Codan Selcall (Or lack there of)

Submitted: Monday, Aug 15, 2011 at 08:25
ThreadID: 88476 Views:3746 Replies:4 FollowUps:7
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I have two Codan HF radio's (8525 & 7727) both in perfect working order which I use every other year on outback trips. Neither are fitted with selcall.

To retrofit or upgrade these radios with would cost at least $500+++ (Jenal mike or fit boards etc).

I also have an Android phone which is a wonderful device & capable of amazing things with the right application. I would love to find a keen 4WD'er & Codan user who is also an Android app developer to develop an app which produces Codan selcall tones for beacon calls and signalling others.

Could be lucrative as I'm sure their are many Codan owners without selcall would gladly shell out say 50 bucks to get it. I know I would.

Any Takers?


Wozz (Robbie)

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Reply By: Member - Boobook - Monday, Aug 15, 2011 at 08:56

Monday, Aug 15, 2011 at 08:56
Very interesting idea Wozz

When the Flying Docter went to VKS, there was discussion of Jenal making a special device to do just what you are suggesting. I don;t think it ever went anywhere.

Also there is info on the technicalities for the selcall format on the yahoo codan forum.

I think it would be a great idea to suggest it to

4)Menbers of the codan yahoo forum.

Actually RFDS and / or VKS do have a moral obligation and a need to ensure cost effective comms to RFDS and yours is the best idea I've heard to date. Even if you don't have an android, a cheap one would be less expensive than dedicated hardware anyway.

You may have created a new market for older HF's. I hope someone takes you up on it.

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Follow Up By: Wozzlegummich - Monday, Aug 15, 2011 at 09:13

Monday, Aug 15, 2011 at 09:13

One thing I forgot to stress is this is NOT a money making idea for me, although I would wish a developer all the best if he was to glean a few sheckles on the run through.

I know there are a few websites where you post an idea for Win/Mac software and programmers bid/quote on it for development but don't know if there is such a thing for Android/iphone. I like the Android model better as I like the whole open-source ethos.


Wozz (Robbie)

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Follow Up By: Member - Boobook - Monday, Aug 15, 2011 at 09:32

Monday, Aug 15, 2011 at 09:32
Wozzlegummich posted:

One thing I forgot to stress is this is NOT a money making idea for me....

That was clear from your OP Wozz.

If RFDS took it onboard they could make it part of a general RFDS app. But they would probably do Iphone first :-(

The idea has much going for it.

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Reply By: jenalcomms - Monday, Aug 15, 2011 at 11:33

Monday, Aug 15, 2011 at 11:33
Ok, to put people properly in the picture, we (Jenal Communications) called for expressions of interest from RFDS/VKS737 (and other) users to see how many were interested in a stand-alone solution for a selcall encoder. We got a grand total of 5 interested people - not exactly earth shattering! And certainly not enough to base the development of a new product on.

We therefore decided to not proceed with the development of a stand-alone device. A few months later we got the opportunity to obtain a small batch of microphones suitable for building our SC2/SC3 microphones and so we decided the best course of action was to build a new batch of SC2 (selcall/telcall) microphones only and sell them at the price we were previously selling the SC3 (selcall only) microphones. When this batch is sold I don't think we will be making any more.

The numbers just aren't there to develop a new product - even one based on a laptop/soundcard or Android/Ipad/Iphone or similar. To put things in perspective we have sold between 5 and 10 microphones a year into the Australian market (most go overseas). Certainly not enough to develop an app for a smartphone. Even if we sold say two or three times this number it still isn't cost effective to produce such an app (see my previous comment about how many people expressed interest in a stand-alone device!). By the way, out of the 5 people interested in a stand-alone device, only one has purchased a microphone as a solution.

So let's say we sold 20 apps in a year at $50.00 an app, that would equate to a massive $1,000 a year income. Not a very good return for the amount of work involved in the development especially when you consider the requirement for external selcall devices is diminishing as more people purchase more recent secondhand radios which already have selcall facilities.

Well, there we have it. I was prompted to make this post by an e-mail sent to me by another member (thanks Tony) suggesting a smartphone app to sell for $10 to $20 (equal to $200 to $400 a year in sales?). I hope I have explained the practicaities/economics of developing an app (or even a stand-alone device) like this. I'm sure there is someone out there who would relish the idea of making an app for his own use and then selling it to others, however it's a fairly big task that has to be thoroughly tested for reliability and interoperability. You can't just throw something together that works some/most of the time and then market it - although some software vendors seem to have been doing that for years!!

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Follow Up By: Wozzlegummich - Monday, Aug 15, 2011 at 12:38

Monday, Aug 15, 2011 at 12:38

Agree completely.

I was thinking more along the lines of an enthusiast produce an app in their spare time. It definitely wouldn't be something to plan your retirement on but a person with low overhead could make a bit of pocket money on it. I'm gonna throw it open on some of the Android forums I lurk on to see if i get any bites.

It would never be a replacement for the SC2/3 as there will be no receive capability.

I've got a sneaking suspicion that just I've gotta stop being a tight-a*se, bite the bullet and get an SC2/3. (On a separate issue if I get an SC2/3 can it be configured to swap easily between the 7727 & 8525?).


Wozz (Robbie)
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Follow Up By: jenalcomms - Monday, Aug 15, 2011 at 13:45

Monday, Aug 15, 2011 at 13:45

OK on the enthusiast side. I think it would have to be someone who needs the facility themselves and who is prepared to do the necessary "soak" testing. As I said, it's not the sort of you can just throw together and hope for the best, especially as someone may be relying on it for safety/emergency purposes.

No reason why you cannot use the SC2 on both a 7727 and an 8525, with a couple of provisos!

1) The 7727 & 8525 mic sockets are different so I would suggest either a small "adapter" cable for one radio or (preferably) replace the 7727 mic socket with the same type of socket that is on the 8525 and rewire the connections to be the same.

2) The 7727 switches the positive rail to PTT. The SC2 cannot do this, however a slight rewire and the addition of a small relay in the 7727 will allow the normal ground to operate the PTT so that both radios will work with the same mic (SC2 or not).

Note: some 8525 radios (especially ones that were designed to work with data) also have problems being PTT'd by the SC2. Again the solution is a small relay to control the PTT circuit. The problem is apparent when the radio does transmit but with a very low output power, adding the relay fixes this.

I've never yet met a radio that we were unable to interface an SC2 or SC3 onto. Some require a bit of modification others none, it just depends on what functionality is required.

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Follow Up By: Member - Boobook - Monday, Aug 15, 2011 at 16:13

Monday, Aug 15, 2011 at 16:13
Fair cop Alan!

Thanks for taking the time to answer and sharing your thoughts.
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Follow Up By: Pete Jackman (SA) - Monday, Aug 15, 2011 at 22:56

Monday, Aug 15, 2011 at 22:56
I have a Jenal SC2 which I have been using on my heritage listed 8525 for the last 18 months - it is a great unit and I can recend the microphone (and the radio!)

Alan was very helpful when I was setting it up.


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Follow Up By: Member - John (Vic) - Monday, Aug 15, 2011 at 23:16

Monday, Aug 15, 2011 at 23:16
Good reply, thanks Alan.

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Reply By: rclaty - Monday, Aug 15, 2011 at 17:24

Monday, Aug 15, 2011 at 17:24
There is an application called ToneTool that can run under the Java App on your Android phone. I've never tried it as a selcall generator. The website is I think the best way to run it would be to install it(copy the .jad file) on to your sd card and then use the java app to run it.

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Reply By: snailbait (Blue mntns) - Monday, Aug 15, 2011 at 19:54

Monday, Aug 15, 2011 at 19:54
HI Guys
Dont Stress about contacting the RFDS for emergency just join the HF RAFIO CLUB with you HF radio with this radio you can contact the RFDS through the telephone

Life MEMBER snailbait Oberon HF RADIO CLUB VKE237 mobile 7661

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