Icom Japan's position is that their engineers are all fully occupied on new
designs.
When the problem was first discovered -- back in 1996 -- Icom America
retrofitted some additional VFO shielding, which eliminated the transmit
spur on the lower bands. Lacking a spectrum analyzer, I didn't discover that
this fix was ineffective on 15m and above till a few months ago. With a 1500
watt amplifier and a 1khz split on 12m, locals reported my spur on the DX
frequency at S9; so much for that pileup. The spur can be avoided by using
XIT instead of split; QRO CW ops using 775s in high band pileups should keep
this in mind.
73,
Dave, AA6YQ
> -----Original Message-----
> From: Tom Rauch [mailto:w8ji@contesting.com]
> Sent: Thursday, June 03, 1999 10:26 AM
> To: Dave, AA6YQ
> Cc: 'amps'
> Subject: RE: [AMPS] IMD & Phase noise
>
>
> From: "Dave, AA6YQ" <dhb@mediaone.net>
> To: <W8JI@contesting.com>
> Copies to: "'amps'" <amps@contesting.com>
> Subject: RE: [AMPS] IMD & Phase noise
> Date sent: Wed, 2 Jun 1999 22:29:43 -0400
>
> >
> > Regarding the 775's spur: Icom America recently gave me a full
> refund on a
> > 3.5 year old 775 after admitting that they could not (or would not)
> > correct this problem without disabling QSK above 20 wpm. I'd have rather
> > they fixed the problem, but a refund is far better than nothing.
>
> I'd wager the problem could be corrected with less than a day's
> work, unless they have laid out the VCO's in a postion where it is
> impossible to decouple them.
>
> Hopefully we won't see dozens of these rigs in use by loud stations
> working close-split DX!
> 73, Tom W8JI
> w8ji@contesting.com
>
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