AmateurRadio.com

I just had a reply from the RSGB’s ETCC regarding my NoV application. In a nutshell, applying for an NoV to use a 2m frequency for a personal short-range node is a non-starter as “it would be entirely inappropriate for RSGB to assign one of the scarce channels available within the 2M band for your personal use.” However it is possible to use provisions already in the license for “remote control of your station” to operate on any frequency I choose, without an NoV. So I have asked them to withdraw my application.

As a holder of a full UK amateur radio license, there are apparently no restrictions on frequency or power that I can use for the remote control circuit (other, of course, than those that apply to normal amateur radio operation.) However the link has to be “adequately secure” to prevent unauthorized transmissions. Typically for a legal document, no specific guidance is given as to what “adequately secure” means from a technical point of view. Limiting the power – or, perhaps more importantly, the receiver sensitivity – so that it cannot receive anything other than my own transmissions might be good enough, but I certainly would not consider it adequate security for my WiFi network (though a few years ago, before everyone got WiFi equipment, I certainly used to.)

Using a transceiver that supports DCS like my FT-817 – as I am currently doing – might be considered acceptable, though it wouldn’t take too long for someone to run through all the available codes and find out which one I am using. However I don’t want to use the FT-817 for this forever, I’d prefer to find something cheap that I can dedicate to it, and most of the cheap ex-commercial radios don’t support things like DCS. They also run too much power. So at the moment I’m not sure what the best long-term solution is.

I hate to admit it, but I can see that D-Star has the advantage here. Being digital, it knows who is calling in to the system. I presume that the DVAP Dongle has a facility to limit access to your own specific call, which would solve the security issue once and for all.

Perhaps I’m worrying too much about this. After all, the reason I’m doing this is because there is very little local VHF FM activity receivable from here. Which means the likelihood of anyone accessing my node, even if it was unsecured, is practically zero.

Postscript: I think I may have found the solution.

If you’re a regular reader of this blog you’ll probably have observed my comments about the lack of activity on VHF hereabouts. Even though I can raise three 2m repeaters there is next to no activity on any of them. And although there are several active amateurs in West Cumbria most are “over the hill” from me so I never hear them.

Some time ago I thought about setting up an EchoLink node to make it possible to have some contacts on VHF. But when I realized how much trouble I would have to go to in order to get permission for this I went off the idea pretty fast.

My interest in this basic idea was rekindled when I read recently about the D-Star Digital Voice Access Point. Personally I’m not going to be interested in D-Star until the prices of compatible radios come down and you can buy them from other manufacturers than Icom. Besides, I like my little TH-F7E with its wideband AM/FM/SSB/CW receiver and don’t want to change it for one that doesn’t have that facility. But why shouldn’t I set up a very low power EchoLink node for my personal use so I could make some contacts using my TH-F7E hand-held from round and about the house?

I put in an online application for a Notice of Variation (NoV) to my license to run an attended simplex node – which so far hasn’t made any progress. However, fellow blogger Tim G4VXE writing about his experience with the DVAP mentioned that he made some quick enquiries via the RSGB’s ETCC as to the legality of using the DVAP without an NoV and they were not concerned about DVAPs or hotspots as long as there is no third party traffic.

I presume that D-Star, being digital, knows who is calling in to the system so you can set it so only you have access. With EchoLink you can really only have security by obscurity, using low power, a poor antenna and an obscure frequency so that it won’t pick up transmissions from anyone else. I’m not sure if this meets the official standards for not allowing third party traffic, but my enquiry to the ETCC has also gone unanswered (so far.) I got fed up with waiting and decided to go ahead.

I first tried EchoLink many years ago when it first was announced. At the time I had no way to access the system except direct from my computer. After making a few contacts that way I found that talking to hams without using any radio wasn’t very interesting, so I didn’t use it again.

Even though I am only using RF to make the link of a few metres to the radio connected to the computer, because I am using an actual radio it really feels like I am making a radio contact. I have set up the G4ILO-L node so that it doesn’t allow connections from computer-connected users. There may be disadvantages to this and perhaps some will consider it a bit unsociable but I still feel that using amateur radio at each end of the link is an important distinction that differentiates EchoLink from internet chat. I can still join EchoLink conferences and conferences may include directly connected users so talking to people who aren’t using a radio isn’t completely ruled out.

I dare say there are some who will still consider that making contacts in this way isn’t amateur radio. But the fact that my RF is not going directly from my radio to his is of no great importance as far as I am concerned. This isn’t meant to be a way to explore propagation or work DX. It really isn’t much different from using a repeater.

If I find that it is worthwhile keeping my EchoLink node running then it will create a couple of new radio projects to work on. I will need to make a new computer/radio interface and either build or modify a radio that I can dedicate to the link so that the equipment I am currently using for it can be released for other uses.

Because I signed up for EchoLink soon after it was announced I have a coveted low node ID number: 3098. I have swapped this number over to use for the link. The G4ILO-L node is running low power to a leaky dummy load so it can only be used to contact me. If you have access to the EchoLink network by radio, please give me a call. It would be great to talk to you.

The Digital Voice Access Point (DVAP) Dongle is a small device now available in the US that plugs into a computer and lets you create your own low power (10mW) RF gateway to the D-Star network.

Leaving aside my dislike of D-Star (it is incompatible with existing radios and requires you to purchase an Icom radio to participate, which in my book makes it effectively a proprietary system) for a moment, as someone living in an area where you hardly ever hear any 2m FM activity I can see the attraction of something like this. It would allow one to make some internet-linked ham radio contacts from around the house using a hand-held.

A couple of years ago I started looking into the idea of setting up a low-powered personal EchoLink node, for similar reasons. I prefer EchoLink to D-Star for the simple reason that almost any existing FM radio can use it (as long as it has a DTMF keypad). EchoLink has been going for years and already has a critical mass of users, which is surely more important from the point of view of finding people to talk to than using some new and more state of the art system?

Unfortunately it appeared that in order to set up an EchoLink node I would need to apply for special permission, providing details of three people who could turn the equipment off on instructions from Ofcom, wait months for permission to be granted, etc., etc., which is way too much hassle. I don’t think you are exempted from this procedure simply because the RF output power of the node is very low. Because of this restriction doubt if many people in the UK will be using the DVAP Dongle either.

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