If you check the list you will see RandL are currently safe to buy from.
Roy WA0YMH
About from R&L Electronics?
Did NOT buy the tinySA from someone on ebay. You will be guaranteed to receive a clone that will not pass its own self test! Only by from the approved list vendors.
Roy WA0YMH
Here's a list of reputable vendors from the tinySA wiki:
? ??
Note that sells it for $49.95 (plus about $10 shipping) here in the US,
seems a better bet than going with a random ebay seller:
? ??
It's a successful product, clones of dubious quality are starting to show up.
Jerry, KE7ER
On Sun, Jan 10, 2021 at 10:40 PM, MadRadioModder wrote:
You can buy the TinySA on eBay for about $60 USD.? Works relatively well. Ive given away several to people that can¡¯t afford the Rigol.?
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About from R&L Electronics?
Did NOT buy the tinySA from someone on ebay. You will be guaranteed to receive a clone that will not pass its own self test! Only by from the approved list vendors.
Roy WA0YMH
Here's a list of reputable vendors from the tinySA wiki:
? ??
Note that sells it for $49.95 (plus about $10 shipping) here in the US,
seems a better bet than going with a random ebay seller:
? ??
It's a successful product, clones of dubious quality are starting to show up.
Jerry, KE7ER
On Sun, Jan 10, 2021 at 10:40 PM, MadRadioModder wrote:
You can buy the TinySA on eBay for about $60 USD.? Works relatively well. Ive given away several to people that can¡¯t afford the Rigol.?
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Did NOT buy the tinySA from someone on ebay. You will be guaranteed to receive a clone that will not pass its own self test! Only by from the approved list vendors.
Roy WA0YMH
Here's a list of reputable vendors from the tinySA wiki:
? ??
Note that sells it for $49.95 (plus about $10 shipping) here in the US,
seems a better bet than going with a random ebay seller:
? ??
It's a successful product, clones of dubious quality are starting to show up.
Jerry, KE7ER
On Sun, Jan 10, 2021 at 10:40 PM, MadRadioModder wrote:
You can buy the TinySA on eBay for about $60 USD.? Works relatively well. Ive given away several to people that can¡¯t afford the Rigol.?
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Great! I would like to know which transverters he uses and whether TX stability is fine or how is made acceptable. I had used in March 2019 a TS811 and a SGlab transverter, which was fine, but I would like to try the Ubitx or other non Big-Three rigs.
Il lun 11 gen 2021 02:53 PM padmanabhan cattamanchi via <PEPINDIA= [email protected]> ha scritto:
VU3FFM is on QO-100 regularly with a ubitx
Paddy VU2PEP/AC2DT
On Friday, January 8, 2021, 01:18:14 AM GMT+5:30, iz oos < and2oosiz2@...> wrote:
Hello everybody and HNY, Has anyone tried to operate QO-100 sat using a Ubitx? What a pity most operators in the US can't uplink that SAT!
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Here's a list of reputable vendors from the tinySA wiki:
? ??https://tinysa.org/wiki/pmwiki.php?n=Main.Buying
Note that randl.com sells it for $49.95 (plus about $10 shipping) here in the US,
seems a better bet than going with a random ebay seller:
? ??
It's a successful product, clones of dubious quality are starting to show up.
Jerry, KE7ER
On Sun, Jan 10, 2021 at 10:40 PM, MadRadioModder wrote:
You can buy the TinySA on eBay for about $60 USD. ?Works relatively well. Ive given away several to people that can¡¯t afford the Rigol.?
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Mick,
With the agc switched to off, the S meter voltage is zero
therefore no noise.
Loren
On 1/11/2021 8:36 AM, Mick wrote:
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Loren,
did you notice if the noise was still there if you turned the agc
switch off?
--
?
73
Mick VA3EPM?
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Loren, did you notice if the noise was still there if you turned the agc switch off? -- ?
73
Mick VA3EPM?
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I bought the ubitx V6 complete kit and also the AGC board from
kit-project.com.? It was installed on the ubitx board as directed.? A
simple SPDT switch was attached to the board for OFF and FAST.? A
voltmeter was attached to the S meter tab.
The radio worked okay but when a strong carrier was tuned in and the S
meter voltage began to rise.? When the voltage became greater than 1
volt, a static/hash sound? was heard in the receiver.
This static noise seems to be generated whenever the S meter voltage
becomes greater than 1 volt.? It goes away when the S meter voltage drops.
I thought that I may have damaged the AGC board so I bought another one
but it behaves the same way.? Does anyone know how to get rid of this
noise?? thanks
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Paddy, what frequency and mode is VU3FFM using? -- ?
73
Mick VA3EPM?
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Thank's for your answers
I¡¯m gonna look at this from the January 14th fall sales
cdt
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Dear OM,? I am interested to buy.?? Please let me know how much total (including SPEED POST Postel charges to my address in INDIA) you require from me in advance. ?Best of 73s.? ?BALSUN. VU2UYC.
Saw these, may be of interest...
Pack of 10 - IRF3205 N Channel FET Transistor 55V
sale price $2.95
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VU3FFM is on QO-100 regularly with a ubitx
Paddy VU2PEP/AC2DT
On Friday, January 8, 2021, 01:18:14 AM GMT+5:30, iz oos <and2oosiz2@...> wrote:
Hello everybody and HNY, Has anyone tried to operate QO-100 sat using a Ubitx? What a pity most operators in the US can't uplink that SAT!
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Hi Gerard,
actually the frequency measurement through a generator and an oscilloscope is possible only if you can synchronize the oscilloscope with the generator and if you have a mixer followed by a medium frequency and a logarithmic detector at the oscilloscope input, some time ago I made a small spectrum analyzer for my old HP181, it worked fine, it had a dynamics of about 90dB and a bandwidth of 300MHZ, the mixer was a module from Microcircuits, the MF and the quartz filter were a part of an old project of QST (analyzer for penniless HAM) and the logaritmic detector was a module with an AD8307.
The circuit isn't complex to build, but is it worth it?
Today there are so many KITs and so many small spectrum analyzers at such affordable prices that I don't think you need to venture into a home construction.
Do not be fooled by a VNA (vector network analyzer), it cannot act as a spectrum analyzer except through the FFT which, as is known to all laboratory technicians, poses many problems in interpreting the displayed data, including false harmonics, aliasing and unwanted beats, it's easier to blunder than to know exactly which armines your oscillator or TX is kicking out.
The technically best solution is to invest a few dollars in a decent Spectrum Analyzer (check that it has the possibility of a VCO voltage output to drive the sweep of your generator) and with that, combined with your generator and a simple AD8307 Logaritmic Detector module , you can do all the functions you want of any VNA.
Greetings de
-- IW4AJR Loris
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Re: From where to get the rx/tx control signal to the PA
No Raduino?do uBITX, ¨¦ o pino 5 (ptt).
73's PY2PVB
Rubens Kamimura T¨¦cnico em Eletr?nica e Eletrot¨¦cnica - Aposentado CFT/CRT-SP: 80254934820 Cel. +55 (18) 9-9819-2225 WhatsApp
Em s¨¢b., 9 de jan. de 2021 ¨¤s 17:44, Rafael Diniz < rafael@...> escreveu:
D7 right (TX_RX)? found.
On 1/9/21 4:19 PM, Rafael Diniz wrote:
> Hi all,
>
> In order to do the rx/tx switch in a PA, I need a control signal for it.
> The most obvious is the PTT one, but as I'll be keying the radio over
> CAT, I think it is not a possibility, right?. From where should I get
> the rx/tx control signal?
>
> Best regards,
> Rafael PU2UIT
>
>
>
>
>
>
>
>
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Re: From where to get the rx/tx control signal to the PA
hello Rafael and group, As I said before, I use uBIX v4, and the radio enters RX just by feeding it with + 12Vdc, you can switch to TX: via VOX, CAT, PTT, CW woodpecker (manual) or Iambic?A or B, etc ... Particularly I use the JTDX software in FT8 and do TX manually via the TUNE icon (in JTDX). Any additional information will be QAP / QRV. 73's de Rubens py2pvb Em s¨¢b., 9 de jan. de 2021 ¨¤s 17:44, Rafael Diniz < rafael@...> escreveu:
D7 right (TX_RX)? found.
On 1/9/21 4:19 PM, Rafael Diniz wrote:
> Hi all,
>
> In order to do the rx/tx switch in a PA, I need a control signal for it.
> The most obvious is the PTT one, but as I'll be keying the radio over
> CAT, I think it is not a possibility, right?. From where should I get
> the rx/tx control signal?
>
> Best regards,
> Rafael PU2UIT
>
>
>
>
>
>
>
>
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Gerard,
The board that you listed is for 33MHz to 4400, outside of the uBITX frequencies.?
To be able to use for spectral purity, as well as the IF frequencies, you would want a unit that can measure up to the 3rd harmonic of the highest frequency that the transmitter will output.? for the uBITX that would be 150MHz.
?You also want the lower frequency to be below the lowest transmitter output/signal to be measured.? For the uBITX that would be 3MHz or less.
The last thing to be aware of is the resolution bandwidth RBW.? The smaller the better.
The TinySA is a good low-cost spectrum analyzer, with just one shortcoming: The RBW is only 3kHz.? That makes it hard to measure IMD values for audio signals on transmitters.? For the $60 it cannot be beaten.?
A midlevel SA will have an RBW of less than 100Hz, like the Rigol and Siglent models.
When assembling your tools, be sure to include an attenuator or tap to limit the power sent to the SA.? Here is a link to one that can be built that I use.? It costs about $10 for the parts without shipping costs:
With the TinySA you may also need a step attenuator to improve measurement performance:
NOTE: you still need the tap, as the attenuator is rated for 1/4 watt (250mW).
There is also the SDR dongle software for SA.? That is good for the IMD but has issues with spaning for third harmonics in a single scan.? I have used the TinySA and an SDRPlay RSP1A to get what I need so far.? The total cost of all is around $250US.? Still less than the lower-cost Rigol equipment.
One day I will break down and order one of the midlevel SA listed above.? Currently leaning towards the Siglent based on reviews and specs.
Above are my thoughts based on my experiences.? YMMV
73
Evan
AC9TU
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You can buy the TinySA on eBay for about $60 USD. ?Works relatively well. Ive given away several to people that can¡¯t afford the Rigol.?
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On Jan 10, 2021, at 9:23 PM, Jerry Gaffke via groups.io <jgaffke@...> wrote:
?Here's the forum for that tiny spectrum analyzer: ? ??/g/tinysa On Sun, Jan 10, 2021 at 05:20 PM, Ashhar Farhan wrote:
The other alternatives are the tiny spectrum analyzer that I have heard but not used.
--
¡_. _._
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Here's the forum for that tiny spectrum analyzer:
? ??/g/tinysa
toggle quoted message
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On Sun, Jan 10, 2021 at 05:20 PM, Ashhar Farhan wrote:
The other alternatives are the tiny spectrum analyzer that I have heard but not used.
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Spectrum analyser needs 80 db or measurement range. Oscilloscope will not provide that. Nor can it distinguish between frequency components. For instance, if your transmitter has a third harmonic that is 30db down, it cant register that. Your cheap bet is to get an Antuino for 100 dollars. It is an swr meter and a simple spectrum analyzer with limitations, but entirely adequate for homebrewing.? The other alternatives are the tiny spectrum analyzer that I have heard but not used. Finally, you could invest in a Rigol. At over $1000 usd, buy it with a tracking generator. It is bjg ticket bu entirely worth it. - f
On Mon 11 Jan, 2021, 1:53 AM Gerard, < kabupos@...> wrote: Good evening, I am a bit new in this field and I do not have all the material for in-depth analysis
My first question is whether you can emulate a spectrum analyzer with an oscilloscope and an HF generator
I have a 2*50MHZ oscillo and a FY6900 60MHZ generator that offers a lot of possibilities (see doc)
Another possibility is to use a card and connect it to a PC
There¡¯s this one over there for 45$ (37€)
I rely on your expertise
Thank's for your answers
cdt
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K2ICC
Gerard
Mick
Loris Bollina
MadRadioModder