Flex 3000 and AL811H
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Flex 3000 and AL811H Expand / Collapse
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Posted Saturday, June 12, 2010 10:27 AM
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Recently purchased the Flex 3000 and was needing suggestions on hooking up the Al 811H amp to it.

Been using the ARB704 box on the other rigs.

Thanks for the help

Terry 

Having fun with the Flex

Just bought a Flex 3000 in Dayton

Post #2801
Posted Saturday, June 26, 2010 10:11 PM
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I will be very interested in the answer to this post because I have the exact same amplifier and I am waiting on whether  I should purchase a 5000A or the 3000.  I also have a Palstar AT AUTO and I'm curious how they will play with either the Flex Radio 5000A or the 3000.

Conrad

Conrad K7QCZ

Post #2854
Posted Saturday, June 26, 2010 10:25 PM


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The ARB-704 will work fine with either the FLEX-5000 or the FLEX-3000 as they are essentially the same radio from a TX Relay control perspective.

The AL-811H has external ALC control, but FlexRadio's SDRs do not utilize an external ALC feedback mechanism, since they have much better RF output control that conventional transceivers. Refer to the FlexRadio Systems Software Defined Radios and External ALC for Exciter Drive Control KB article that explains this in more detail.


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Tim - W4TME
Post #2855
Posted Monday, November 1, 2010 10:31 PM
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Seeing as this is an old topic, I hope someone can answer my question here.

I am a prospective customer of the Flex 3000 rig. If I choose this rig I'd definitely be in the run for one of the AL811H amplifiers down the road.

How do you interface the radio to the Amp? Which connector on the radio do you use to trigger the transmit on the amplifier? Is it the TX out connector? Also, it looks like the external ALC control isn't needed. Does this mean that you simply don't need to bother with the ALC connector on the amp? Can you use one of these amps without using any external ALC control (I see that the Flex radios don't need the ALC control because of the way they were designed, but I want to be able to use this amp with the radio )

Thanks

73
AB3LS
Post #3335
Posted Wednesday, November 3, 2010 12:28 PM
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Hi,

You will find the Flex 3000 to be quite easy to interface with the AL-811H amplifier. No ALC connection is needed, however, as you would with any amplifier, check your grid current as you tune and load. The TX-Out jack on the back of the Flex 3000 is used to key the amplifier. The amp control relay in the Flex is fast (roughly 2.5 ms closing time) so all that is left to do is to check the time it takes for the amplifier T/R to make its transition so that you can set a delay time in PowerSDR to prevent hot-switching. As I recall I set my delay to 75ms and that keeps my Flex from transmitting briefly into infinity as the relay in the amplifier transitions from RX to TX. My Flex 5000 is connected to an AL-80B with no ALC line. The AL-80B does have the grid protection circuit installed, but it has never engaged while using my Flex. The RF power control with the Flex 5K and 3K is excellent. So, run your coax from the Flex into the amp, then from the amp to your antenna, then run the amp keying cable (RCA plug at both ends) from the TX-OUT jack on the Flex to the Relay jack on the amp, and you are done!

Rob W1AEX


[Flex 5000A]
Post #3338
Posted Monday, November 8, 2010 12:14 AM
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Hey thank you for the information!

I think I'm gonna take the big plunge and get a 5000A with all of the options (ATU, Dual RX, VHF/UHF Mod). It's a hefty price to pay... but it seems like with these rigs... you get what you pay for.

73
AB3LS
Post #3357
Posted Monday, November 8, 2010 3:32 PM
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I pondered that for quite a while, then decided that if I got the Flex 3000, I would love the whole SDR concept and end up selling it and buying a Flex 5000A anyway. To save time, I went for the 5K the first time around and have absolutely no regrets. It's a top shelf radio and more fun than any other modern rig I have ever owned.

Rob W1AEX


[Flex 5000A]
Post #3358
Posted Tuesday, August 21, 2012 10:04 AM
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Hi guys just wondering if anyone has had any issues running the flex 3000 direct to the Ameritron 811 or have you used the ARB 704 buffer, this seems to be a very grey area and i would like to know what the outcome is before i blow my brand new flex 3000 up lol

thanks for any replies appreciated


New Flex 3000 Owner and I love It:

Post #5954
Posted Tuesday, August 21, 2012 11:03 AM
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This is really not a gray area, I called Flex about this. They said that most amps except for some Heath Kit amps are fine with the Flex 3000 as it uses a much different tx circuit than the 5000. the 3000 uses a relay for tx and the 5000 is soft key that can be easily damaged by many amps. I use the 811 on my Flex 3000 with out a buffer, perfectly safe. But I suppose something can go wrong in the amp and send a large voltage spick, but other than that happening your good to go.
Post #5955
Posted Tuesday, August 21, 2012 12:52 PM
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Many thanks for the swift reply i guess im good to go, im enjoying the flex 3000 its a brilliant radio

New Flex 3000 Owner and I love It:

Post #5957
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