Maybe I am just unlucky but I have blown mine twice. First time I blamed
myself as I had an extended JT65 session
over several bands at full power. JT65 is about 40% duty cycle with 48
seconds out of each two minute period as
key down time. The SWR was very low on all bands (autotuned with and
AT-Auto) so while I do not
believe this type of operation should have ben an issue but I did take the
precaution of having DDUtil cut the power
back to 50% any time I go into a digital mode.
The second time, about six months later they failed sometime between the end
of a 160m rag chew session at 22W AM
driving my ACOM amp and an attempted 6m USB session, there was a two day
span where the radio was
powered but not in use. I believe it failed while sitting there so I have
not come up with a good explanation for
the second failure.
Both times I shipped it back to Flex and between shipping and repair this
"feature" has cost me close to
$600. I plan to stock the finals from here on out to avoid most of the cost
and the downtime should this happen
again.
73 de Bill ND0B
-----Original Message-----
From: Rich
Sent: Wednesday, October 17, 2012 12:06 PM
To: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Blown finals
that's so strange ,that you should have blown finales,, have done a lot
with Flex's
and have never heard of a blown finale .
but whatever the case ,, hope all goes well
"Rich"
On 10/17/2012 10:18 AM, Nige G7CNF wrote:
To any UK Flexer who might find themself in the same position, courtesy of
N1DL the F5K's finals are also used in the Icom IC-7000. The RD70HHF1's
were in stock @ £44ea. That's about middle of the road from the prices I
obtained but the only supplier to have them in stock.
Nige.
On 17/10/2012 14:42, Karl Geng wrote:
Just remembered the ICOM IC7000 uses the same MOSFETS in the final
try the UK ICOM guy.
Karl N1DL
On Oct 17, 2012, at 8:46 AM, Nige G7CNF <g7cnf.n...@gmail.com> wrote:
Cheers. Managed to confirm that. Now the trouble is I can't find any in
the UK - any help appreciated.
Nige.
On 17/10/2012 12:57, dan edwards wrote:
pair of rd70hhf's in push-pull, i THINK....73, w5xz
--- On *Wed, 10/17/12, Nige G7CNF /<g7cnf.n...@gmail.com>/* wrote:
From: Nige G7CNF <g7cnf.n...@gmail.com>
Subject: [Flexradio] Blown finals
To: flexradio@flex-radio.biz
Date: Wednesday, October 17, 2012, 11:54 AM
Hi guys.
Following an unexpected high SWR condition on 10m (@80w full
carrier), the PA failed to fold back for some reason and smoked
them. To save me the bother of opening the box prematurely, could
someone tell me which MOSFETs are used, please?
Regards,
Nige.
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