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Icom IC-746 Pro hook-up
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Hi Greg,
746 pro being a modern transceiver, you wouldn't need a box like ARB-704 as the voltages involved are safe and compatible. interfacing with your radio and Palstar LA-1K, there are two ways to do it. 1) connect the "SEND" & "ALC" ports on the back of the radio to the amplifier's "PTT" & "ALC" using RCA cables. - you would need to manually change the bands or set to use "RF Sensing" feature so that amplifier will detect upon transmit and set itself for use. 2) You can connect ACC-2 from the back of your radio to the LA-1K's radio interface (ICOM/Yaesu) port - A supported cable would be Ameritron DB-7DI. ?This cable would help the amplifier understand the band you have selected on the radio and make itself ready for transmission, without having to manually modify the band selection on the amplifier side or let amplifier do the job of understanding the frequency on transmit and make it do the hard work(if set for auto sensing) - ?Please set amplifier for band data cable use using the menu. The cable also provides the keying for the amplifier when you press PTT and also ALC feedback. ?Using band data cable doesn't set amplifier in transmit/operate mode automatically(for most bands) when you change bands - it will go into standby - you will have to tap Operate on touch panel. ?- #2 is how I use and feels safer than #1 The band data cable is not included with the amp - RCA cables also not included if I am not mistaken. But I am sure you have a pair lying around in your shack :) you can find the band data cable from following sellers. Kindly double check and please consider my 2 cents worth above as just pointers and confirm with other sources also as I hate to be remembered for wrong reasons - hehe! if you need any more info, please feel free to ask. 73 Hari |
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Sorry to wake up and old thread.? Thank you for the detailed write up and explanation.? I recently purchased a Palstar LA-1K amplifier and absolutely love the operation of it.? I have installed the band data cable from the IC-7300 to the amplifier.? Direct keying is the way to go for sure with TX delay set to 15ms.? My inquiry is, I am not sure that there is ALC feedback between the amp and the rig.? I see that it is stated in the reply that ALC feedback is supported through the band data cable.? I see ALC feedback is supported from the IC-7300 through ACC2 pin 5, but I don't see ALC supported in the pinouts for the 9 pin radio interface.? Looking for confirmation as to whether the ALC cable is required between the radio and the amplifier.
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Not needed with SS LDMOS amps. On Sun, Dec 4, 2022, 19:05 Richard Osborne <ripcord203@...> wrote: Sorry to wake up and old thread.? Thank you for the detailed write up and explanation.? I recently purchased a Palstar LA-1K amplifier and absolutely love the operation of it.? I have installed the band data cable from the IC-7300 to the amplifier.? Direct keying is the way to go for sure with TX delay set to 15ms.? My inquiry is, I am not sure that there is ALC feedback between the amp and the rig.? I see that it is stated in the reply that ALC feedback is supported through the band data cable.? I see ALC feedback is supported from the IC-7300 through ACC2 pin 5, but I don't see ALC supported in the pinouts for the 9 pin radio interface.? Looking for confirmation as to whether the ALC cable is required between the radio and the amplifier. |
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I've never depended on (or used) ALC with this amplifier.? Much better just to limit the output of the exciter output to 40-50 watts.? Leaving the radio at full output and depending on ALC to limit output will always result in buckshot since there is a time delay between hitting the ALC threshold and the actual feedback which limits the radio's output.? It's not necessary to connect the ALC at all either through the band data cable or the stand-alone ALC connector.?
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Dennis N0SP On 12/4/2022 at 6:03 PM, "Jerry Webb" <jerrywebb45@...> wrote:
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开云体育Thanks Dennis. I have received replies from a few hams with the same info. Good to know and also, that was the practice that I was following. I plan not to drive with anymore than 45 watts as that is giving me 1100w output. ?I am happy with that performance. Thanks to all that replied, you have been most helpful as I learn the ins and outs of this amplifier.Richard Osborne? VE3OZW |
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Hi Richard... ? I have two of them and really like them.? Never thought I'd go to solid state amps, always had tubes since I never liked the behavior of FET amps.? This LDMOS implementation by Palstar is excellent.? The only thing to keep in mind, which you evidently already know, is not to over drive them.? LDMOS amps get dirty quickly when over-driven, but they're cleaner than FET amps when excited within their ratings. Good luck with it! Dennis On 12/5/2022 at 8:05 AM, "Richard Osborne" <ripcord203@...> wrote:
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