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Hi,
I must be the first to have snapped my antenna. Totally my fault - fell asleep on it.
Is it possible to source just an antenna replacement?
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https://www.ebay.com/sch/i.html?_nkw=sma+male+antenna+telescopic --
For more info on the tinySA go to https://tinysa.org/wiki/
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No, you are in a long line of those that has done that. Where are you located? Clyde KC7BJE?
Hi,
I must be the first to have snapped my antenna. Totally my fault - fell asleep on it.
Is it possible to source just an antenna replacement?
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On Fri, Jan 13, 2023 at 12:24 PM, Erik Kaashoek wrote:
https://www.ebay.com/sch/i.html?_nkw=sma+male+antenna+telescopic
Thanks. Does the length, number of sections, etc matter when selecting an antenna?
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Thanks. At least I don't feel like the total noob I am now.
I am in Kenya i.e. Africa and bought my ultra from the Zeenko store on aliexpress.
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Not at all you are the first, the antenna is a very weak part and exposed to everything, no matter how careful you are.
The cheapest ones, you can find them on Aliexpress, for example:
Toni
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On Fri, Jan 13, 2023 at 02:58 AM, KESAHZ wrote:
Does the length, number of sections, etc matter when selecting an antenna?
You can choose any length you like. For low frequency RFI hunting a long antenna is better The length determines the "optimal" frequency range it will receive. A quarter wavelength is optimal. ? --
For more info on the tinySA go to https://tinysa.org/wiki/
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On Fri, Jan 13, 2023 at 12:08 PM, Erik Kaashoek wrote:
A quarter wavelength is optimal.
See my quick NanoVNA screenshots, measured with the?tinaSA original antenna: minimal length (9 cm)  maximal length (30 cm)  For FM radio or 2m band I would take a longer antenna, or just order a long and a short one to be more flexible. Martin
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It needs to be remembered that the whip part of the antenna, is only a part of the antenna. The other part is the case of the instrument and whatever else the case is "connected" to, i.e. it's the counterpoise.? Striving for a particular length makes little sense, unless this is taken into consideration.
Wes? N7WS
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I would hesitate to put a longer antenna on the tinysa or nanovna from a mechanical point of view - it will put a lot of strain on the sma and could ultimately break the connector from the pcb.
Tim
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On 13 Jan 2023, at 13:00, Wes Stewart via < n7ws@...> wrote:
It needs to be remembered that the whip part of the antenna, is only a part of the antenna. The other part is the case of the instrument and whatever else the case is "connected" to, i.e. it's the counterpoise.? Striving for a particular length makes little sense, unless this is taken into consideration.
Wes? N7WS
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Now you can all see why I buy 'multiples' of everything I buy! Had he bought like I do then, he would have spare parts in which to cannibalize, like we all had to in my earlier 'Air Force' days. Hell, even buying a 'cloned' unit should never be thrown away, for that particular reason of needing spare parts. GOOD DAY Erik and the designing team, for producing this beautiful piece of equipment.
On Friday, January 13, 2023, 05:08:27 AM CST, Erik Kaashoek <erik@...> wrote:
On Fri, Jan 13, 2023 at 02:58 AM, KESAHZ wrote: Does the length, number of sections, etc matter when selecting an antenna? You can choose any length you like. For low frequency RFI hunting a long antenna is better The length determines the "optimal" frequency range it will receive. A quarter wavelength is optimal. ? -- For more info on the tinySA go to https://tinysa.org/wiki/ -- George Dukish
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Thanks. Aliexpress is easier for me so I'm glad they have them.
On Fri, 13 Jan 2023 at 14:05, Toni Ciscar < aciscar@...> wrote: Not at all you are the first, the antenna is a very weak part and exposed to everything, no matter how careful you are.
The cheapest ones, you can find them on Aliexpress, for example:
Toni
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See my quick NanoVNA screenshots, measured with the?tinaSA original antenna:
I must admit I am not sure what these diagrams show. I will do some studying up on VNAs.
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On Fri, Jan 13, 2023 at 04:39 PM, Tim Ostley wrote:
I would hesitate to put a longer antenna on the tinysa or nanovna from a mechanical point of view - it will put a lot of strain on the sma and could ultimately break the connector from the pcb.
?
Tim
M0CZP
Makes sense. I think I'll buy short and long in doubles.
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I would hesitate to put a longer antenna on the tinysa or nanovna from a mechanical point of view - it will put a lot of strain on the sma and could ultimately break the connector from the pcb.
What I have tried is using my RTL-SDR antenna which has a soft cable link from the SMA to the antenna. So at least less strain but it is unwieldy. And that is a dipole antenna so I am also having to read up on what effect that has.
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You can choose any length you like.For low frequency RFI hunting a long antenna is betterThe length determines the "optimal" frequency range it will receive.A quarter wavelength is optimal.
Thanks. I am hunting a few signals ranging from about 10MHz to around 10GHz. Will do my calculations.
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Hello George,
I can't really follow your logic, Let's say for instance you bought
three
tinasa, one goes faulty, are you really going to wreck a good one to
repair
the faulty one? Doesn't make much sense to me.
Ken g8beq
On 13/01/2023 22:36, George Dukish via
groups.io wrote:
toggle quoted message
Show quoted text
Now you can all see why I buy 'multiples' of everything I
buy! Had he bought like I do then, he would have spare parts in
which to cannibalize, like we all had to in my earlier 'Air
Force' days. Hell, even buying a 'cloned' unit should never be
thrown away, for that particular reason of needing spare parts.
GOOD DAY Erik and the designing team, for producing this
beautiful piece of equipment.
On Friday, January 13, 2023, 05:08:27 AM CST, Erik
Kaashoek <erik@...> wrote:
On Fri, Jan 13, 2023 at 02:58 AM, KESAHZ wrote:
Does the length, number of sections, etc
matter when selecting an antenna?
You can choose any length you like.
For low frequency RFI hunting a long antenna is better
The length determines the "optimal" frequency range it
will receive.
A quarter wavelength is optimal.
?
--
For more info on the tinySA go to
--
George Dukish
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On Sat, Jan 14, 2023 at 08:16 AM, KESAHZ wrote:
I must admit I am not sure what these diagrams show.
Simply put, the dips in the green curves indicate the frequency at which the antenna is well matched. The frequency of the yellow curve is optimal where it is as close as possible to the centre of the circle (i.e. 50? ¦¸).In principle, two different indications for one phenomenon.
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The short antenna doesn¡¯t work well below 10 MHz since the antenna¡¯s impedance is so much higher than the 50 ohm analyzer input Z. It¡¯s not practical to use a resonant antenna at low frequencies so I build an ¡°impedance-booster¡± circuit. It¡¯s got unity gain but an input impedance of several K ohms. That lets me see broadcast band signals that otherwise are buried 30 dB below the noise floor. If you want a board or more details you can email me.
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Clyde Lambert
Ho-Ro
Wes Stewart