[Yaesu] Re: Problems with Yaesu customer service

Sun, 23 Mar 2003 14:12:29 -0500

Hi, Not sure how this supurious output may compare w/ other mod/mfr radios, but
this sounds like a design issue; Either the TX Eanble is not being inhibited
long enough as the PLL switches from rx>tx. Or perhaps the leading edge(the
"knee step") of the TX Enable voltage to the PA is coming "up" too fast. Try
adding some R/C filtering on the TX En or TX Gain/Lvl control line(s) for the PA
module.This may slow dwn the ramp-up of the TX signal enough to clean things up.
Ive seen similar conditions in a couple of radio products that Ive helped to
design.

73s    Steve    DE  WA1YKL

Fern Rivard wrote:

> >
> >Our club, the Central Pennsylvania Repeater Association, Inc. owns two
> >FT1500M xcvrs. One is used for APRS and the other for our IRLP node. Both
> >are less than a year old.
> >
> >The FT1500M used for APRS was kerchunking repeaters with packet bursts for
> a
> >30 mile radius when it was tracked down to our APRS node.
> >
> >The radio was swapped out with another brand and brought to my shop.
> Viewing
> >it's output on an HP-8920 analyzer found that on the "initial key up" it
> had
> >spurs almost as strong as the desired frequency across a wide portion of
> the
> >VHF spectrum. It is not necessary to have a TNC connected to the ACC port
> to
> >produce the problem. Just keying the microphone in a rhythm like a TNC will
> >produce the problem.
> >
> >It is still under warranty so I sent it to the CA Yaesu facility in the
> >beginning of January 2003. I explained the problem and they sent it back
> >stating in writing that "There is nothing wrong with the radio." In fact, I
> >had my spectrum analyzer set too wide and I should narrow it down to 25kHz.
> >:)
> >
> >I put the radio back on the HP-8920 and the spurs were still there. I video
> >taped the screen changing the span out to 10MHz showing that the radio is
> >indeed spurious. Packed up the radio and sent it back again.
> >
> >This time there was no saying they could not witness the problem. However,
> >it is still not resolved and after almost 3 months we are still without the
> >radio.
> >
> >At this point I decided to look at the other FT1500M that we use for our
> >IRLP node. It too exhibits the same spurious output on initial key up.
> >
> >Other club members that own FT1500M models brought them to club meetings
> and
> >every one of them tested spurious.
> >
> >Yaesu tells me they are waiting for Japan to make a decision.
> >
> >I would not be writing this if Yaesu service would have resolved this
> >problem in a timely manner. And yes, I too have called the main switchboard
> >number, got the recording, pressed zero and waited 3 or more minutes on MY
> >nickel and no one picked up.
> >
> >73
> >
> >Bob, W3PT
> >
> >
> >
> >Moderator: Ray Brown, KB�STN
> >_______________________________________________
> >Yaesu mailing list
> >[email protected]
> >http://mailman.qth.net/mailman/listinfo/yaesu
> >
>
> Moderator: Ray Brown, KB�STN
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