Date   

LNBs again ish

Richard <richard@...>
 

Hi
Has anyone played with the Sky Q LNBs, they are supposed to be wide
band from 230MHz to 2.4 GHz on the downlink.
If the lowest IF freq is around 230 MHz which on a traditional LNB
would be 950 MHz, and on Eshails2 the Narrow band seg is about 839 MHz
about 111 MHz lower, if we go 111 MHz LF of 230MHz , it doesn't get
close to 144 MHz

But considering if the lowest sat freq is mixed down to 230MHz , if
they use DROs that would require new puks to be cut thats expensive,
also if the LO is low side I think they would be slighly larger than
the 9750 MHz puks.
So as a PLL is a much cheaper way of producing a LO as they are made by
the bucketful and more stable than a DRO.
If it is a PLL I wonder how difficult to nudge it up to bring the bit
we are interested in within 144 -148 MHz.
Over that range of if the probability of quadrature down conversion is
much higher as well.
Has anyone ripped a Sky Q lnb apart, we could be missing something much
more useful ????
--
Best wishes /73
Richard Bown

Email : richard@g8jvm.com

HTTP : http://www.g8jvm.com

######################################################################

Ham Call: G8JVM . QRV: 50-432 MHz + Microwave
Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W
QRV 6mtrs 200W, 4mtrs 150W, 2mtrs 300W, 70cms 200W,
Microwave 1296MHz 140W, 2320MHz 100W & 10368MHz 5W
OS: Linux Mint 19.1 x86_64 Tessa, on a Dell Inspiron N5030 laptop
######################################################################


Re: Another Octagon LNB question

R Hopkins
 

Most satellite receivers switch between 13V (vertical) and 18V (horizontal);

Roger GW4NOS

On Fri, 1 Feb 2019 19:03:25 -0000, you wrote:

What is the minimum voltage needed to switch the LNB polarisation? Do I need 18V or will 15V do? If it is 18V how high can this voltage go?



Regards, Rich



Re: Waveguide switch replacement

John Fell
 

I am in Corfe Mullen , aprox  5 miles NW of Poole .
John
G0API

On Fri, 1 Feb 2019 at 15:20, Paul Bicknell <paul@...> wrote:

Hi Mike

Is that pool  I am in west Sussex

Paul B


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of John Fell
Sent: 01 February 2019 13:54
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Waveguide switch replacement

 

Approx location is IO80XS77JS .

 

73   John   G0API

 

On Fri, 1 Feb 2019 at 12:31, Paul Bicknell <paul@...> wrote:

Hi john

I think Mike and I have hade the same positive experience with using WG 22 at 24 Ghz 

Regarding spectrum analysers

Yes the 21 GHz    HP 8559 analysers work fine at 24GHz, as that is what I  used for the 24 ghz  FM  TV link I demonstrated at a BATC convention some 30 plus years ago

The old  HP 18 ghz  in the  140 main frame also works OK at 24 ghz using a WG 22 external mixer    

Regarding power measurements the WG 22  HP power sensors are useable at 24 Ghz  

Just as a side question what is your approximate location  

Paul B 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Mike Willis
Sent: 01 February 2019 11:52
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Waveguide switch replacement

WG22 is recommended for 26GHz-40GHz but it is still well above cut-off at 24GHz. I think the New Zealand relays  Iam using are WG22. I simply connected them together directly, by filing slots in the WG20 flange because the hole spacing is different. I used 3 fine screws to tune out the miss-match in the usual manner. It should work OK for narrow bandwidths. If you don't have a 24 GHz VSWR meter or VNA, just use a directional coupler and a sensitive detector (e.g. a spectrum analyser or a crystal detector). The old 22GHz HP8559 analysers work fine at 24GHz, they are un-calibrated but you are only looking for a null.
--
Mike G0MJW

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.

Paul Bicknell G8KFW   South Coast UK


Re: Octagon LNB

Brian Flynn GM8BJF
 

Hi Andy,
I spotted that bit a while back and found them quite useful at lower frquencies. I used one to make a GPS locked reference for my aging FT736R which had to be on 20.048 MHz which at first appeared to be awkward but then I remembered about  binary!
They are digital devices and as long as dv by dt is ok they should work. They can't depend on capacitive coupling inside!

73s Brian GM8BJF


Re: Waveguide switch replacement

John Fell
 

Thanks Chris ,
Will email Keith and see if he has the original data - spent a few Hrs hand cutting/drilling some flange blanks this afternoon from 6mm copper plate .
73 from the Dorset Snowfields ....err well about 25mm .

John
G0API

On Fri, 1 Feb 2019 at 15:10, Chris Bartram G4DGU <chris@...> wrote:
Hello John

I described a fixed, no amateur twiddle-fiddle, transition which does
exactly that - and can be made by hand - in Scatterpoint about a decade
ago. I believe that one or two people have duplicated it with good
results.  GW3TKF commented in conversation that his had achieved around
30dB RL. That concurs pretty well with my own measurements using a
(Cornish made!) Flann coupler, and load. The load shows around -37dB RL
btw with little sensitivity to load phase.

Like Mike I use one of the Relcom relays on 24 with WG20, and I have the
transition on all three ports. I see about 0.3dB IL for the combination
of the relay and transitions in both TX and RX. They are still in use,
currently mainly for /P operation, but I hope to resume my interrupted
work on 24EME later this year when the house is fully mangled!

73

Chris

G4DGU


On 01/02/2019 11:13, John Fell wrote:
> I have a defective WG20 switch and a working WG22 switch , both 4 port
> Ledex activated at 20V d.c.
> My question is , could I use the WG22 device on 24GHZ using suitable
> adaptors ?
> If so has anyone got any data on suitable adaptors ?
>
--
Chris Bartram
Luxulyan, Bodmin, Cornwall

chris@...





Re: Another Octagon LNB question

Richard <richard@...>
 

I had a look at the specs on a reg chip which is used as the supply for LNBs, and the upper limit
was quoted at 18.3V.
As most have found 16v is more that enough to switch over, the extra is probably to allow for long runs of grotty coax and the voltage drop
on it, the LNB gain covers the coax loss.
Richard

On Fri, 2019-02-01 at 19:03 +0000, g8zha via Groups.Io wrote:

What is the minimum voltage needed to switch the LNB polarisation? Do I need 18V or will 15V do? If it is 18V how high can this voltage go?

 

Regards, Rich


Re: Another Octagon LNB question

Mike Willis
 

Typically they have an SMD 78L06 regulator in them. That's what limits the maximum and minimum. 8V to 30V on the data sheet.

The current is of the order of 100mA so it won't be long before it gets too hot if you put more than 18V into it.

--
Mike G0MJW


Re: Another Octagon LNB question

Adrian G4UVZ
 

Mine changes over at around 14.5 volts.......I use one on a cross town wb link to another amateur ,,,I run most of my shack systems on PV / wind charged 12volt system... A few months ago I was listening on 10GHz when the signal suddenly dropped by a number of dB  then it came back again, then disappeared ...seemed to come and go with the wind !!! there's a clue here ..the wind turbine was pushing up the  volts and changing the polarity!!!

Adrian  ----Original message----
From : g8zha-1@...
Date : 01/02/2019 - 19:03 (GMT)
To : UKMicrowaves@groups.io
Subject : [UKMicrowaves] Another Octagon LNB question

What is the minimum voltage needed to switch the LNB polarisation? Do I need 18V or will 15V do? If it is 18V how high can this voltage go?

 

Regards, Rich




Re: Another Octagon LNB question

Mike Willis
 

About 16V unless you modify it.
--
Mike G0MJW


Re: Another Octagon LNB question

Andy G4JNT
 

Mine switches at 15.6V (by coincidence, checked it just this afternoon)
The low voltage lower limit seems to be around 7.8V - so I guess 9V operation would be fine.  Which allows for a current limiter to be fitted in the DC feed, as I just burned put an SMT choke when briefly shorting the coax.



On Fri, 1 Feb 2019 at 19:01, g8zha via Groups.Io <g8zha-1=blueyonder.co.uk@groups.io> wrote:

What is the minimum voltage needed to switch the LNB polarisation? Do I need 18V or will 15V do? If it is 18V how high can this voltage go?

 

Regards, Rich


Another Octagon LNB question

G8ZHA
 

What is the minimum voltage needed to switch the LNB polarisation? Do I need 18V or will 15V do? If it is 18V how high can this voltage go?

 

Regards, Rich


OT: how your cat can buy to a Octagon dual LNB

Richard <richard@...>
 

Don't start a thread on this as certain people get very peeed off
If you have a cat, P@H have dropped their prices enough for ten 12packs
of certain pouches saves enough to buy an Octagon LNB, only for a short
time. so no excuse not the listen to Eshails2 :)
Dogs can buy you one as well :)

--
Best wishes /73
Richard Bown

Email : richard@g8jvm.com

HTTP : http://www.g8jvm.com

######################################################################

Ham Call: G8JVM . QRV: 50-432 MHz + Microwave
Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W
QRV 6mtrs 200W, 4mtrs 150W, 2mtrs 300W, 70cms 200W,
Microwave 1296MHz 140W, 2320MHz 100W & 10368MHz 5W
OS: Linux Mint 19.1 x86_64 Tessa, on a Dell Inspiron N5030 laptop
######################################################################


Re: 13cms interdigital filter

alwyn.seeds1
 

Dear John,

Your fellow Countryman PE1RKI sells a 23cm filter that would meet your needs.

Beautifully made and I measure < 0.2 dB passband loss on my samples.

Regards,

Alwyn
 
_____________________________________________________

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

Tel.: +44 (0) 20 7376 4110


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


Re: 13cms interdigital filter

Pete - GM4BYF
 

Start with the VK3UM software at http://vk3um.com/interdigital%20filter.html

See also http://www.w6pql.com/ with examples of 23cm and 13cm filters

73
Pete GM4BYF
On 01/02/19 17:36, John Lambo wrote:

Yes i am also interested in this.
I have try to make a filter for 23cm what i can use form 1250mhz upt to 1310mhz.
But no result i have a dip at 1280mhz at about 7 db with a 4 pole filter.
So if anyone have a good program to calculate a interdigital filter that wil be nice...

73  John  PA7JB



Op 1-2-2019 om 12:44 schreef Martin G8BHC:
Yes please, Ferdinand.
Perhaps I might republish in Scatterpoint (english translation)?
73
Martin RH G8BHC

On 1 Feb 2019, at 08:35, Ferdinand DC8EC <dc8ec@...> wrote:

Good morning all,

In 1980 I held a lecture at the VHF / UHF conference in Munich on the simple calculation of interdigital filters. Insertion losses of 0.3 dB are no problem. Another advantage is the coupling and decoupling at the 50 ohm point of the first and last resonator. If anyone is interested, I can publish the lecture (in German) at this point.


--
Martin RH G8BHC



--
vry 73
Pete GM4BYF


Re: 13cms interdigital filter

John Lambo
 

Yes i am also interested in this.
I have try to make a filter for 23cm what i can use form 1250mhz upt to 1310mhz.
But no result i have a dip at 1280mhz at about 7 db with a 4 pole filter.
So if anyone have a good program to calculate a interdigital filter that wil be nice...

73  John  PA7JB



Op 1-2-2019 om 12:44 schreef Martin G8BHC:

Yes please, Ferdinand.
Perhaps I might republish in Scatterpoint (english translation)?
73
Martin RH G8BHC

On 1 Feb 2019, at 08:35, Ferdinand DC8EC <dc8ec@...> wrote:

Good morning all,

In 1980 I held a lecture at the VHF / UHF conference in Munich on the simple calculation of interdigital filters. Insertion losses of 0.3 dB are no problem. Another advantage is the coupling and decoupling at the 50 ohm point of the first and last resonator. If anyone is interested, I can publish the lecture (in German) at this point.


--
Martin RH G8BHC



Re: Octagon LNB

Andy G4JNT
 

Ah, didn't read the data sheet properly.    Spotted now that it quotes "For lower frequencies, ensure SR > 130 V/μs."   (SR = slew rate)

For a 0/5V logic input that corresponds to a rise time <38ns which is no big deal using a 74ACxx driver



On Fri, 1 Feb 2019 at 17:05, Andy G4JNT via Groups.Io <andy.g4jnt=gmail.com@groups.io> wrote:
The ADF4113 is specified for Fmin of 200MHz.   How have you made it work with 27MHz input.

I'm guessing by using a square wave and the internal dividers are static logic, so if clocked properly will go down to DC

Even the lowest frequency variant of that family, the ADF4110, only goes down to 800MHz officially.  
May have missed a trick here;  I've quite recently been bemoaning the fact modern synth chips can't go particularly low in frequency



On Fri, 1 Feb 2019 at 16:49, brian.flynn via Groups.Io <brian.flynn=tiscali.co.uk@groups.io> wrote:
Hi Mike,
I have taken the 27 MHz xtal out of my octagon and made an external input using the second F-tyle socke as described by Bernie 'HJW.
I have a waterproof box externally which contains a 27 MHz VCXO based on a varactor tuned Colpitts osc which I have locked to 12.8 MHz ex-cellphone
TCXO.  The PLL uses an ADF4113 with a band width of about 10 Hz. I feed about +10 dbm into the  LNB.  The water proof box with the PLL conrtains a Bias Tee to draw the DC off the LNB feed to power the PLL  I am powering the LNB/dish from a cheapo freesat box which allows Polarisation switching and Hi/Lo band switching.
A byproduct of it is I now get Sat TV as the 60 CM dish I am using is wide enought to pick Astra as well!! The 10706 MHz beacon is about 25 db out of the noise.  There is still a slow drift with temperature but it is only a couple of kHz and I can live with that until I find a better TCXO.

73s
Brian GM8BJF


Re: Octagon LNB

Andy G4JNT
 

The ADF4113 is specified for Fmin of 200MHz.   How have you made it work with 27MHz input.

I'm guessing by using a square wave and the internal dividers are static logic, so if clocked properly will go down to DC

Even the lowest frequency variant of that family, the ADF4110, only goes down to 800MHz officially.  
May have missed a trick here;  I've quite recently been bemoaning the fact modern synth chips can't go particularly low in frequency



On Fri, 1 Feb 2019 at 16:49, brian.flynn via Groups.Io <brian.flynn=tiscali.co.uk@groups.io> wrote:
Hi Mike,
I have taken the 27 MHz xtal out of my octagon and made an external input using the second F-tyle socke as described by Bernie 'HJW.
I have a waterproof box externally which contains a 27 MHz VCXO based on a varactor tuned Colpitts osc which I have locked to 12.8 MHz ex-cellphone
TCXO.  The PLL uses an ADF4113 with a band width of about 10 Hz. I feed about +10 dbm into the  LNB.  The water proof box with the PLL conrtains a Bias Tee to draw the DC off the LNB feed to power the PLL  I am powering the LNB/dish from a cheapo freesat box which allows Polarisation switching and Hi/Lo band switching.
A byproduct of it is I now get Sat TV as the 60 CM dish I am using is wide enought to pick Astra as well!! The 10706 MHz beacon is about 25 db out of the noise.  There is still a slow drift with temperature but it is only a couple of kHz and I can live with that until I find a better TCXO.

73s
Brian GM8BJF


Re: Octagon LNB

Brian Flynn GM8BJF
 

Hi Mike,
I have taken the 27 MHz xtal out of my octagon and made an external input using the second F-tyle socke as described by Bernie 'HJW.
I have a waterproof box externally which contains a 27 MHz VCXO based on a varactor tuned Colpitts osc which I have locked to 12.8 MHz ex-cellphone
TCXO.  The PLL uses an ADF4113 with a band width of about 10 Hz. I feed about +10 dbm into the  LNB.  The water proof box with the PLL conrtains a Bias Tee to draw the DC off the LNB feed to power the PLL  I am powering the LNB/dish from a cheapo freesat box which allows Polarisation switching and Hi/Lo band switching.
A byproduct of it is I now get Sat TV as the 60 CM dish I am using is wide enought to pick Astra as well!! The 10706 MHz beacon is about 25 db out of the noise.  There is still a slow drift with temperature but it is only a couple of kHz and I can live with that until I find a better TCXO.

73s
Brian GM8BJF


Re: Waveguide switch replacement

Paul G8KFW
 

Hi Mike

Is that pool  I am in west Sussex

Paul B


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of John Fell
Sent: 01 February 2019 13:54
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Waveguide switch replacement

 

Approx location is IO80XS77JS .

 

73   John   G0API

 

On Fri, 1 Feb 2019 at 12:31, Paul Bicknell <paul@...> wrote:

Hi john

I think Mike and I have hade the same positive experience with using WG 22 at 24 Ghz 

Regarding spectrum analysers

Yes the 21 GHz    HP 8559 analysers work fine at 24GHz, as that is what I  used for the 24 ghz  FM  TV link I demonstrated at a BATC convention some 30 plus years ago

The old  HP 18 ghz  in the  140 main frame also works OK at 24 ghz using a WG 22 external mixer    

Regarding power measurements the WG 22  HP power sensors are useable at 24 Ghz  

Just as a side question what is your approximate location  

Paul B 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Mike Willis
Sent: 01 February 2019 11:52
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Waveguide switch replacement

WG22 is recommended for 26GHz-40GHz but it is still well above cut-off at 24GHz. I think the New Zealand relays  Iam using are WG22. I simply connected them together directly, by filing slots in the WG20 flange because the hole spacing is different. I used 3 fine screws to tune out the miss-match in the usual manner. It should work OK for narrow bandwidths. If you don't have a 24 GHz VSWR meter or VNA, just use a directional coupler and a sensitive detector (e.g. a spectrum analyser or a crystal detector). The old 22GHz HP8559 analysers work fine at 24GHz, they are un-calibrated but you are only looking for a null.
--
Mike G0MJW

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.

Paul Bicknell G8KFW   South Coast UK

_._,_._,_

 


--
Paul Bicknell G8KFW   South Coast UK


Re: Wanted HP 432 B digital power meter

Steve - WB0DBS
 

Paul,

No response from you regarding the keyboards and Hughes mmwave sweeper manual?

Steve
WB0DBS



On Jan 31, 2019, at 9:34 PM, Paul Bicknell <paul@...> wrote:

Hi all I am looking for a HP 432 B power meter this is the digital version of the 432 A analogue version

If you have one I will part exchange for an analogue unit  with appropriate adjustment

 

Also looking for components and wave guide above 100Ghz

Regards Paul B

 

 

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK

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