[Elecraft] Chinese Filters on eBay

[David Anderson]

Thanks, excellent work!

73 from David GM4JJJ

> On 3 Nov 2016, at 16:08, Mark Goldberg <marklgoldberg at gmail.com> wrote:
> 
> Here is the link. Forgot to add it at the end. Posting on a small screen
> will get you.
> 
> https://sites.google.com/site/markstcxomeasurements/
> 
> 73,
> 
> Mark
> W7MLG
> 
>> On Nov 3, 2016 8:43 AM, "Mark Goldberg" <marklgoldberg at gmail.com> wrote:
>> 
>> 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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>> 
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