One for the Codan HF Gurus

Submitted: Friday, May 09, 2008 at 17:00
ThreadID: 57426 Views:5386 Replies:3 FollowUps:10
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I have a Codan 8528 which is one of the rare ones that allows programing from the front panel. I note the 27 MHz CB channels are programmed but won't allow Tx. I am aware that the low power option needs to be used to be legal on 27 MHz. My concern is I can program any frequency I want in up to a certain maximum but I can't program 27 MHz Tx frequencies. I get a "too high" response from the screen.

What do I need to do to program these. Do I need to first set the power to low with the jumper?

David O
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Reply By: Member - Footloose - Friday, May 09, 2008 at 17:54

Friday, May 09, 2008 at 17:54
David, what does it say it's eprom version is when you switch it off holding the off button ? Option E, D ??
Is the TXE short still on , in the micro ?
AnswerID: 302922

Follow Up By: David and Justine Olsen's 4WD Tag-Alongs - Friday, May 09, 2008 at 18:04

Friday, May 09, 2008 at 18:04
Footy

It says Tx- E Option

I haven;t had the set apart so I don;t know what jumpers are where but I assumed from the Tx-E and from my previous programming of other freq from front panel, that I should be able to program 27 MHz.

I attempted to edit the existing CB channels that have Tx Inhibit without success, then I tried new P Channels but neitehr worked. Both gave "too high" response.

David
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FollowupID: 569060

Follow Up By: Member - Footloose - Friday, May 09, 2008 at 18:37

Friday, May 09, 2008 at 18:37
I'd try it with the low power strap.
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Follow Up By: David and Justine Olsen's 4WD Tag-Alongs - Friday, May 09, 2008 at 18:46

Friday, May 09, 2008 at 18:46
Thanks Footy

I will give that a go in the morning

David
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FollowupID: 569073

Follow Up By: Stu & "Bob" - Friday, May 09, 2008 at 21:39

Friday, May 09, 2008 at 21:39
I have a 9323 TXE, and I cannot program CB channels in it either.

I believe there is a software override when programming via PC.
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Reply By: Skippy In The GU - Saturday, May 10, 2008 at 05:25

Saturday, May 10, 2008 at 05:25
If your using the old 8551 then that could be the problem, mine won't let me transmit anything about 16megs, you could use a long wire
AnswerID: 302993

Follow Up By: David and Justine Olsen's 4WD Tag-Alongs - Saturday, May 10, 2008 at 06:15

Saturday, May 10, 2008 at 06:15
Skippy
I don't have an autotune antenna. The problem is with the front panel programming, but you may have found the answer to the problem. I will have to go back and look through the manual. I wonder does the set have a setting to tell to look for an autotune like the Barrett 950 does and therefore won't allow Tx programming above 16 MHz?

David
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FollowupID: 569140

Reply By: Member - Mark E (VIC) - Saturday, May 10, 2008 at 09:23

Saturday, May 10, 2008 at 09:23
David,

The Tx-E option on the 8528 will allow access to the 99 P channels only, not access to the pre-programmed channels in the main part of the EPROM.

I don't know why it has been programmed for Rx only on the 27mHZ channels, but it is possible that the set does not have the low power strap fitted and the Tx on 27mHz was disabled to save the PA's.

To find what the low power strap looks like, go to ozradio 27mHz page Lots more Codan info on ozradio also.

If it is fitted, you may need to have the EPROM re-programmed by someone in the 'know' who is familiar with the various EPROM versions, with access to an EPROM burner and the 8528 software, if you really feel the need for 27mHz channels.

PM or email me direct if you would like any further info....or of course Footy can probably help being the HF/Codan guru :-)

Cheers,

Mark
AnswerID: 303010

Follow Up By: David and Justine Olsen's 4WD Tag-Alongs - Saturday, May 10, 2008 at 09:33

Saturday, May 10, 2008 at 09:33
My trials tell me you are of course correct on all of the above, but it doesn't explain why I can't program a P channel to 27 MHz.

From my recollection the PA's are fine at 11 metres but not at 10. If so then the programmed Tx disable would be more about legality. What I would like ideally is to have a switch on the side of the case to set low power rather than having to open the case. I would like the TX option on 27MHz.

David

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FollowupID: 569161

Follow Up By: Member - Mark E (VIC) - Saturday, May 10, 2008 at 12:56

Saturday, May 10, 2008 at 12:56
Firmware only allows Tx programming up to 26.5mHz (I think) in the P channels. Anything above that will trigger the 'too high' warning.

Even in the PC sofware, where the 27mHz channels are already programmed into the EPROM, they can be deleted, but not programmed. My bet is there is a 'factory version' of the programming software that will allow access to this.

Sounds like your best bet is to get someone to re-do the EPROM for you, unless your computer programming skills are up to deciphering the Codan firmware?

Cheers,

Mark
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FollowupID: 569177

Follow Up By: David and Justine Olsen's 4WD Tag-Alongs - Saturday, May 10, 2008 at 13:05

Saturday, May 10, 2008 at 13:05
I finally did the non-bloke thing and read the manual fully. Seems Tx only enabled in eprom up to 24 MHz unless amateur or CB eprom fitted. Rx to 30 MHz.

I will wait until I finish my F call then get Ham and CB burned at same time.

Cheers all
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FollowupID: 569179

Follow Up By: Member - Mark E (VIC) - Saturday, May 10, 2008 at 13:42

Saturday, May 10, 2008 at 13:42
Sounds like the plan!

I have had these sets with CB programmed on them for years and never used it. There's just noone on 27 mHz CB anymore. Besides, you can't transmit on AM CB without 'other' modifications...

Good luck with the amateur licence. Must get around to doing it myself one day.

Cheers,

Mark
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FollowupID: 569187

Follow Up By: David and Justine Olsen's 4WD Tag-Alongs - Saturday, May 10, 2008 at 13:51

Saturday, May 10, 2008 at 13:51
27MHz still has a core of DX chasers. I just spoke to Hawaii and mainland USA and Darwin this afternoon. We are at the bottom of the sunspot cycle but sporadic propagation occurs.
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FollowupID: 569190

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