New RX888 Mk II for $90

[Rob Robinett]

I have had good results with other Aliexpress vendors and I couldn't resist this 50% off sale:

https://www.aliexpress.us/item/3256807172902214.html?spm=a2g0o.productlist.main.27.6aa4rQczrQczDQ&algo_pvid=d16c383c-2d00-4c3b-b197-8ab9fa49ce25&algo_exp_id=d16c383c-2d00-4c3b-b197-8ab9fa49ce25-13&pdp_npi=4%40dis%21USD%21180.58%2190.29%21%21%211307.58%21653.79%21%402103080b17210158960264408e3cf5%2112000040415704767%21sea%21US%21788778068%21X&curPageLogUid=Oa38uJidIWIz&utparam-url=scene%3Asearch%7Cquery_from%3A

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Rob Robinett

AI6VN

r...@robinett.us

mobile: +1 650 218 8896

[Tony Williamitis]

Rob,

Thanks for the heads-up.   A bought one as well.  

Tony Williamitis KB8MVP

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[ghby...@chartermi.net]

As did I.  It is quite a deal.  Remember, TAPR has the RX888 clock kit, thermal pad, and soon (tomorrow?) the HF RX-only isolation transformer module with a Mini-Circuits T1-1 on it.  If you buy both together, TAPR will ship them together, within the USA, using USPS Ground Advantage, for free.  Your order must only be for these parts to get this deal.

 

https://tapr.org/product/rx888-clock-kit-and-thermal-pad/

 

73

George K9TRV

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[Philip Gladstone]

Do note that this vendor has no feedback and is a very recent addition to the platform. I have found Aliexpress to be good about refunding my money when things don't work out. 

Philip

To view this discussion on the web visit https://groups.google.com/d/msgid/hamsci/CAMBFq5e9gJkAR0CJpBHq9rnkMHVupZhEheA4pcWM3ecnc8dDbA%40mail.gmail.com.

[Phil Erickson]

Hi all,

  Is there a software unit test documented somewhere for determining whether a RX888 is working correctly out of the box?  E.g. "run this, get this output, compare with this fixed file"?  It's hard to define a deterministic test when you're talking about RF sampling, but maybe something like terminate the input in 50 ohms and ensure power levels are no more than XXX ADC units, or something like that?

(trying to figure out how Philip Gladstone would know to return a unit, for example)

73

Phil W1PJE 

PS: George - if you can send another email when the TAPR HF isolation transformer is up on the web site, that would be great.

To view this discussion on the web visit https://groups.google.com/d/msgid/hamsci/CAMd_wWoTnEHDQ7fPtLwGEiJ0qy2W4qobpLmk3YHw-hfaB3bAew%40mail.gmail.com.

--

----
Phil Erickson
phil.e...@gmail.com

[ghby...@chartermi.net]

I will send a follow-up email, Phil.  Right now, it’s juggling flaming, running chainsaws, 20 week old puppy care, work, kitting for TAPR products, and a more than minor problem with my right ankle that is and will continue to slow things down a bit.  I can’t quite hobble as fast as I was previously, so far.

 

I think we fire up KA9Q-radio and see if things work.  If that works, add wsprdaemon to the mix.  Since the RX888 gets its inputs from ‘the ether’ (rf-wise), it would be hard to come up with a method of playing a standard signal into it, to observe the output and compare to a template, or some set of expected results or observations.

 

73

George K9TRV

 

From: ham...@googlegroups.com <ham...@googlegroups.com> On Behalf Of Phil Erickson
Sent: Monday, July 15, 2024 2:36 PM
To: ham...@googlegroups.com
Subject: Re: [HamSCI] New RX888 Mk II for $90

 

Hi all,

To view this discussion on the web visit https://groups.google.com/d/msgid/hamsci/CAAZaqEtOADh1-jy5_8svyZaFna4xpWW9qLs%3DCH3K_i1V-95aSg%40mail.gmail.com.

[Phil Erickson]

Hi George,

  Best wishes on all of that - we're a patient crowd.

  Relative to the 2nd paragraph, I think it would be useful for someone with a calibrated RF signal generator to feed -73 dBm (S9, nominally) into it and then test the I/Q bit stream amplitude to make sure the requisite number of bits are toggled.  Perhaps I'll try that if I get a working RX888 out of all of this (I've done it a few times before in different contexts).  Rinse and repeat with a 50 ohm terminator on the front end: are the right number of bits occupied?  

-73

Phil W1PJE

To view this discussion on the web visit https://groups.google.com/d/msgid/hamsci/007c01dad6e7%2445574e70%24d005eb50%24%40chartermi.net.

[David G. McGaw]

One thing we have thought to do for our systems is to have a known signal available.  Any CMOS oscillator, 5V or 3.3V, in the HF range (probably between 1 and 2 MHz, 1.8432MHz is a common frequency) with a series resistor to make it look like 50 ohms source can give a nice square wave harmonic comb (odd harmonics) of predictable level.

David N1HAC

To view this discussion on the web visit https://groups.google.com/d/msgid/hamsci/CAAZaqEvNJETREAT-F_YkwaCeih-2rhTR91%2BMDVQrtxaxsLo%3DSA%40mail.gmail.com.

[ghby...@chartermi.net]

And the HF-RX-ISO (HF receiver transformer isolator) is now in the TAPR store.  There are 14 units available, as the gun is fired…

 

73

George K9TRV

To view this discussion on the web visit https://groups.google.com/d/msgid/hamsci/001a01dad6b9%2422a54040%2467efc0c0%24%40chartermi.net.

[John Ackermann N8UR]

I ordered one this morning and just got an email saying it had shipped.
So maybe it's not too good to be true...

On 7/15/24 00:06, Rob Robinett via groups.io wrote:
> I have had good results with other Aliexpress vendors and I
> couldn't resist this 50% off sale:
>

> https://www.aliexpress.us/item/3256807172902214.html?spm=a2g0o.productlist.main.27.6aa4rQczrQczDQ&algo_pvid=d16c383c-2d00-4c3b-b197-8ab9fa49ce25&algo_exp_id=d16c383c-2d00-4c3b-b197-8ab9fa49ce25-13&pdp_npi=4%40dis%21USD%21180.58%2190.29%21%21%211307.58%21653.79%21%402103080b17210158960264408e3cf5%2112000040415704767%21sea%21US%21788778068%21X&curPageLogUid=Oa38uJidIWIz&utparam-url=scene%3Asearch%7Cquery_from%3A <https://www.aliexpress.us/item/3256807172902214.html?spm=a2g0o.productlist.main.27.6aa4rQczrQczDQ&algo_pvid=d16c383c-2d00-4c3b-b197-8ab9fa49ce25&algo_exp_id=d16c383c-2d00-4c3b-b197-8ab9fa49ce25-13&pdp_npi=4%40dis%21USD%21180.58%2190.29%21%21%211307.58%21653.79%21%402103080b17210158960264408e3cf5%2112000040415704767%21sea%21US%21788778068%21X&curPageLogUid=Oa38uJidIWIz&utparam-url=scene%3Asearch%7Cquery_from%3A>
>
> --
> Rob Robinett
> AI6VN
> r...@robinett.us <mailto:r...@robinett.us>

> mobile: +1 650 218 8896

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[John Ackermann N8UR]

I'm just curious -- has anyone here done anything with the VHF/UHF
downconverter in the RX888? Is it accessible using the Linux driver?

From the schematics I've seen, it looks like the converter uses the
same clock as the ADC, so it should be able to have excellent
stability/accuracy when used with a GPSDO.

On 7/15/24 00:06, Rob Robinett via groups.io wrote:

> I have had good results with other Aliexpress vendors and I
> couldn't resist this 50% off sale:
>

> https://www.aliexpress.us/item/3256807172902214.html?spm=a2g0o.productlist.main.27.6aa4rQczrQczDQ&algo_pvid=d16c383c-2d00-4c3b-b197-8ab9fa49ce25&algo_exp_id=d16c383c-2d00-4c3b-b197-8ab9fa49ce25-13&pdp_npi=4%40dis%21USD%21180.58%2190.29%21%21%211307.58%21653.79%21%402103080b17210158960264408e3cf5%2112000040415704767%21sea%21US%21788778068%21X&curPageLogUid=Oa38uJidIWIz&utparam-url=scene%3Asearch%7Cquery_from%3A <https://www.aliexpress.us/item/3256807172902214.html?spm=a2g0o.productlist.main.27.6aa4rQczrQczDQ&algo_pvid=d16c383c-2d00-4c3b-b197-8ab9fa49ce25&algo_exp_id=d16c383c-2d00-4c3b-b197-8ab9fa49ce25-13&pdp_npi=4%40dis%21USD%21180.58%2190.29%21%21%211307.58%21653.79%21%402103080b17210158960264408e3cf5%2112000040415704767%21sea%21US%21788778068%21X&curPageLogUid=Oa38uJidIWIz&utparam-url=scene%3Asearch%7Cquery_from%3A>
>
> --
> Rob Robinett
> AI6VN
> r...@robinett.us <mailto:r...@robinett.us>

> mobile: +1 650 218 8896