New RX888 Mk II for $90
Rob Robinett
Rob Robinett
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
>
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Franco Venturi
John Ackermann N8UR
(I paid about $160 for one of those at Hamvention). It seems to have
similar frequency coverage and with its better ADC and wider bandwidth
it could be a very capable receiver.
On 7/16/24 16:39, Rob Robinett via groups.io wrote:
> Phil has not implemented use of the RX888 downconverter.
> It seems there are several excellent VHF/UHF SDRs already supported by
> KA9Q-radio.
> Unlike the 0-30 bands where the RX888 is a unique product, it would at
> best only duplicate the functionality of an Airspy or SDRPlay on VHF/UHF.
>
> On Mon, Jul 15, 2024 at 6:35 PM John Ackermann N8UR via groups.io
>
> 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.
>
> > I have had good results with other Aliexpress vendors and I
> > couldn't resist this 50% off sale:
> >
> >
> >
> > --
> > Rob Robinett
> > AI6VN
> > r...@robinett.us <mailto:r...@robinett.us> <mailto:r...@robinett.us
> > mobile: +1 650 218 8896
> >
>
>
>
>
>
>
>
> --
> Rob Robinett
> AI6VN
> r...@robinett.us <mailto:r...@robinett.us>
> mobile: +1 650 218 8896
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John Ackermann N8UR
next week or so.
John
----
> > I have had good results with other Aliexpress vendors and I
> > couldn't resist this 50% off sale:
> >
>
> >
> > mobile: +1 650 218 8896 <tel:(650)%20218-8896>
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Phil Karn
I guess I should play with it and pull it into my version if it works. Yeah, it's no better than an Airspy R2 since both use the same TV tuner front end with a ~8 MHz bandwidth, but it's worth supporting just for the flexibility.
Phil
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Rob Robinett
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Franco VENTURI
- there's a new setting called 'frequency' that allows to set the LO frequency of the VHF/UHF tuner. That value can also be changed with the function 'rx888_tune()', which works the same way 'airspy_tune()' does for the Airspy. A selection of 'frequency=0' (i.e. 'rx888_tune(0)') should set the RX888 in direct sampling mode ('HF mode'), the same way we run the RX888 today
- the Rafael Micro R828D tuner has several gains/attenuations: in this first version I mapped the configuration setting 'att' to 'R82XX_ATTENUATOR' (it is mapped to 'DAT31_ATT' in HF mode) and the configuration setting 'gain' to 'R82XX_VGA' (instead of 'AD8340_VGA'), but these gain/attenuation mappings can be easily changed later as we see fit.
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Rob Robinett
John Ackermann N8UR
system. Not sure if we're likely to see any WSPR activity on VHF/UHF
here, but it will be on a discone antenna and there should be plenty of
signals simply to listen to.
John
----
On 7/17/24 20:34, Rob Robinett wrote:
> Hi Franco,
>
> I have alerted Phil to your new code and I'll look for WD sites beyond
> John's where we can test it out.
>
> Thanks!
>
> Rob
>
> On Wed, Jul 17, 2024 at 5:28 PM Franco VENTURI <fven...@comcast.net
>
> __
> ka9q-radio group and it got deleted twice.
> I ported all the (untested) changes I made a while ago to 'rx888.c'
> to support the VHF/UHF tuner to the latest version from Phil's
> repository, so that the branch 'rx888-vhf' in my repository
> (https://github.com/fventuri/ka9q-radio/tree/rx888-vhf
> A couple of comments:
> - there's a new setting called 'frequency' that allows to set the LO
> frequency of the VHF/UHF tuner. That value can also be changed with
> the function 'rx888_tune()', which works the same way
> 'airspy_tune()' does for the Airspy. A selection of 'frequency=0'
> (i.e. 'rx888_tune(0)') should set the RX888 in direct sampling mode
> ('HF mode'), the same way we run the RX888 today
> - the Rafael Micro R828D tuner has several gains/attenuations: in
> this first version I mapped the configuration setting 'att' to
> 'R82XX_ATTENUATOR' (it is mapped to 'DAT31_ATT' in HF mode) and the
> configuration setting 'gain' to 'R82XX_VGA' (instead of
> 'AD8340_VGA'), but these gain/attenuation mappings can be easily
> changed later as we see fit.
> Franco
> Franco
>> On 07/17/2024 3:18 PM EDT Rob Robinett <r...@robinett.us
>> The RX888 appears to be (almost) unique in its external clock
>> input which is needed for WSPR reception on VHF/UHF bands, not to
>> mention its low cost.
>> So I think it is important to include support for the tuner in
>> KA9Q-radio.
>> Rob
>>
>> On Wed, Jul 17, 2024 at 9:01 AM Phil Karn <ka...@ka9q.net
>>
>> __
>>> > I have had good results with other Aliexpress
>>> vendors and I
>>> > couldn't resist this 50% off sale:
>>> >
>>>
>>> >
>>> > --
>>> > Rob Robinett
>>> > AI6VN
>>> > r...@robinett.us <mailto:r...@robinett.us>
>>>
>>>
>>>
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Phil Karn
The Airspy R2 has external clocking at 10 MHz, which is why I have so much 10 MHz floating around my shack.
I don't really need a precise clock to monitor the local
repeaters, but it was handy when I was looking at local digital TV
pilot carriers.
David McGaw
BTW, I was given the wrong tracking number for the RX888 I ordered. Fingers crossed it makes it here.
David N1HAC
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Phil Karn
On 7/16/24 14:17, 'Franco Venturi' via ka9q-radio wrote:
Dave Larsen
I have been running a 2m receiver with ka9q-radio and airspyR2 for about 6 months.
I have spare rx888s. Suggestions on swapping the receivers? (Conf file or other changes)
Dave KV0S
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Rob Robinett
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Dave Larsen
I was using the airspyR2 to monitor 2m repeaters especially during server weather.
I will explore the possibilities.
Dave KV0S
Phil Karn
Dave, are you using an external frequency reference on your Airspy R2? Not really meaningful for FM repeater monitoring, but obviously useful for WSPR spotting. It requires 10 MHz rather than 27 MHz, which is a problem if you also monitor WWV on 10 MHz; it gets everywhere.
The Airspy R2 will automatically switch to the external reference
when present, but be careful. It *may* lock up if it loses that
reference (instead of reverting to the internal TCXO). This may
require a power cycle of the device, or at least a reboot of the
host.
Andy Z - K1RA
Rob Robinett
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Franco Venturi
glenn.e...@gmail.com
Rob Robinett
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Franco Venturi
Franco Venturi
A couple of comments:
- there's a new setting called 'frequency' that allows to set the LO frequency of the VHF/UHF tuner. That value can also be changed with the function 'rx888_tune()', which works the same way 'airspy_tune()' does for the Airspy. A selection of 'frequency=0' (i.e. 'rx888_tune(0)') should set the RX888 in direct sampling mode ('HF mode'), the same way we run the RX888 today
Franco
Franco Venturi
Rob Robinett
Robert:
Yes, on Ali you cannot start the refund process for something you did not receive, until you mark it as received;
The process to get their maze, step by step is:
On order , awaiting deliver page: click Order Details
Next to item , click: Returns/Refunds
On “Have You Received Your Package” : Click Yes (Otherwise it loops you to just wait for delivery)
This brings you to Returns/Refunds: Then you can get to indicate what not is right because of fake delivery. It’s useful to have captured the tracking dialog that shows where it was actually delivered and to point t the correct shipping address. (Paste in the dialog with tracking)
However I cannot step you through from this point now because their system now is crashing at that point.
Will catch up later when their system is back on line.
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
From: ham...@googlegroups.com [mailto:ham...@googlegroups.com] On Behalf Of Bob Confrey
Sent: Friday, July 19, 2024 11:44 AM
To: ham...@googlegroups.com
Subject: Re: [HamSCI] Aliexpresss vendor may be scam
Thanks Lester. So you are saying on Ali, MARK it as delivered then proceed to show it was delivered with a tracking number that was NOT my address?
Sorry for the ignorance here, I have not had to deal with this before.
I think the problem is the real people at Ali have not gotten in the loop yet. The seller tried to buy me off with a 10% refund. Refused.
TNX!
Bob
EDJ
On Fri, Jul 19, 2024 at 11:36 AM 'Lester Veenstra' via HamSCI <ham...@googlegroups.com> wrote:
Bob:
The delivery to another address on a tracking number given to you is a seller scam I know well.
On AliExpress hark it delivered so that you can claim a refund and then show the tracking delivery information from the shipper to Ali . This worked for me in the past.
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
From: ham...@googlegroups.com [mailto:ham...@googlegroups.com] On Behalf Of Bob Confrey
Sent: Friday, July 19, 2024 10:19 AM
To: ham...@googlegroups.com
Subject: Re: [HamSCI] Aliexpresss vendor may be scam
Bob N4HY, When I checked the store that sold it, it showed "on vacation" As Ali recommeds, start with the vendor. That does not sound good.
Do you know where on Ali a complaint can be stated? I've never had a problem to know where to go.
I'd think between Ali and PayPal, we should be protected.
Hopefully.......
Bob
EDJ
On Fri, Jul 19, 2024 at 9:47 AM Robert McGwier <rwmc...@gmail.com> wrote:
According to Aliexpress and Fedex mine is sitting in Charlotte to be delivered in 5 days. I have no idea why five days from there. I also uses PayPal. Which I always do with Ali.
73s
N4HY
Dr. Robert W McGwier, Ph.D.
Affiliated Faculty, Virginia TechAffiliated Faculty, University of Scranton
Former ARDC Member of Board
N4HY: ARRL, TAPR, AMSAT, EARC, CSVHFS
Sky: AAVSO, Sky360, explorescu.org, Skyscrapers
On Fri, Jul 19, 2024 at 9:33 AM Bob Confrey <bob...@gmail.com> wrote:
Used PayPal. As I always do on Ali. With good results so far.
Bob
On Fri, Jul 19, 2024 at 9:32 AM Bob Gerzoff <b...@bobgerzoff.com> wrote:
I presume it was on a credit card? If so, you can contest the charge within a reasonable period. Just don't wait too long or you won't be able to. Some lenders will try to drag the process out so you can't recoup your money.
Bob
WK2Y
From: ham...@googlegroups.com <ham...@googlegroups.com> On Behalf Of Bob Confrey
Sent: Friday, July 19, 2024 9:27 AM
To: ham...@googlegroups.com
Subject: Re: [HamSCI] Aliexpresss vendor may be scam
I ordered one too. Something isn't right. Supplied Fedex tracking shows package was delivered to address in Washing dc area yesterday. Not my package, was 61 lbs.
Mine, the RX888 is still due by 7/25. Do I wait and see or raise a red flag with Ali now?
Finding where to do that with Ali is in itself a mystery.
Any advice? I've always had good luck with Ali.
Bob
WA1EDJ
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