[Premium-Rx] WJ-8711A Main Tuning Encoder

[fintronics]

Ok, I opened up both 8711a's and did a little research.......

Oddly enough, both steel shaft and plastic shaft encoders have the same
mfg's part number. (HRPG-ASCA#19F) mfg by Broadcom (Agilent?). Mouser has
them listed as non-stocked with a 14 week lead time. Digikey lists them as
a minimum qty 50 order.

On my 8711a with the steel shaft encoder, there is a small tantalum cap
soldered across two of the 5 pins on the back of the encoder. (noise
reduction?) I removed the knob (two small hex head screws) and there is a
compression washer on the shaft. I put the knob back on pushing against the
compression washer while I tightened the set screws and no more wobble...
great... . On my other 8711a with the plastic shaft encoder, I'm thinking I
might be able to drill and tap two holes in the knob and add two set screws
like on the other knob, add a compression washer and wah-la!.. another fix.
Of course it would be best to find new replacements but that's not looking
too promising right now. We'll see....

There's an E-bay seller that from Israel that has four used one's (steel
shaft) listed for $145 (ouch!) but used??...

I haven't examined the data sheet to see what the part number suffix "19F"
means but maybe a substitute is possible....



On Tue, May 7, 2019 at 8:55 AM Gore, Greg <ggore at hmsracing.com> wrote:

> Glenn,
>
> Which encoder do you have, plastic shaft or metal shaft? The plastic shaft
> encoders were subject to wear if they weren't lubricated periodically which
> resulted in a really sloppy fit. I have one here that was so bad the tuning
> knob rubbed hard on the front panel and wore through the paint. There was a
> service bulletin which explained the reason for plastic shaft encoders was
> to correct a noise issue. As far as I know the plastic shaft encoders were
> special parts and are no longer obtainable except from another receiver.
> The original metal shaft encoders are still available. Tuning knobs are
> different for each type, plastic shaft used a push on type mounting with a
> flat side while the metal shaft knobs used round with set screws.
>
> Greg;
> WA1KBQ
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
>
>
> -------- Original message --------
> From: fintronics <fintronicsusa at gmail.com>
> Date: 5/7/19 7:50 AM (GMT-05:00)
> To: premium-rx at mailman.qth.net
> Subject: [Premium-Rx] WJ-8711A Main Tuning Encoder
>
> Hello;
>
> This has probably been covered before but I can't seem to find it in the
> archives.
>
> I have a 8711A that has a slight wobble on the main tuning knob/encoder. I
> actually have two with the same condition as well as an 8718. It's by no
> means objectionable and you don't feel it when you're tuning around. Is
> there some way to tighten this up? Is it the encoder? front panel
> bushing?.. don't know.. I remember reading that there are different types
> of encoders for these but not sure the difference. If it is in fact the
> encoder, can it be re-built? Are there replacements available? (doubtful).
>
> Any help or suggestions would be greatly appreciated.
>
> Thank you.
>
> Glenn W2BX
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