Date   

Re: Lo Noise Voltage regulators

G8ZHA
 

Is there anything available in a SOT-89 type package, if it has the 0v in the center then I can get it onto the PCB?

 

Rich

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Leo Bodnar
Sent: 15 November 2019 19:11
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Lo Noise Voltage regulators

 

LT3042 total noise in 10Hz to 100kHz range is 0.8μVRMS.
Typical TO-92 is about 100 times worse. It's your choice.
--
Leo Bodnar / M0XER


Re: Dish Art

alwyn.seeds1
 

Dear Ian,

That brought back happy memories of playing on the White Cliffs in the early 1960s; things had been pretty much left as they were at the end of WW2, which provided plenty of excitement, plus a few near death experiences.

We really liked the sound mirrors.

Regards,

Alwyn

_____________________________________________________

Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
_____________________________________________________


Re: Wimo 13cms yagi

Mike Willis
 

Not only that it would not be stable with time or rain. This is more likely to be a resonance than the antenna. You have to use the best quality cable on 13cm and as few connectors as you can. The quality of the connectors is critical too. Might there be a mast head pre-amp involved?
--
Mike G0MJW


Re: Wimo 13cms aerial VSWR

alwyn.seeds1
 

Dear All,

Yes, I have always liked the HP8753, but they are not cheap.

Although it is only a scalar analyser, the Anritsu S331 is pretty useful for aerial adjustment.

Also, it’s intended for use by riggers, so is compact lightweight and battery powered, so handy in the field.

A few hundred pounds on e-bay is the typical price.

Regards,

Alwyn

_____________________________________________________

Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
_____________________________________________________


Re: Wimo 13cms yagi

Alan Beard
 

Hi Ed, another thought,

1/2 in. Heliax:   There's the truly helical type and the ridged, not helical one.

Put your fingernails into the ridges and rotate the cable.

The non helical type is OK up to 70cm from my experience.
Above 70cm use the truly helical type.

With both the Wiltron 640 and the Atten 5011A, I found at 23cm the ridged
cable had horrible resonances.

On the subject of cables, the satellite cable, foil under the outer braid MUST
electrically connect to the braid. The blue coloured aluminium foil shield does
not connect to the wire braid reliably and in the F connectors does not connect
to the connector outer.

Though the specs are superb it's useless for us hams.

Heliax, has any body else had these experiences?


On Sat, 16 Nov 2019 06:11:53 +1000, Alan Beard wrote
> Hi Ed,
>
>

> The difference in frequency 2320 to 2332 MHz is so so small, there's a resonance somewhere.
> My experience is, at this frequency everything  has to be perfect, cables and connectors!!
> Try different cables. The antenna SWR is not likely to be that sharp.
>
>

> Alan VK2ZIW 
>
>

> On Fri, 15 Nov 2019 12:05:53 +0000, Ed G3VPF wrote
> > I recently purchased a Wimo SHF2344 44 ele 13cms yagi and an SG-Labs 13cms transverter hoping to be on for the contest at the weekend. However, the transverter shows an SWR warning light when feeding the yagi at 2320MHz. Using the built in directional coupler shows a VSWR at 2320 at 2:1, but better than 1.1:1 at 2332 MHz.
> >
> > Can anyone offer advice on an adjustment I can make to the yagi to persuade the lower SWR down to 2320?
> >
> > Ed
> >
> > G3VPF IO80RQ
>
> ---------------------------------------------------
> Alan Beard
>
> OpenWebMail 2.53
>
>

---------------------------------------------------
Alan Beard

OpenWebMail 2.53


Re: Wimo 13cms yagi

Alan Beard
 

Hi Ed,

The difference in frequency 2320 to 2332 MHz is so so small, there's a resonance somewhere.
My experience is, at this frequency everything  has to be perfect, cables and connectors!!
Try different cables. The antenna SWR is not likely to be that sharp.

Alan VK2ZIW 

On Fri, 15 Nov 2019 12:05:53 +0000, Ed G3VPF wrote
> I recently purchased a Wimo SHF2344 44 ele 13cms yagi and an SG-Labs 13cms transverter hoping to be on for the contest at the weekend. However, the transverter shows an SWR warning light when feeding the yagi at 2320MHz. Using the built in directional coupler shows a VSWR at 2320 at 2:1, but better than 1.1:1 at 2332 MHz.
>
> Can anyone offer advice on an adjustment I can make to the yagi to persuade the lower SWR down to 2320?
>
> Ed
>
> G3VPF IO80RQ

---------------------------------------------------
Alan Beard

OpenWebMail 2.53


Re: Lo Noise Voltage regulators

Leo Bodnar
 

LT3042 total noise in 10Hz to 100kHz range is 0.8μVRMS.
Typical TO-92 is about 100 times worse. It's your choice.
--
Leo Bodnar / M0XER


Re: Lo Noise Voltage regulators

G8ZHA
 

Thanks for the reply. I really need them in TO-92 packages though, to suit the W1GHZ GPSDO pcb.

 

Rich

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of brian.flynn via Groups.Io
Sent: 15 November 2019 17:38
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Lo Noise Voltage regulators

 

Hi Rich,

The best ones I have found are the  the AD  ADM7150 series. there is a 3.3V variant. I used them in with the AD5355 PLL chips.
They are a bit pricier that the usual 3 terminal varieties! AD are quite generous with samples. Farnell and RS stock them.

See
https://gm8bjf.joomla.com/past-talks/15-reducing-phase-noise-pn-on-chinese-adf5355-boards

73s
Brian GM8BJF.


Re: Lo Noise Voltage regulators

Brian Flynn GM8BJF
 

Hi Rich,

The best ones I have found are the  the AD  ADM7150 series. there is a 3.3V variant. I used them in with the AD5355 PLL chips.
They are a bit pricier that the usual 3 terminal varieties! AD are quite generous with samples. Farnell and RS stock them.

See
https://gm8bjf.joomla.com/past-talks/15-reducing-phase-noise-pn-on-chinese-adf5355-boards

73s
Brian GM8BJF.


Re: Wimo 13cms aerial VSWR

SAM JEWELL
 

Ed,
Hardly a recommendation....I use an HP 5753C and S parameter test set. The price was good!
Calibration is done at the end of the test cable using professional SOT calibration and a good test cable.
I purposely said that the cheapies didn’t allow ‘measurement’ at 2.3GHz, but the indications can still be useful.
It’s all down to how good the directivity is of whatever the ‘device’ is that is discriminating the direction of signal ‘flow’.
It goes without saying that when the VNA is not directly connected to the antenna feedpoint, and a coax cable is used, then it is necessary to calibrate at the antenna end of the connecting cable, using a good, known, cal kit SOT set.

I find it useful to test with various good quality Attenuators at the end of the cable. The attenuators are terminated in a short (or open) to minimise fringing effects. 3 and 6dB attenuators should read close to twice their attenuation. 10dB and higher will probably show increasing error.  Calibrated mismatches are harder to find but can be made, but will need calibrating with a known, good  VNA.

I hope that helps?

73 de Sam

On Friday, November 15, 2019, 4:17 pm, Ed G3VPF <g3vpf@...> wrote:

Sorry to start a new thread but Groups.io rejected my attempts to reply to the old thread!

Many thanks for the replies so far. Once the weather improves I will set things up on the lawn and have a play with the various ideas. Currently bitterly cold with horizontal drizzle - not ideal for playing with aerials.

Sam - which VNA's are OK on 13cms? At present only test gear I have is the directional coupler  built into the transverter. Had a quick look on the internet but only found two that claimed to work at 2.3GHz, of which only the Mini-VNA was reasonably priced.

Ed
 G3VPF IO80RQ


Wimo 13cms aerial VSWR

Ed G3VPF
 

Sorry to start a new thread but Groups.io rejected my attempts to reply to the old thread!

Many thanks for the replies so far. Once the weather improves I will set things up on the lawn and have a play with the various ideas. Currently bitterly cold with horizontal drizzle - not ideal for playing with aerials.

Sam - which VNA's are OK on 13cms? At present only test gear I have is the directional coupler  built into the transverter. Had a quick look on the internet but only found two that claimed to work at 2.3GHz, of which only the Mini-VNA was reasonably priced.

Ed
 G3VPF IO80RQ


Re: Wimo 13cms yagi

Ed G3VPF
 

Many thanks for the replies so far. Once the weather improves I will set things up on the lawn and have a play with the various ideas. Currently bitterly cold with horizontal drizzle - not ideal for playing with aerials.

Sam - which VNA's are OK on 13cms? At present only test gear I have is the directional coupler  built into the transverter. Had a quick look on the internet but only found two that claimed to work at 2.3GHz, of which only the Mini-VNA was reasonably priced.

Ed
G3VPF IO80RQ


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of SAM JEWELL via Groups.Io <jewell@...>
Sent: 15 November 2019 13:10
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Wimo 13cms yagi
 
Actually, I humbly disagree with John. The easiest way to achieve a good match is to slightly press down in the centre of the driven element on the Wimo 67 element 13 cm......... make sure your VNA is up to the job at 13cm. The typical, cheap, Chinese made VNAs do not have the directivity to give anything like a decent measurement  at 13cm.  IMHO.......My experience of a number of these instruments.

73 de Sam, G4DDK




Sent from Yahoo Mail for iPad

On Friday, November 15, 2019, 12:57 pm, John Lemay <john@...> wrote:

Hello Ed

 

With almost all yagis, the position and length of the first director is critical, and sometimes in mass production things go adrift. You’re probably stuck with its position but you can experiment carefully by bending the tips of D1 closer to or further away from the driven element. You can also see – temporarily – the effect of lengthening the element by wrapping a bit of solver foil around each end.

 

Being 13cms, your adjustments will need to be in mm iterations.

 

Do not be tempted to adjust the driven element (unless it has distorted in shipping). The Wimo DE is relatively fragile and it’s possible to break internal connections, or to compromise the weather seal.

 

It’s good fun adjusting aerials, especially when it is wet and windy outside………..

 

Good luck

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Ed G3VPF
Sent: 15 November 2019 12:06
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Wimo 13cms yagi

 

I recently purchased a Wimo SHF2344 44 ele 13cms yagi and an SG-Labs 13cms transverter hoping to be on for the contest at the weekend. However, the transverter shows an SWR warning light when feeding the yagi at 2320MHz. Using the built in directional coupler shows a VSWR at 2320 at 2:1, but better than 1.1:1 at 2332 MHz.

 

Can anyone offer advice on an adjustment I can make to the yagi to persuade the lower SWR down to 2320?

 

Ed

G3VPF IO80RQ


Re: Wimo 13cms yagi

Ed G3VPF
 

Many thanks for the replies so far. Once the weather improves I will set things up on the lawn and have a play with the various ideas. Currently bitterly cold with horizontal drizzle - not ideal for playing with aerials.

Sam - which VNA's are OK on 13cms? At present only test gear I have is the directional coupler  built into the transverter. Had a quick look on the internet but only found two that claimed to work at 2.3GHz, of which only the Mini-VNA was reasonably priced.

Ed

G3VPF IO80RQ


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of SAM JEWELL via Groups.Io <jewell@...>
Sent: 15 November 2019 13:10
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Wimo 13cms yagi
 
Actually, I humbly disagree with John. The easiest way to achieve a good match is to slightly press down in the centre of the driven element on the Wimo 67 element 13 cm......... make sure your VNA is up to the job at 13cm. The typical, cheap, Chinese made VNAs do not have the directivity to give anything like a decent measurement  at 13cm.  IMHO.......My experience of a number of these instruments.

73 de Sam, G4DDK




Sent from Yahoo Mail for iPad

On Friday, November 15, 2019, 12:57 pm, John Lemay <john@...> wrote:

Hello Ed

 

With almost all yagis, the position and length of the first director is critical, and sometimes in mass production things go adrift. You’re probably stuck with its position but you can experiment carefully by bending the tips of D1 closer to or further away from the driven element. You can also see – temporarily – the effect of lengthening the element by wrapping a bit of solver foil around each end.

 

Being 13cms, your adjustments will need to be in mm iterations.

 

Do not be tempted to adjust the driven element (unless it has distorted in shipping). The Wimo DE is relatively fragile and it’s possible to break internal connections, or to compromise the weather seal.

 

It’s good fun adjusting aerials, especially when it is wet and windy outside………..

 

Good luck

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Ed G3VPF
Sent: 15 November 2019 12:06
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Wimo 13cms yagi

 

I recently purchased a Wimo SHF2344 44 ele 13cms yagi and an SG-Labs 13cms transverter hoping to be on for the contest at the weekend. However, the transverter shows an SWR warning light when feeding the yagi at 2320MHz. Using the built in directional coupler shows a VSWR at 2320 at 2:1, but better than 1.1:1 at 2332 MHz.

 

Can anyone offer advice on an adjustment I can make to the yagi to persuade the lower SWR down to 2320?

 

Ed

G3VPF IO80RQ


Re: Dish Art

ian hope (2E0IJH)
 

The National Trust has also dug the one out at Fan Bay as part of the works of opening up Fan bay deep shelter.
 
 
Ian
2e0ijh
 
Ps Nick not been that far from you today was working at G4ZIF's at Faussett Hill

 
Sent: Friday, November 15, 2019 at 10:02 AM
From: "Nicholas Shaxted" <nick@...>
To: "UKMicrowaves@groups.io" <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Dish Art

Maybe I should throw this link into the expanding dish collection before it gets out of hand 😊

 

Down here in Far Sarf_Eest Ingerland we have a some concrete dishes – just to pleez Andi and qualify for inclusion on this thread they were TAgGeD by some unknow local artist.

 

All under the protection of the RSPB at Greatstone Lakes on Romney Marsh

Please look at https://theromneymarsh.net/soundmirrors

 

 

 

Mit freundlichen Grüßen, Com os melhores cumprimentos, 敬具

Le gach dea-ghuí. Venlig Hilsen, Distinti Saluti, مع جزيل الشكر و التقدير

 

73 de

Nick – g4ogi from JO01mg

 

brexit risu digna delenda est

 

You see things; and you say 'Why?' But I dream things that never were; and I say 'why not?' ~ George Bernard Shaw

 

 

 

 

From: UKMicrowaves@groups.io On Behalf Of Bob_G1ZJP via Groups.Io
Sent: Friday, November 15, 2019 9:40 AM
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dish Art

 

Here's a sample of Lincolnshire's contribution to the world of "Dish Art" ~ Photo copyright of Diane Seddon ARPS CPAGB BPE3*

Here's the BBC version of the story ~ 
https://www.bbc.co.uk/news/uk-england-lincolnshire-46058571 


73
Bob, G1ZJP

 


Re: Lo Noise Voltage regulators

Leo Bodnar
 

How low do you need the noise to be?
--
Leo Bodnar / M0XER


Re: Wimo 13cms yagi

SAM JEWELL
 

Actually, I humbly disagree with John. The easiest way to achieve a good match is to slightly press down in the centre of the driven element on the Wimo 67 element 13 cm......... make sure your VNA is up to the job at 13cm. The typical, cheap, Chinese made VNAs do not have the directivity to give anything like a decent measurement  at 13cm.  IMHO.......My experience of a number of these instruments.

73 de Sam, G4DDK

On Friday, November 15, 2019, 12:57 pm, John Lemay <john@...> wrote:

Hello Ed

 

With almost all yagis, the position and length of the first director is critical, and sometimes in mass production things go adrift. You’re probably stuck with its position but you can experiment carefully by bending the tips of D1 closer to or further away from the driven element. You can also see – temporarily – the effect of lengthening the element by wrapping a bit of solver foil around each end.

 

Being 13cms, your adjustments will need to be in mm iterations.

 

Do not be tempted to adjust the driven element (unless it has distorted in shipping). The Wimo DE is relatively fragile and it’s possible to break internal connections, or to compromise the weather seal.

 

It’s good fun adjusting aerials, especially when it is wet and windy outside………..

 

Good luck

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Ed G3VPF
Sent: 15 November 2019 12:06
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Wimo 13cms yagi

 

I recently purchased a Wimo SHF2344 44 ele 13cms yagi and an SG-Labs 13cms transverter hoping to be on for the contest at the weekend. However, the transverter shows an SWR warning light when feeding the yagi at 2320MHz. Using the built in directional coupler shows a VSWR at 2320 at 2:1, but better than 1.1:1 at 2332 MHz.

 

Can anyone offer advice on an adjustment I can make to the yagi to persuade the lower SWR down to 2320?

 

Ed

G3VPF IO80RQ


Re: Wimo 13cms yagi

John Lemay
 

Hello Ed

 

With almost all yagis, the position and length of the first director is critical, and sometimes in mass production things go adrift. You’re probably stuck with its position but you can experiment carefully by bending the tips of D1 closer to or further away from the driven element. You can also see – temporarily – the effect of lengthening the element by wrapping a bit of solver foil around each end.

 

Being 13cms, your adjustments will need to be in mm iterations.

 

Do not be tempted to adjust the driven element (unless it has distorted in shipping). The Wimo DE is relatively fragile and it’s possible to break internal connections, or to compromise the weather seal.

 

It’s good fun adjusting aerials, especially when it is wet and windy outside………..

 

Good luck

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Ed G3VPF
Sent: 15 November 2019 12:06
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Wimo 13cms yagi

 

I recently purchased a Wimo SHF2344 44 ele 13cms yagi and an SG-Labs 13cms transverter hoping to be on for the contest at the weekend. However, the transverter shows an SWR warning light when feeding the yagi at 2320MHz. Using the built in directional coupler shows a VSWR at 2320 at 2:1, but better than 1.1:1 at 2332 MHz.

 

Can anyone offer advice on an adjustment I can make to the yagi to persuade the lower SWR down to 2320?

 

Ed

G3VPF IO80RQ


Wimo 13cms yagi

Ed G3VPF
 

I recently purchased a Wimo SHF2344 44 ele 13cms yagi and an SG-Labs 13cms transverter hoping to be on for the contest at the weekend. However, the transverter shows an SWR warning light when feeding the yagi at 2320MHz. Using the built in directional coupler shows a VSWR at 2320 at 2:1, but better than 1.1:1 at 2332 MHz.

Can anyone offer advice on an adjustment I can make to the yagi to persuade the lower SWR down to 2320?

Ed

G3VPF IO80RQ


Lo Noise Voltage regulators

G8ZHA
 

I need to buy a low noise 3V3 voltage regulator, for a GPSDO. Preferably in a TO-92 case........has anyone got any suggestions?
Rich G8ZHA


Re: Dish Art

Nicholas Shaxted
 

Maybe I should throw this link into the expanding dish collection before it gets out of hand 😊

 

Down here in Far Sarf_Eest Ingerland we have a some concrete dishes – just to pleez Andi and qualify for inclusion on this thread they were TAgGeD by some unknow local artist.

 

All under the protection of the RSPB at Greatstone Lakes on Romney Marsh

Please look at https://theromneymarsh.net/soundmirrors

 

 

 

Mit freundlichen Grüßen, Com os melhores cumprimentos, 敬具

Le gach dea-ghuí. Venlig Hilsen, Distinti Saluti, مع جزيل الشكر و التقدير

 

73 de

Nick – g4ogi from JO01mg

 

brexit risu digna delenda est

 

You see things; and you say 'Why?' But I dream things that never were; and I say 'why not?' ~ George Bernard Shaw

 

 

 

 

From: UKMicrowaves@groups.io On Behalf Of Bob_G1ZJP via Groups.Io
Sent: Friday, November 15, 2019 9:40 AM
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dish Art

 

Here's a sample of Lincolnshire's contribution to the world of "Dish Art" ~ Photo copyright of Diane Seddon ARPS CPAGB BPE3*

Here's the BBC version of the story ~ 
https://www.bbc.co.uk/news/uk-england-lincolnshire-46058571 


73
Bob, G1ZJP

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