Re: [Elecraft] Chinese Filters on eBay

[David Anderson via Elecraft]

Thanks, excellent work!

73 from David GM4JJJ

> On 3 Nov 2016, at 16:08, Mark Goldberg  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"  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"  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  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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Re: [Elecraft] Chinese Filters on eBay

[Mark Goldberg]

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"  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"  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  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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>> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> > Help: http://mailman.qth.net/mmfaq.htm
>> > Post: mailto:Elecraft@mailman.qth.net
>> >
>> > This list hosted by: http://www.qsl.net
>> > Please help support this email list: http://www.qsl.net/donate.html
>> > Message delivered to va...@portcredit.net
>> >
>> __
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>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to marklgoldb...@gmail.com
>>
>
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Re: [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"  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  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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> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Elecraft@mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to va...@portcredit.net
> >
> __
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>
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Re: [Elecraft] Chinese Filters on eBay

[Ron D'Eau Claire]

It's not always a simple "pop". If equipped with a KRX3 sub receiver, it
also involves disconnecting a bunch of cables and removing the KRX3
enclosure to see the main K3S filters, then opening the KRX3 enclosure
itself to see what filters the sub rx has. 

73, Ron AC7AC

-Original Message-
"Pop the top"!

Sent from my iPhone
...nr4c. bill


> On Nov 2, 2016, at 5:39 PM, Al Lorona  wrote:
> 
> When purchasing a used K3, remember to ask, "Are the filters genuine
Elecraft?"
> 
> Al  W6LX

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Re: [Elecraft] Chinese Filters on eBay

[Cliff Frescura]

"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:elecraft-boun...@mailman.qth.net] On Behalf Of Nr4c
Sent: Wednesday, November 02, 2016 8:36 PM
To: Al Lorona
Cc: elecraft@mailman.qth.net
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 <alor...@sbcglobal.net> wrote:
> 
> When purchasing a used K3, remember to ask, "Are the filters genuine
Elecraft?"
> 
> Al  W6LX
> __
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> n...@widomaker.com

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Re: [Elecraft] Chinese Filters on eBay

[Nr4c]

"Pop the top"!

Sent from my iPhone
...nr4c. bill


> On Nov 2, 2016, at 5:39 PM, Al Lorona  wrote:
> 
> When purchasing a used K3, remember to ask, "Are the filters genuine 
> Elecraft?"
> 
> Al  W6LX
> __
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Re: [Elecraft] Chinese Filters on eBay

[Ron D'Eau Claire]

What are you trying to accomplish by buying the new filter? If it is to help
avoid rx overload from a kilowatt next door, you might need one. Otherwise,
the DSP filters can do the job just fine. The ONLY reason to have the
crystal filters on receive is to strip any monster signals before they can
overload any subsequent circuits in the receiver, but the K3/K3S have
excellent dynamic range. 

73,Ron AC7AC

>> 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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Re: [Elecraft] Chinese Filters on eBay

[Michael Walker]

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  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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Re: [Elecraft] Chinese Filters on eBay

[Fred Jensen]

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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Re: [Elecraft] Chinese Filters on eBay

[Walter Underwood]

One of the fun things I got to help with at a summer job was an acceptance test 
of a filter for aircraft use. We bolted that poor little filter to a huge shake 
table, then checked the group delay under vibration. It did not pass.

There were some serious vacuum tubes powering the shake table “voice coil”.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Nov 2, 2016, at 12:22 PM, Wayne Burdick  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  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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Re: [Elecraft] Chinese Filters on eBay

[Petr, OK1RP/M0SIS]

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.

THANK YOU WAYNE FOR YOUR BRILIANT EXPLANATION.

Hope that people will understand it.

73 - Petr, OK1RP





-
http://ok1rp.blogspot.com
--
View this message in context: 
http://elecraft.365791.n2.nabble.com/Chinese-Filters-on-eBay-tp7623774p7623788.html
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Re: [Elecraft] Chinese Filters on eBay

[Al Lorona]

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

Al  W6LX
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Re: [Elecraft] Chinese Filters on eBay

[Brian Denley]

How's the performance?  Anyone try one?

Brian 
KB1VBF
Sent from my iPad

> On Nov 2, 2016, at 4:24 PM, Phil Wheeler  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.c15.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D37115%26meid%3D7da2954521644b4dbfd000bf3e4f9fdd%26pid%3D15%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  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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Re: [Elecraft] Chinese Filters on eBay

[Phil Wheeler]

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.c15.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D37115%26meid%3D7da2954521644b4dbfd000bf3e4f9fdd%26pid%3D15%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  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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Re: [Elecraft] Chinese Filters on eBay

[Jim Rhodes]

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  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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Re: [Elecraft] Chinese Filters on eBay

[Ken G Kopp]

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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Re: [Elecraft] Chinese Filters on eBay

[kg9hfr...@gmail.com]

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  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  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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Re: [Elecraft] Chinese Filters on eBay

[Wayne Burdick]

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  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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Re: [Elecraft] Chinese Filters on eBay

[Wayne Burdick]

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"  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




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Re: [Elecraft] Chinese Filters on eBay

[Michael Walker]

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 
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%3D95e7b876edefaca007d53c5e
> 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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Re: [Elecraft] Chinese Filters on eBay

[Petr, OK1RP/M0SIS]

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%3D95e7b876edefaca007d53c5e8eb0%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
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[Elecraft] Chinese Filters on eBay

[AL7CR]

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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