CARrier control on Flex-6300

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  • Updated 1 year ago
Hi everyone,
I'm playing with my 6300 only since a few weeks and like it a lot. There's 1 item however that makes we wondering.

The Flex-6300 goes up to 95 Watt out on some bands but only to 85-90 on some others. Isn't there a button or slider somewhere to make sure the finals can produce the 100 Watt out they are supposed to?
I found nothing in the documentation. We OT's are used to having a carrier button on our transceivers.

73, good DX
Gust ON6KE

 
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Gust ON6KE

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Posted 1 year ago

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Steven G1XOW

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Hi Gust,

You might need to give 14.5 - 14.8v PSU input to get 100W out on all bands. There is a big volt drop on the power cable, connectors and internal fuses (even with the standard factory cable).

Also, check 100% power out can be achieved in to a good dummy load, using a quality external power meter...just to make sure you don't have antenna problem as the F6k high SWR back-off is a little too sensitive in my opinion.

73 de Steve G1XOW
(Edited)
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Gust ON6KE

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Hi Steve,
I hooked the 6300 to a 1kW wet dummy load, with and without the ATU in the circuit, I makes no difference power wise on any of the bands.

Next I measured the input Voltage before (13.70 V) and after (13.58 V) the fuse. That is a significant difference coming from an of course stabilised 13.8V source.

I can raise voltage to 14.5V or slightly higher but won't give it a try just now, got a lot hooked up to that power supply now. That extra half a Volt might very well make it a full 100 Watt transceiver.  :-)

Cheers
Gust ON6KE
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Steven G1XOW

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Gust,

There is another fuse internally as well. This means that when you add the series drop of the power-pole connectors, the cable, the external fuse, and internal fuse 13.8v only results in about 13.1-13.2V at the PA. You could also shorten the factory cable but that really should not have been necessary.

I run my PSU at 15Vdc (output at the PSU terminals) and all is fine for over 2 years now. The fan does get a little louder though.

73 de Steve G1XOW
(Edited)
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Gust ON6KE

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I forgot, so I understand there's is no such thing as a CARrier control on the 6300. Of course you don't need it if the end stages are sufficiently broad-banded impedance wise.

73
PS
They take just about everything away from you these SDR's..
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Ross - K9COX

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Just so there is no confusion SmartSDR does have sliders for RF power, Tune power, and AM carrier levels.
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Gust ON6KE

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Yes that I know Ross.

Thanks
73, good DX (in these difficult miserable conditions lately)

Gust ON6KE
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HCampbell WB4IVF

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Gust -

Your question comes up repeatedly for Flex and other manufacturers’ radios (I’ve seen it in Icom’s and ANAN’s FAQs).   

Check out this thread, and Flex’s official reply:

https://community.flexradio.com/flexradio/topics/6500-power

Howard

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Gust ON6KE

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Thank you very much Howard, your input is much appreciated.
Interesting URL.

73, good DX
Gust ON6KE