setup. We normally setup in 5-7 minutes - the biggest time hog is finding the right tree limb to hang the antenna. 73 de KI4ASKReplyDelete