Date   

Re: Where is the focal point of an LNB?

Mike Willis
 

PS - 6 photos of the feed but not one of the actual dish? Given it is a tripod feed I would suggest you make the mount adjustable. Then you can optimise it in situ.
--
Mike G0MJW


Re: Where is the focal point of an LNB?

Mike Willis
 

Typically around the aperture but it would need a simulation - why not work out (or measure with mirrors and a laser pointer) the focal length?
--
Mike G0MJW


Where is the focal point of an LNB?

Chris Wilson
 

01/04/2021 12:18

I want to re-purpose an elderly pressed aluminium 1.8 metre dish last used for terrestrial satellite reception at my old house. I will initially use it for SSB RX / TX to es hail, although it's a bit overkill! My question is, on the attached link to photos of the old LNB, is the focal point the centre point on the innermost annular ring of the feed "horn" or is the the actual antenna deep within the gubbins? I need to fabricate a mount for a 10GHz LNB and a POTY TX antenna, and am not sure where to measure to. Thanks 2E0ILY

Pics are at http://www.chriswilson.tv/satellite/satellite.zip

--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv


Re: TCXO Donation

Michael Scott
 

Thanks Paul!

It looks a though it is a sort of frequency dependant variable attenuator!

73, Mike.

On 31/03/2021 19:45, Paul G8AQA via groups.io wrote:
Mike

https://www.minicircuits.com/pdfs/VAEQ-2150+.pdf

That is where I reduced my ignorance a little.

73
Paul


On 31/03/2021 19:35, Michael Scott via groups.io wrote:

OK Paul, I will send them to you when I get the form.

Thanks for the offer of the Mini Circuits parts,please excuse my ignorance, but what do they do?!!

73, Mike.

On 31/03/2021 12:54, Paul G8AQA via groups.io wrote:
Hi Mike,

I would like a couple of the TCXOs.  I will send you an order form.

I have a quantity of Mini Circuits VAEQ-2159 voltage variable equalisers.

50 ohm 950 to 2150 MHz with the variable slope.
I can't think of a use for them at the moment. I will donate 60 of them in due course but if anyone wants any now please get in touch direct.

73
Paul G8AQA.


On 31/03/2021 11:36, Michael Scott via groups.io wrote:
Hi All

The Chipbank has just received a donation of 25 Meiden 14.4MHz TCXOs from Paul G8AFC, for which many thanks!

About 10 years ago these were available on e-bay from Pyrojoseph in the USA. For the benefit of those who have joined the UKuG since then, these oscillators were reviewed in Scatterpoint, February/March 2011 by Bernie Wright, G4HJW, and formed the frequency source for the transmit version of the "Bernie Box", a low power 10GHz transmitter/signal source  ( http://www.earf.co.uk/txkit.html ). Although kits/PCBs are no longer available, these TCXOs can form the basis of a signal source for many of our bands from 144MHz up, and with a little modification, the tuning range can be increased considerably.

I will add them to the Chipbank catalogue at the next update, but in the meantime, please send an order form in the usual way.

73,

Mike, G3LYP.






http://www.earf.co.uk/txkit.html








Virus-free. www.avg.com


For Andrew . re ; Fet .......

Gordon REASON <gordonj.reason@...>
 


---------- Original Message ----------
From: Mail Delivery System <postmaster@...>
To: gordonj.reason@...
Date: 31 March 2021 at 23:55
Subject: Mail delivery failed : returned to sender


This message was created automatically by mail delivery software.

You sent the following message, but this message could not be delivered to all recipients:

======================================================================
Subject: Fet
------=_Part_930301_1908888434.1617231352905 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit I have some fets I brought home , from some poorly designed unit amplifiers ..... Do'nt know here they are at this time , but if my memory serves me right , they w
======================================================================

The following addresses failed:


andrew.gilfillan@...
host lb01.groups.io [45.79.81.153]
SMTP error from remote mail server after RCPT TO:<andrew.gilfillan@...>:
510 The group 'andrew.gilfillan=ntlworld.com' does not exist.


FET for BAO amp

G0FVI
 
Edited

Anyone got an mrf9060ls or equivalent for a g7ntg BAO clone amp they'd be willing to sell me?

Thanks

Andy G0FVI


Re: Wavelab 2W 24Ghz TRV

Marek Rejf
 

Hello all
In the link, the gerber and BOM files provided by Paweł SQ1GQC for ordering power supply modules assembled in JLCPCB.
More information at
: " http://mikrofale.cafe/showthread.php?tid=197 "

73 Marek SP4ELF


Re: TCXO Donation

Paul G8AQA
 

Mike

https://www.minicircuits.com/pdfs/VAEQ-2150+.pdf

That is where I reduced my ignorance a little.

73
Paul


On 31/03/2021 19:35, Michael Scott via groups.io wrote:

OK Paul, I will send them to you when I get the form.

Thanks for the offer of the Mini Circuits parts,please excuse my ignorance, but what do they do?!!

73, Mike.

On 31/03/2021 12:54, Paul G8AQA via groups.io wrote:
Hi Mike,

I would like a couple of the TCXOs.  I will send you an order form.

I have a quantity of Mini Circuits VAEQ-2159 voltage variable equalisers.

50 ohm 950 to 2150 MHz with the variable slope.
I can't think of a use for them at the moment. I will donate 60 of them in due course but if anyone wants any now please get in touch direct.

73
Paul G8AQA.


On 31/03/2021 11:36, Michael Scott via groups.io wrote:
Hi All

The Chipbank has just received a donation of 25 Meiden 14.4MHz TCXOs from Paul G8AFC, for which many thanks!

About 10 years ago these were available on e-bay from Pyrojoseph in the USA. For the benefit of those who have joined the UKuG since then, these oscillators were reviewed in Scatterpoint, February/March 2011 by Bernie Wright, G4HJW, and formed the frequency source for the transmit version of the "Bernie Box", a low power 10GHz transmitter/signal source  ( http://www.earf.co.uk/txkit.html ). Although kits/PCBs are no longer available, these TCXOs can form the basis of a signal source for many of our bands from 144MHz up, and with a little modification, the tuning range can be increased considerably.

I will add them to the Chipbank catalogue at the next update, but in the meantime, please send an order form in the usual way.

73,

Mike, G3LYP.






http://www.earf.co.uk/txkit.html








Virus-free. www.avg.com


Re: TCXO Donation

Michael Scott
 

OK Paul, I will send them to you when I get the form.

Thanks for the offer of the Mini Circuits parts,please excuse my ignorance, but what do they do?!!

73, Mike.

On 31/03/2021 12:54, Paul G8AQA via groups.io wrote:
Hi Mike,

I would like a couple of the TCXOs.  I will send you an order form.

I have a quantity of Mini Circuits VAEQ-2159 voltage variable equalisers.

50 ohm 950 to 2150 MHz with the variable slope.
I can't think of a use for them at the moment. I will donate 60 of them in due course but if anyone wants any now please get in touch direct.

73
Paul G8AQA.


On 31/03/2021 11:36, Michael Scott via groups.io wrote:
Hi All

The Chipbank has just received a donation of 25 Meiden 14.4MHz TCXOs from Paul G8AFC, for which many thanks!

About 10 years ago these were available on e-bay from Pyrojoseph in the USA. For the benefit of those who have joined the UKuG since then, these oscillators were reviewed in Scatterpoint, February/March 2011 by Bernie Wright, G4HJW, and formed the frequency source for the transmit version of the "Bernie Box", a low power 10GHz transmitter/signal source  ( http://www.earf.co.uk/txkit.html ). Although kits/PCBs are no longer available, these TCXOs can form the basis of a signal source for many of our bands from 144MHz up, and with a little modification, the tuning range can be increased considerably.

I will add them to the Chipbank catalogue at the next update, but in the meantime, please send an order form in the usual way.

73,

Mike, G3LYP.






http://www.earf.co.uk/txkit.html








Virus-free. www.avg.com


info about this amplifier

Oguzhan Kayhan
 

Hello all,

One of my friend got that amplifier as surplus..
I am just thinking about buying this from him but, first I need to be sure if this is something that I can use.
I googled some but couldnt find much info except ebay lists.

Does anybody have ssome information regarding to this device?

Wiltron X-BAND AMPLIFIER ND-19072 7.9-12.5GHz


73

--
73
de TA2NC


Re: TCXO Donation

Paul G8AQA
 

Hi Mike,

I would like a couple of the TCXOs.  I will send you an order form.

I have a quantity of Mini Circuits VAEQ-2159 voltage variable equalisers.

50 ohm 950 to 2150 MHz with the variable slope.
I can't think of a use for them at the moment. I will donate 60 of them in due course but if anyone wants any now please get in touch direct.

73
Paul G8AQA.


On 31/03/2021 11:36, Michael Scott via groups.io wrote:
Hi All

The Chipbank has just received a donation of 25 Meiden 14.4MHz TCXOs from Paul G8AFC, for which many thanks!

About 10 years ago these were available on e-bay from Pyrojoseph in the USA. For the benefit of those who have joined the UKuG since then, these oscillators were reviewed in Scatterpoint, February/March 2011 by Bernie Wright, G4HJW, and formed the frequency source for the transmit version of the "Bernie Box", a low power 10GHz transmitter/signal source  ( http://www.earf.co.uk/txkit.html ). Although kits/PCBs are no longer available, these TCXOs can form the basis of a signal source for many of our bands from 144MHz up, and with a little modification, the tuning range can be increased considerably.

I will add them to the Chipbank catalogue at the next update, but in the meantime, please send an order form in the usual way.

73,

Mike, G3LYP.






http://www.earf.co.uk/txkit.html








Virus-free. www.avg.com


Re: TCXO Donation

Michael Scott
 

H Conrad,

No mention of the phase noise in Bernies article except for a comment that the signal purity was good!  He does say that some of them were subject to frequency jumps.

Mike.

On 31/03/2021 12:02, Conrad, PA5Y wrote:
Hello Mike was the PN measured by anybody at the time?

Regards

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Michael Scott via groups.io <g3lyp@...>
Sent: 31 March 2021 12:36
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] TCXO Donation
 
Hi All

The Chipbank has just received a donation of 25 Meiden 14.4MHz TCXOs
from Paul G8AFC, for which many thanks!

About 10 years ago these were available on e-bay from Pyrojoseph in the
USA. For the benefit of those who have joined the UKuG since then, these
oscillators were reviewed in Scatterpoint, February/March 2011 by Bernie
Wright, G4HJW, and formed the frequency source for the transmit version
of the "Bernie Box", a low power 10GHz transmitter/signal source  (
http://www.earf.co.uk/txkit.html ). Although kits/PCBs are no longer
available, these TCXOs can form the basis of a signal source for many of
our bands from 144MHz up, and with a little modification, the tuning
range can be increased considerably.

I will add them to the Chipbank catalogue at the next update, but in the
meantime, please send an order form in the usual way.

73,

Mike, G3LYP.






http://www.earf.co.uk/txkit.html







Re: TCXO Donation

Conrad, PA5Y
 

Hello Mike was the PN measured by anybody at the time?

Regards

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Michael Scott via groups.io <g3lyp@...>
Sent: 31 March 2021 12:36
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] TCXO Donation
 
Hi All

The Chipbank has just received a donation of 25 Meiden 14.4MHz TCXOs
from Paul G8AFC, for which many thanks!

About 10 years ago these were available on e-bay from Pyrojoseph in the
USA. For the benefit of those who have joined the UKuG since then, these
oscillators were reviewed in Scatterpoint, February/March 2011 by Bernie
Wright, G4HJW, and formed the frequency source for the transmit version
of the "Bernie Box", a low power 10GHz transmitter/signal source  (
http://www.earf.co.uk/txkit.html ). Although kits/PCBs are no longer
available, these TCXOs can form the basis of a signal source for many of
our bands from 144MHz up, and with a little modification, the tuning
range can be increased considerably.

I will add them to the Chipbank catalogue at the next update, but in the
meantime, please send an order form in the usual way.

73,

Mike, G3LYP.






http://www.earf.co.uk/txkit.html







TCXO Donation

Michael Scott
 

Hi All

The Chipbank has just received a donation of 25 Meiden 14.4MHz TCXOs from Paul G8AFC, for which many thanks!

About 10 years ago these were available on e-bay from Pyrojoseph in the USA. For the benefit of those who have joined the UKuG since then, these oscillators were reviewed in Scatterpoint, February/March 2011 by Bernie Wright, G4HJW, and formed the frequency source for the transmit version of the "Bernie Box", a low power 10GHz transmitter/signal source  ( http://www.earf.co.uk/txkit.html ). Although kits/PCBs are no longer available, these TCXOs can form the basis of a signal source for many of our bands from 144MHz up, and with a little modification, the tuning range can be increased considerably.

I will add them to the Chipbank catalogue at the next update, but in the meantime, please send an order form in the usual way.

73,

Mike, G3LYP.






http://www.earf.co.uk/txkit.html


Re: Cleaning relay contacts

Stefan
 


Thanks Bob
 
for your explanation. I remember doing the soft pencil application once and it did work better for a short term, but using the adhesive silver paint seems a permanent fix
 
73 Stefan VK4CSD

----- Original Message -----
Sent: Wednesday, March 31, 2021 12:08 PM
Subject: Re: [UKMicrowaves] Cleaning relay contacts

From my observation and limited experience it appears to be leakage of the plasticiser as the flexible membrane ages and some of its components denature. The “gooey mess” (a technical term) is often difficult to remove and in doing so the conductive surface on the underside of the keys also suffers – sometimes applying a light coat of graphite from a 2B or other ‘soft’ pencil on these ‘contacts’ will work. In the case of remote controls, a replacement “programmable, universal” remote is the optimum solution.

73,

Bob VK6KW.

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Stefan
Sent: Tuesday, March 30, 2021 6:26 AM
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Cleaning relay contacts

 

dont know, maybe there is a minute build up of oxides or similar non contactive layer build up. I seen  it throughout all of those keyboard type button, test gear sufferes equally, my HP8563e is getting worse and worse and will need previous mentioned treatment.

 

Good Luck 73

----- Original Message -----

From: Chris G8BKE

Sent: Tuesday, March 30, 2021 7:37 AM

Subject: Re: [UKMicrowaves] Cleaning relay contacts

 

How come cleaning the button clears the problem for a while then?

73


Re: Cleaning relay contacts

Bob Lockley VK6KW
 

From my observation and limited experience it appears to be leakage of the plasticiser as the flexible membrane ages and some of its components denature. The “gooey mess” (a technical term) is often difficult to remove and in doing so the conductive surface on the underside of the keys also suffers – sometimes applying a light coat of graphite from a 2B or other ‘soft’ pencil on these ‘contacts’ will work. In the case of remote controls, a replacement “programmable, universal” remote is the optimum solution.

73,

Bob VK6KW.

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Stefan
Sent: Tuesday, March 30, 2021 6:26 AM
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Cleaning relay contacts

 

dont know, maybe there is a minute build up of oxides or similar non contactive layer build up. I seen  it throughout all of those keyboard type button, test gear sufferes equally, my HP8563e is getting worse and worse and will need previous mentioned treatment.

 

Good Luck 73

----- Original Message -----

Sent: Tuesday, March 30, 2021 7:37 AM

Subject: Re: [UKMicrowaves] Cleaning relay contacts

 

How come cleaning the button clears the problem for a while then?

73


Rodgers

Gordon REASON <gordonj.reason@...>
 

Lurking in my scrap is a sheet of Rogers duriod , double sided ......

about 8 inches square

The lable is a bit faded , but I can make out  D-5880

                                                           I think 2 oz copper

thickness , top to base on my vernier o.34 mm

Should be good for 24 and 47 Ghz , or higher ......

I'm not going to use it , so exchanged for crate of Hook Norton best Bitter ???? or similar ?


Re: Good 3cm tropo IO93 to IO80

G4LDR
 

On Monday evening, 29th March, GB3KBQ was the strongest I had ever heard it, 599 + a lot, (normally 529). I have a regular sked with Adrian G4UVZ on Monday evenings on 3cm. Signals were 59+++++ last night.

We had always said we would try DATV when conditions were good enough (been waiting for months). Last night we tried. We exchanged HD video (and sound) on 3cm at symbol rates up to 2,000kbits/s (i.e. about 2MHz bandwidth). The distance between us is just over 100km over an obstructed path.

73 Neil G4LDR.


Re: SDR UNO RSP 1 Problem

Adrian G4UVZ
 

Pleased to report that going into the SDRUNO program in the directory and deleting the history saved data ,,,has restored my SDR to its original splender

Thanks for the various advice

UVZ


Re: Hempt?

Stanislaw Ziemczonek
 

Ben, I can get you (free) a  few MGF4918D ,
73's de Staszek SP6GWB

Having bought a 10Ghz Hempt LNA I find its u/s. 
MGF4917D

What should I be looking for to replace the device? nothing on ebay. 

Ben



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