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Author Topic: Question about tuning the finals on a hybrid ...  (Read 345 times)

KD0VE

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Question about tuning the finals on a hybrid ...
« on: December 15, 2021, 06:30:00 PM »

Just got a recently acquired TS-830 working.  Very little experience tuning up tube finals.  Wondering what is the allowable change from the freq it was tuned at without retuning.

Example:  if tuned up at 14.25 is it good to 14.15 to 14.35?

thx to anyone taking the time to offer advice.

kd0zgw
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ZL1BBW

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Re: Question about tuning the finals on a hybrid ...
« Reply #1 on: December 15, 2021, 07:09:56 PM »

Probably reckon + or - 50kcs without having to repeak it, it should need a full retune just a touch up, try it into a dummy load and see how it goes, imn looking for a KWM2A or a SB102 but there arent many in NZ.  Gl enjoy.
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ex MN Radio Officer, Portishead Radio GKA, BT Radio Amateur Morse Tester.  Licensed as G3YCP ZL1DAB, now taken over my father (sk) call as ZL1BBW.

W0CKI

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Re: Question about tuning the finals on a hybrid ...
« Reply #2 on: December 15, 2021, 07:33:07 PM »

I have had several hybrids. In my case moving 25-35 up or down was never a problem. My antennas are resonant so that helps. Moving from the ssb to the cw portion always warranted a look and a re tune.
Hybrids can be very forgiving and will tolerate higher swr but be careful and don’t take unnecessary chances.
I love those old Kenwoods. Still a superior receiver with great tx and rx audio.
Gary, W0CKI
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W0CKI

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Re: Question about tuning the finals on a hybrid ...
« Reply #3 on: December 15, 2021, 07:36:48 PM »

One last thing, be sure you learn to tune it correctly. There’s plenty of YouTube info out there.
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N8YX

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Re: Question about tuning the finals on a hybrid ...
« Reply #4 on: December 16, 2021, 07:02:41 AM »

It also depends on the band.

10M is much less critical than, say, 160 or 80M. Peak the Drive (Preselector) control and you should be good to go for minor excursions.

Keep an eye on the iP meter relative to indicated power out. Kenwood states ~100w RF out should be obtained with 200-225mA iP. If your rig's output deviates markedly from this (higher iP/lower RF out) it's time to re-tune the PA tank. Use an accurate external wattmeter for monitoring.
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W0CKI

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Re: Question about tuning the finals on a hybrid ...
« Reply #5 on: December 16, 2021, 08:38:47 AM »

Load and dip, load and dip, dip and load, dip and load. A new concept for most new hams. Ya gotta learn it and what it means if you're gonna use a hybrid. Tubes are different!!
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