[Elecraft] Chinese Filters on eBay

[Mark Goldberg]

Since you brought this up, I will post a link to my analysis of the
knockoff "TCXOs" for the Kenwoods. You do get what you pay for, and you
can't even buy good parts for what they charge.

The added phase noise of the Chinese parts increases the phase noise of the
TX by about 10 dB 15 kHz away. It also is full of spurs.

Basically, if you were on a DXpedition with 100W, you would splatter and
interfere like you had a kilowatt. By the way, the K3S with the new
synthesizer is even better in this regard. It is at least 20 dB lower which
would be more like if you had 1 W.

Only the good RX filters in the Kenwood radio prevent degradation in RMDR
on most bands. They basically made a really bad synthesizer, and made it
look like a TCXO. There is a lot more to it than just being on frequency

73,
W7MLG

On Nov 2, 2016 3:05 PM, "Michael Walker" <va3mw at portcredit.net> wrote:

> I bought a TCXO on ebay for  my TS480 (SO-3).  I installed it and then put
> the RF deck in the oven and then outside (it was winter).
>
> I went through the Alignment calibration to see how far it drifted.  I
> can't remember the exact number, but it was within limits in terms of PPM.
> Which was great, as my TS480 sits outside all winter on the remote base and
> that is as low as -30C at times.   It has been there for 7 years now (or
> more).
>
> For me, it was as test for $30 including shipping direct to my door.  It
> looked exactly like the SO-3 @ $135  plus shipping.
>
> So, before you declare the entire electronics world as poison, you do need
> to do your homework.
>
> Don't forget, this is an experimental hobby.
>
> Try Something....
>
> Mike va3mw
>
> On Wed, Nov 2, 2016 at 5:58 PM, Fred Jensen <k6dgw at foothill.net> wrote:
>
> > From my short experience with LiIon batteries from China ["Blue Bombs"],
> > I'd save up my bucks and get the real Elecraft filters.
> >
> > 73,
> >
> > Fred K6DGW
> > - Sparks NV DM09dn
> >
> > - Northern California Contest Club
> > - CU in the Cal QSO Party 7-8 Oct 2017
> > - www.cqp.org
> >
> > On 11/2/2016 9:44 AM, AL7CR wrote:
> >
> >> I am tempted to try one of the Chinese made filters listed for sale on
> >> Ebay.   Does anyone have any experience with using one?  I am
> >> considering the 1.8khz.
> >>
> >
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