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Author Topic: Non tuned input amp/ Solid state-rigs  (Read 439 times)
K3JVB
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« on: October 19, 2008, 06:40:43 AM »

Hello all

I am looking to buy a Ft-1000-d, and want to drive my Swan mk-2 with it.

I remember some doing this with just the Ft-1000's antenna tuner being used to match the amp/antenna swr.
Or would I be better off using an inductance type tuner in-between the rig and amp?
73
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AD4U
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« Reply #1 on: October 20, 2008, 11:03:04 AM »

I have never owned or used a Swan amp.  As I remember the input impedance of two 3-500 tubes is rather close to 50 ohms.  The matching range of the typical tube final Pi-Net of days gone by was at least a 2:1 SWR.  Assuming the built in tuner of your Yaesu can match a SWR of at least 3:1 (the built in tuner in my Kenwood TS 930S will do much better than that) you should be OK using it to match the impedance of your amp.

Dick  AD4U
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K3JVB
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« Reply #2 on: October 20, 2008, 02:37:23 PM »

Hi Dick
Thanks for the input. I was looking for an up grade to my Ft-767-gx. But wanted something That would play "well" with my FL-7000, (auto band switching)
But some have warned me the ft-1000, and the mp-mk
(200 watts versions) will have an rf spike. Even with the drive below 50 watts. This is turn, I am told will play havoc with the FL-7000.

So...If I want the 1000-d , I need to go another direction for an amp. I have a Swan station, and the mk-2 would be a candidate, as long as I can make the 1000-d work, with out the exiceter's power rolling back.

The other issue is keying it. But that should be a snap to figure out, along with another relay.
Anybody have any other pro's or con's
Thanks
73

I always wanted a nice Ft-1000-D with all the filters/ Well it looks like I may do it !
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WA8UEG
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« Reply #3 on: October 24, 2008, 07:32:12 AM »

I have no problem with my FT1000MP and the my Swan MK II. You will be fine as long as you have a good match to the antenna, if not you'll want a tuner between the amp and antenna.
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K9FON
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« Reply #4 on: October 26, 2008, 01:05:18 PM »

All i know is my Icom 746 will not tune into my Swan MK II. I think the internal tuner is not working on 80 meters for some oddball reason. Oh well, i use my trusty ol' Kenwood 830s with the amp and the rig loves it.
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KB1QYO
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« Reply #5 on: October 27, 2008, 06:29:03 PM »

I thought the input impedance changed with the rf cycle? Or am I not understanding it?
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