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Author Topic: Weighted VFO Knob in general  (Read 2157 times)
KD7RDZI2
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Posts: 217




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« on: May 06, 2017, 06:26:50 AM »

The Drake R8 that has a very light VFO Knob. I like it is light. Is there a mechanical reason why they chose a light one or just a mere reason of cost? Is there any cons for a heavier knob in rigs?
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W8JX
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« Reply #1 on: May 06, 2017, 07:52:43 AM »

The Drake R8 that has a very light VFO Knob. I like it is light. Is there a mechanical reason why they chose a light one or just a mere reason of cost? Is there any cons for a heavier knob in rigs?

You have to remember that VFO shaft and bearings/bushings have to support this weight. If you weight it with a mixture of lead shot and epoxy in hollow recess on back of knob to improve feel make sure to lube shaft and its bearings/bushings regularly.
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--------------------------------------
Ham since 1969....  Old School 20wpm REAL Extra Class..
WA3SKN
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« Reply #2 on: May 06, 2017, 02:37:35 PM »

If you like it, enjoy it!
73s.

-Mike.
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LUCYAJONES
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Posts: 16




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« Reply #3 on: October 10, 2017, 09:41:10 PM »

The Drake R8 that has a very light VFO Knob. I like it is light. Is there a mechanical reason why they chose a light one or just a mere reason of cost? Is there any cons for a heavier knob in rigs?
:)On the off chance that you like it, appreciate it!
-------------------------------------------------
lucya
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WB4SPT
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« Reply #4 on: October 11, 2017, 10:29:49 AM »

Weight/inertia tends to smooth the action, but the starting and stopping require more effort.
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N4MQ
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« Reply #5 on: October 11, 2017, 03:19:39 PM »

Would felt on the back of the knob not also provide the LOADING of the knob to simulate a heavier feel??  Old british cars had a friction mechanizim on the steering shaft to DAMP the steering FEEL. Woody
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KOP
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« Reply #6 on: October 12, 2017, 12:02:57 AM »

Would felt on the back of the knob not also provide the LOADING of the knob to simulate a heavier feel??  Old british cars had a friction mechanizim on the steering shaft to DAMP the steering FEEL. Woody

...also used those awful friction dampeners on the Triumph Spitfire.

     Friction is not at all the same as inertia. When you have a notoriously light (read frictionless) and precise VFO like the TS-830S there is an advantage to a weighted knob. I find there is less of an advantage when using one of the old Jackson reduction drives or the Swan/Siltronix duplex drives.
It seems this is exactly the opposite of many opinions. So we have a goodly portion that prefer weighted with the frictionless (usually optical) drives and those that prefer the weighted mechanical drive. A fair portion accept it as is and do nothing. Very few add friction on other than mobiles .  I put a little friction on my FT-857.
     It really is a matter of personal preference. The weighted knob for my TS-830S sits in a drawer. The knob I built for my Tempo 2020 is on the radio. The HW-101 and the Siltronix are as is . So I can't make up my mind either.
     Is that "general" enough for you ?

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October 02, 2017, 07:53:41 PM
K8AXW
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« Reply #7 on: October 13, 2017, 11:37:03 AM »

I encountered this same problem on a homebrew transceiver.  I spend countless hours "loading" the rear of the tuning knob with weight as well as using the felt option. I found that smooth leather washers worked better here.

The felt option gave me an unnatural drag which I didn't like. The leather washers was better. The weighted knob gave me a problem with the weight being in one spot.  When the knob was weighted at one spot and the knob was at the 1-3 o'clock positions (as well as 180 degrees from that) the knob would drift to the 6 o'clock position.

My final solution was to load the knob with equal amounts of weights at 3 or 4 positions on the back of the knob to give me the right feel with no drift as well as the option of "spinning the knob" when I wanted to.

Lead shot and a glue gun works fine for this mod. (I like glue from a glue gun because it can be peeled of if a change is necessary)
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