Nokia Dolphin amps (70cms) and Ionica PA/RX 9cms

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M0DTS
Posts: 406
Joined: Sun Feb 24, 2008 9:03 pm

Re: Nokia Dolphin amps (70cms) and Ionica PA/RX 9cms

Post by M0DTS » Fri Jan 31, 2020 9:14 am

Well spotted, that was on my 'to do' list maybe 10 years ago!
I've updated with the images i had saved, i have not opened the amp up for many years now!

Rob

G8PEF
Posts: 168
Joined: Mon Oct 30, 2017 6:42 pm

Re: Nokia Dolphin amps (70cms) and Ionica PA/RX 9cms

Post by G8PEF » Sat Feb 01, 2020 12:37 pm

Has anyone tried operating these amplifiers at 24V? Were your attempts successful/useful/encouraging enough to pursue?

Ideally, I'd like to be able to operate one of these from the back of the car, and 24V is much easier to organise than 28V...
Clearly, it might limit the output power available, but will it have any adverse facts other than that?
Also, do you think that it would /require/ other modifications, or do you think it could be swapped freely between 28V and 24V, allowing swapping between home/vehicle at will?

John
G8PEF

radiogareth
Posts: 392
Joined: Wed Jan 06, 2016 9:46 am

Re: Nokia Dolphin amps (70cms) and Ionica PA/RX 9cms

Post by radiogareth » Sun Feb 02, 2020 7:42 am

As you are only needing say 150-200W of DC input you could try one of these: https://www.ebay.co.uk/itm/DC-DC-Conver ... 2749.l2649
There are some very beefy ones avaiable too for not much money and although I am yet to use one for my Dolphin I have had one running at 10 amps in (12 volts) and 90 volts out. Just be wary of 'Chinese ratings'......
https://www.ebay.co.uk/itm/DC-DC-Conver ... 2749.l2649
Gareth

M0DTS
Posts: 406
Joined: Sun Feb 24, 2008 9:03 pm

Re: Nokia Dolphin amps (70cms) and Ionica PA/RX 9cms

Post by M0DTS » Sun Feb 02, 2020 9:08 am

Works fine on 24V but just with reduced output power.
No odd effects noticed in about 8 years!

Rob

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