"You can lead horses to water, but you cannot make them
drink"-- This phrase seems to apply to the 817 group,
since many YEARS ago, I posted a FIX for this oscillation,
to eliminate blown finals, and enable safely leaving
batteries inside, or operation WITHOUT the need for any
"Ferrite Bead"!-All that is required is to disconnect the
miniature coax cable at the input to the final PA board,
and re-connect it afyer swapping shield and center
connector polarity at one end of the cable! NO parts or
adjustments needed! (Be SURE to remove batteries and other
power sources before doing this alteration, and be very
careful not to short or otherwise damage anything) You can
probably find details in the site archives, with photos!
All such oscillations should CEASE after the cable phasing
is reversed!-73, KC3VO
Sent from my
Verizon Wireless 4G LTE smartphone
-------- Original message --------
From: "'Robin Gape (lists)'
list@... [FT817]"
Date: 11/29/2016 5:34 PM (GMT-05:00)
To:
FT817@...
Subject: Re: [FT817] Tx oscillation on 432 MHz
Andrew, and anyone else who never had the documentation or
who lost it,
the original Yaesu note is available, scanned, for
information and fair use:
Hope you find this useful. The official manual notes the
presence of the
ferrite clamp, but fails to tell one what to do with it! The
supplied
split-core clamp is about 31mm long, and 15mm diameter. One
suspects
that any similar clamp will probably do the job.
73,
Robin, G8DQX
On 29/11/16 21:06,
andrew73@... [FT817] wrote:
> I don't have any filter - I am the third owner of this
radio and
> although I received it in the original packing box,
only the mike and
> antenna bits were included.? I can buy a snap-on
ferrite choke at an
> electronics shop and will try that.
>
> Thanks
>
> Andrew VK1DA/VK2UH
------------------------------------
Posted by: "Robin Gape (lists)"
------------------------------------
And for a great FAQ ( Frequently Asked Questions ) see
Some really good technical info at:
.
Please note that your messages and files sent to this group
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