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Chinese Filters on eBay

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AL7CR

Chinese Filters on eBay

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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Petr, OK1RP/M0SIS

Re: Chinese Filters on eBay

Hi,

http://elecraft.365791.n2.nabble.com/IF-Crystal-filters-on-eBay-td7623489.html

http://www.ebay.com/itm/250Hz-CW-Crystal-Filter-for-Elecraft-K3-with-8-crystals/201694670061?_trksid=p2047675.c100010.m2109&_trkparms=aid%3D555012%26algo%3DPW.MBE%26ao%3D2%26asc%3D39007%26meid%3D95e7b876ede4444faca007d53c5e8eb0%26pid%3D100010%26rk%3D3%26rkt%3D6%26sd%3D172338045381

Even although I did not measured them or even touched I am not recommending to purchase these filters. Even the soldering quality is giving a hint about the overall quality. You do not know anything about the used xtal's cuts, their parameters, matching in filter etc. The QC will be zero (as always in Chinese junks), return postage is higher than price itself. It is "ex-gratia problem" purchase...

My 2c add...

73 - Petr, OK1RP

73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
MeWe: https://bit.ly/2HGPoDx
MeWe: https://bit.ly/2FmwvDt

Michael Walker

Re: Chinese Filters on eBay

If are willing to invest $50, then go ahead. He does have a return policy.

Next, I would buy, beg, borrow a VNA and sweep them. That is the only way
to be sure. It is hard to read his scans/sweeps. They Q factor looks a
little soft, but usable.

If the soldering is poor, that is an easy fix. Just redo them.

I'm sure they will work ok. They won't do any damage to your radio. But,
you normally do get what you pay for.

Mike va3mw

On Wed, Nov 2, 2016 at 1:12 PM, Petr, OK1RP/M0SIS <[hidden email]>
wrote:

> Hi,
>
> http://elecraft.365791.n2.nabble.com/IF-Crystal-filters-
> on-eBay-td7623489.html
>
> http://www.ebay.com/itm/250Hz-CW-Crystal-Filter-for-
> Elecraft-K3-with-8-crystals/201694670061?_trksid=p2047675.
> c100010.m2109&_trkparms=aid%3D555012%26algo%3DPW.MBE%26ao%
> 3D2%26asc%3D39007%26meid%3D95e7b876ede4444faca007d53c5e
> 8eb0%26pid%3D100010%26rk%3D3%26rkt%3D6%26sd%3D172338045381
>
> Even although I did not measured them or even touched I am not recommending
> to purchase these filters. Even the soldering quality is giving a hint
> about
> the overall quality. You do not know anything about the used xtal's cuts,
> their parameters, matching in filter etc. The QC will be zero (as always in
> Chinese junks), return postage is higher than price itself. It is
> "ex-gratia
> problem" purchase...
>
> My 2c add...
>
> 73 - Petr, OK1RP
>
>
>
> -----
> http://ok1rp.blogspot.com
> --
> View this message in context: http://elecraft.365791.n2.
> nabble.com/Chinese-Filters-on-eBay-tp7623774p7623775.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
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>

wayne burdick

Re: Chinese Filters on eBay

Administrator

In reply to this post by Petr, OK1RP/M0SIS

Hi Petr,

We go to great lengths to ensure performance of our K3/K3S crystal filters. First we 100% screen the crystals, testing them individually for electrical and physical IMD, activity level, Q, and center frequency. We then burn in, test and screen the finished filters. Finally, we label them clearly with the offset parameters required to set up the firmware. Lacking this final step, you could have filters that are not correctly centered. We also provide matched-frequency filters on request.

At the prices shown for these unauthorized knock-offs, you couldn't even buy the high-quality crystals themselves, much less put together and properly test the filters.

Caveat emptor.

Wayne
N6KR

On Nov 2, 2016, at 10:12 AM, "Petr, OK1RP/M0SIS" <[hidden email]> wrote:

> Even although I did not measured them or even touched I am not recommending
> to purchase these filters. Even the soldering quality is giving a hint about
> the overall quality. You do not know anything about the used xtal's cuts,
> their parameters, matching in filter etc. The QC will be zero (as always in
> Chinese junks), return postage is higher than price itself. It is "ex-gratia
> problem" purchase...
>
> My 2c add...
>
> 73 - Petr, OK1RP

wayne burdick

Re: Chinese Filters on eBay

Administrator

In reply to this post by Michael Walker

FYI: You can't screen crystals just with a VNA. And it isn't just about Q.

Crystals have physical IMD properties that are highly dependent on signal injection level. We have to screen the crystals over a range of signal levels individually, first, then again when they're assembled into a filter. The crystals also have to be burned in, or they can rapidly age when installed in the radio and develop undesirable properties down the road. There can be issues with electrodes, dust, etc., unless the crystal manufacturer is held to a high standard.

73,
Wayne
N6KR

On Nov 2, 2016, at 10:43 AM, Michael Walker <[hidden email]> wrote:

> If are willing to invest $50, then go ahead. He does have a return policy.
>
> Next, I would buy, beg, borrow a VNA and sweep them. That is the only way
> to be sure. It is hard to read his scans/sweeps. They Q factor looks a
> little soft, but usable.
>
> If the soldering is poor, that is an easy fix. Just redo them.
>
> I'm sure they will work ok. They won't do any damage to your radio. But,
> you normally do get what you pay for.
>
> Mike va3mw

Frank Krozel

Re: Chinese Filters on eBay

Ya, I would not want to invest that much money in an Elecraft and take a gunshot approach with accessories.

I pay for what I get.

And… I have some exceptional Elecraft equipment on the desk, in the shack, in the go-bag and one currently at Don’s place.
I always take the approach to buy what I can afford but sometimes… I do spend more to get something exceptional.
Wayne, Eric, Don, thanks for all your help over the years and for building exceptional equipment, as well as exceptional support.

Frank KG9H

> On Nov 2, 2016, at 2:22 PM, Wayne Burdick <[hidden email]> wrote:
>
> FYI: You can't screen crystals just with a VNA. And it isn't just about Q.
>
> Crystals have physical IMD properties that are highly dependent on signal injection level. We have to screen the crystals over a range of signal levels individually, first, then again when they're assembled into a filter. The crystals also have to be burned in, or they can rapidly age when installed in the radio and develop undesirable properties down the road. There can be issues with electrodes, dust, etc., unless the crystal manufacturer is held to a high standard.
>
> 73,
> Wayne
> N6KR
>
>
> On Nov 2, 2016, at 10:43 AM, Michael Walker <[hidden email]> wrote:
>
>> If are willing to invest $50, then go ahead. He does have a return policy.
>>
>> Next, I would buy, beg, borrow a VNA and sweep them. That is the only way
>> to be sure. It is hard to read his scans/sweeps. They Q factor looks a
>> little soft, but usable.
>>
>> If the soldering is poor, that is an easy fix. Just redo them.
>>
>> I'm sure they will work ok. They won't do any damage to your radio. But,
>> you normally do get what you pay for.
>>
>> Mike va3mw
>
>
>
> ______________________________________________________________
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Ken G Kopp

Re: Chinese Filters on eBay

In reply to this post by AL7CR

Two old sayings come to mind ....

'A fool and his money are soon parted" and "Ya gets what ya pays for"....

73

K0PP
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Jim Rhodes-3

Re: Chinese Filters on eBay

In reply to this post by AL7CR

Someone on the list here posted a few weeks ago advising not to bother. It
seems he did buy one and was not pleased with the product at all.

On Wed, Nov 2, 2016 at 11:44 AM, AL7CR <[hidden email]> 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.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Phil Wheeler-2

Re: Chinese Filters on eBay

In reply to this post by AL7CR

Yes, from Oct 18; perhaps this is it:

-----

Hi,

beware of purchasing the IF Crystal filters on eBay...

http://www.ebay.com/itm/500Hz-CW-Crystal-Filter-for-Elecraft-K3-with-8-crystals-/172338045381?hash=item282025e1c5:g:u4MAAOSwGtRX1PVT

http://www.ebay.com/itm/250Hz-CW-Crystal-Filter-for-Elecraft-K3-with-8-crystals/201666313563?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D37115%26meid%3D7da2954521644b4dbfd000bf3e4f9fdd%26pid%3D100005%26rk%3D1%26rkt%3D6%26sd%3D172338045381

...unbelievable. Even the soldering quality, used headers, etc. are giving
an illustration about this product clone itself so be careful.

73 - Petr, OK1RP

-------
On 11/2/16 1:06 PM, Jim Rhodes wrote:

> Someone on the list here posted a few weeks ago advising not to bother. It
> seems he did buy one and was not pleased with the product at all.
>
> On Wed, Nov 2, 2016 at 11:44 AM, AL7CR<[hidden email]> 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.
>> ______________________________________________________________
>> Elecraft mailing list
>> Home:http://mailman.qth.net/mailman/listinfo/elecraft
>> Help:http://mailman.qth.net/mmfaq.htm
>> Post:mailto:[hidden email]
>>
>> This list hosted by:http://www.qsl.net
>> Please help support this email list:http://www.qsl.net/donate.html
>> Message delivered [hidden email]
>>
> ______________________________________________________________
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>

bdenley

Re: Chinese Filters on eBay

How's the performance? Anyone try one?

Brian
KB1VBF
Sent from my iPad

> On Nov 2, 2016, at 4:24 PM, Phil Wheeler <[hidden email]> wrote:
>
>
> Yes, from Oct 18; perhaps this is it:
>
> -----
>
> Hi,
>
> beware of purchasing the IF Crystal filters on eBay...
>
> http://www.ebay.com/itm/500Hz-CW-Crystal-Filter-for-Elecraft-K3-with-8-crystals-/172338045381?hash=item282025e1c5:g:u4MAAOSwGtRX1PVT
>
> http://www.ebay.com/itm/250Hz-CW-Crystal-Filter-for-Elecraft-K3-with-8-crystals/201666313563?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D37115%26meid%3D7da2954521644b4dbfd000bf3e4f9fdd%26pid%3D100005%26rk%3D1%26rkt%3D6%26sd%3D172338045381
>
> ...unbelievable. Even the soldering quality, used headers, etc. are giving
> an illustration about this product clone itself so be careful.
>
> 73 - Petr, OK1RP
>
> -------
>> On 11/2/16 1:06 PM, Jim Rhodes wrote:
>> Someone on the list here posted a few weeks ago advising not to bother. It
>> seems he did buy one and was not pleased with the product at all.
>>
>>> On Wed, Nov 2, 2016 at 11:44 AM, AL7CR<[hidden email]> 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.
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home:http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help:http://mailman.qth.net/mmfaq.htm
>>> Post:mailto:[hidden email]
>>>
>>> This list hosted by:http://www.qsl.net
>>> Please help support this email list:http://www.qsl.net/donate.html
>>> Message delivered [hidden email]
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home:http://mailman.qth.net/mailman/listinfo/elecraft
>> Help:http://mailman.qth.net/mmfaq.htm
>> Post:mailto:[hidden email]
>>
>> This list hosted by:http://www.qsl.net
>> Please help support this email list:http://www.qsl.net/donate.html
>> Message delivered [hidden email]
>>
>
> ______________________________________________________________
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alorona

Re: Chinese Filters on eBay

In reply to this post by wayne burdick

When purchasing a used K3, remember to ask, "Are the filters genuine Elecraft?"

Al W6LX
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Petr, OK1RP/M0SIS

Re: Chinese Filters on eBay

This post was updated on .

In reply to this post by Phil Wheeler-2

Hi all,

so again:

1. I never bought these filters from China on eBay!
2. I just found them on eBay and I was disgusted a few weeks ago so I posted the warning message to others over here on the list in order to not waste their money as I am pretty sure these filters are poor quality!
3. As I mentioned today again I never spend single cent for junks on eBay like these filters. I do not want to degrade my top quality K3 by chinese knock-offs!
4. Please read carefully the post from Wayne, N6KR as he mentioned all what I meant perfectly.
5. I am recommending to buying for K3/K3S only genuine filters from Elecraft or Inrad!

THANK YOU WAYNE FOR YOUR BRILIANT EXPLANATION.

Hope that people will understand it.

73 - Petr, OK1RP

73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
MeWe: https://bit.ly/2HGPoDx
MeWe: https://bit.ly/2FmwvDt

k6dgw

Re: Chinese Filters on eBay

In reply to this post by AL7CR

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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Michael Walker

Re: Chinese Filters on eBay

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 <[hidden email]> 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.
>>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Nr4c

Re: Chinese Filters on eBay

In reply to this post by alorona

"Pop the top"!

Sent from my iPhone
...nr4c. bill

> On Nov 2, 2016, at 5:39 PM, Al Lorona <[hidden email]> wrote:
>
> When purchasing a used K3, remember to ask, "Are the filters genuine Elecraft?"
>
> Al W6LX
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Cliff Frescura

Re: Chinese Filters on eBay

"Elecraft Inside!", to borrow Intel's old line.

But seriously, people just spent circa $3K-$4K USD (new) on a high
performance radio and then go this route on a fairly critical component?

On one hand, it's a tribute to Elecraft's success and popularity, on the
other it can be a support nightmare. Can counterfeit versions be that far
off?

73,

Cliff K3LL/6

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Nr4c
Sent: Wednesday, November 02, 2016 8:36 PM
To: Al Lorona
Cc: [hidden email]
Subject: Re: [Elecraft] Chinese Filters on eBay

"Pop the top"!

Sent from my iPhone
...nr4c. bill

> On Nov 2, 2016, at 5:39 PM, Al Lorona <[hidden email]> wrote:
>
> When purchasing a used K3, remember to ask, "Are the filters genuine
Elecraft?"

>
> Al W6LX
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]

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Mark Goldberg

Re: Chinese Filters on eBay

In reply to this post by Michael Walker

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" <[hidden email]> 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 <[hidden email]> 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.
> >>
> >
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]
> >
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Mark Goldberg

Re: Chinese Filters on eBay

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" <[hidden email]> 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" <[hidden email]> 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 <[hidden email]> 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.
>> >>
>> >
>> > ______________________________________________________________
>> > Elecraft mailing list
>> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> > Help: http://mailman.qth.net/mmfaq.htm
>> > Post: mailto:[hidden email]
>> >
>> > This list hosted by: http://www.qsl.net
>> > Please help support this email list: http://www.qsl.net/donate.html
>> > Message delivered to [hidden email]
>> >
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
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>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
>

Elecraft mailing list

Re: Chinese Filters on eBay

Thanks, excellent work!

73 from David GM4JJJ

> On 3 Nov 2016, at 16:08, Mark Goldberg <[hidden email]> 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" <[hidden email]> 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" <[hidden email]> 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 <[hidden email]> 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.
>>>>>
>>>>
>>>> ______________________________________________________________
>>>> Elecraft mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:[hidden email]
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> Message delivered to [hidden email]
>>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>>>
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]