Date   

Tuesday 3.4GHz

John Worsnop
 

Hi folks,
I plan to be QRV on 9 (and 3cm) for the last 30 minutes or so of Tuesday night's SHF UKAC contest. (maybe earlier if condx are up)
Look for me on KST if you'd like a try.

70W to 60cm dish, JO02CG on 9cm

73
John


Re: 13cm on Sunday?

Robin Szemeti - G1YFG
 

If I get enough bits of mine bolted together, I'll be on.  You'll hear me ;)   I'm trying to decide between running 50W in the restricted or 170W in Open ... not sure which will net more points.

I may be out /P on Sunday night checking out a new site ...

On Sat, 19 Sep 2020 at 20:22, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Hi Mark. 

North no good from here, big hill in the way, hi.


Ben. 



Subject: Re: [UKMicrowaves] 13cm on Sunday?

Ben
look on the Sota activity pages,   there has been quite a bit of 13cm activity in the last few days from GM  good weather gets people on summits
Mark GM4ISM
I have made some mods to my 13cm system and want to try it before Tuesday. 

Anyone around tomorrow for a sked? Can watch KST.   11:30 ish, will be messing from about 11:30 till 2 or so, need to watch the TDF finale. 

Ben G4BXD IO82UJ


--
Robin Szemeti - G1YFG


Re: 13cm on Sunday?

militaryoperator
 

Hi Mark. 

North no good from here, big hill in the way, hi.


Ben. 



Subject: Re: [UKMicrowaves] 13cm on Sunday?

Ben
look on the Sota activity pages,   there has been quite a bit of 13cm activity in the last few days from GM  good weather gets people on summits
Mark GM4ISM
I have made some mods to my 13cm system and want to try it before Tuesday. 

Anyone around tomorrow for a sked? Can watch KST.   11:30 ish, will be messing from about 11:30 till 2 or so, need to watch the TDF finale. 

Ben G4BXD IO82UJ


Re: 13cm on Sunday?

Mark GM4ISM
 

Ben

look on the Sota activity pages,   there has been quite a bit of 13cm activity in the last few days from GM  good weather gets people on summits

Mark GM4ISM

On 19/09/2020 20:02, militaryoperator via groups.io wrote:

I have made some mods to my 13cm system and want to try it before Tuesday. 

Anyone around tomorrow for a sked? Can watch KST.   11:30 ish, will be messing from about 11:30 till 2 or so, need to watch the TDF finale. 

Ben G4BXD IO82UJ

Virus-free. www.avg.com


Re: Wanted SMA/N-type to WG16 transitions

John Lambo
 

Hello Neil,
I also sent you a mail but no reply?


73  John  PA7JB


Op 18-9-2020 om 18:29 schreef Neil Smith G4DBN:

Hi Mike, I replied direct before, so I guess it must have been blocked somewhere.  I suspect there are spammers using the same server farm where my hosting provider runs my email and web service, so my mails do get blocked by some providers from time to time. Hope this reaches you OK.

I'll take you off the order list for the transitions.   Replying direct and on the forum just to be sure.

I'll be making up a batch of SMA to WR90 transitions over the weekend, as I've now received the 8 mm radiused-corner centre cutting three-flute carbide slot drills from Cutwel.

Neil G4DBN

On 18/09/2020 16:42, Mike Webb wrote:
Not sure whats happened here but I sent you an email direct asking for two of the WG16 transitions complete. Ive found some dont send because of spam blocks so Im replying on Groups

Appreciate a direct reply if possible


TIA
--
Mike GD6ICR IO74PF73TW


13cm on Sunday?

militaryoperator
 


I have made some mods to my 13cm system and want to try it before Tuesday. 

Anyone around tomorrow for a sked? Can watch KST.   11:30 ish, will be messing from about 11:30 till 2 or so, need to watch the TDF finale. 

Ben G4BXD IO82UJ


Re: 10 GHz duct into Denmark coming south?

Stanislaw Ziemczonek
 

Neil,
today conditions hold in the direction OZ,
OZ7IGY good copy on 23 , 13, 6 and 3 cm , but no activity on the band and ON4KST...
73's de Staszek SP6GWB

Very pleased you made it Staszek. I failed to complete with OZ7Z, my entry to the duct closed before we exchanged reports.

I will be on tomorrow!

73 Neil G4DBN

-------- Original message --------
From: Stanislaw Ziemczonek <sp6gwb@...>
Date: 18/09/2020 23:01 (GMT+00:00)
Subject: Re: [UKMicrowaves] 10 GHz duct into Denmark coming south?

 Neil , you right, worked OZ7Z and OZ2OE on 3 cm tonight.
The signals were stronger then on 23 cm !
73's de Staszek SP6GWB (JO80JG)

> I was hearing OZ5UHF on 3cm very loud an hour ago, just had an easy
> contact on the band with OZ2OE, but I think the duct is moving south,
> DB0VC on 3cm came up quite strong for a while, but I'm losing that
> now. Might be dipping south.
>
> Neil G4DBN
> http://g4dbn.uk
>
>
>
>
>
>








Re: 10 GHz duct into Denmark coming south?

Neil Smith G4DBN
 

Very pleased you made it Staszek. I failed to complete with OZ7Z, my entry to the duct closed before we exchanged reports.

I will be on tomorrow!

73 Neil G4DBN

-------- Original message --------
From: Stanislaw Ziemczonek <sp6gwb@...>
Date: 18/09/2020 23:01 (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 10 GHz duct into Denmark coming south?

 Neil , you right, worked OZ7Z and OZ2OE on 3 cm tonight.
The signals were stronger then on 23 cm !
73's de Staszek SP6GWB (JO80JG)

> I was hearing OZ5UHF on 3cm very loud an hour ago, just had an easy
> contact on the band with OZ2OE, but I think the duct is moving south,
> DB0VC on 3cm came up quite strong for a while, but I'm losing that
> now. Might be dipping south.
>
> Neil G4DBN
> http://g4dbn.uk
>
>
>
>
>
>







Re: 10 GHz duct into Denmark coming south?

Stanislaw Ziemczonek
 

Neil , you right, worked OZ7Z and OZ2OE on 3 cm tonight.
The signals were stronger then on 23 cm !
73's de Staszek SP6GWB (JO80JG)

I was hearing OZ5UHF on 3cm very loud an hour ago, just had an easy contact on the band with OZ2OE, but I think the duct is moving south, DB0VC on 3cm came up quite strong for a while, but I'm losing that now. Might be dipping south.

Neil G4DBN
http://g4dbn.uk





10 GHz duct into Denmark coming south?

Neil Smith G4DBN
 

I was hearing OZ5UHF on 3cm very loud an hour ago, just had an easy contact on the band with OZ2OE, but I think the duct is moving south, DB0VC on 3cm came up quite strong for a while, but I'm losing that now. Might be dipping south.

Neil G4DBN
http://g4dbn.uk


Re: Wanted SMA/N-type to WG16 transitions

Neil Smith G4DBN
 

Hi Mike, I replied direct before, so I guess it must have been blocked somewhere.  I suspect there are spammers using the same server farm where my hosting provider runs my email and web service, so my mails do get blocked by some providers from time to time. Hope this reaches you OK.

I'll take you off the order list for the transitions.   Replying direct and on the forum just to be sure.

I'll be making up a batch of SMA to WR90 transitions over the weekend, as I've now received the 8 mm radiused-corner centre cutting three-flute carbide slot drills from Cutwel.

Neil G4DBN

On 18/09/2020 16:42, Mike Webb wrote:
Not sure whats happened here but I sent you an email direct asking for two of the WG16 transitions complete. Ive found some dont send because of spam blocks so Im replying on Groups

Appreciate a direct reply if possible


TIA
--
Mike GD6ICR IO74PF73TW


Re: Wanted SMA/N-type to WG16 transitions

Mike GD6ICR
 

Not sure whats happened here but I sent you an email direct asking for two of the WG16 transitions complete. Ive found some dont send because of spam blocks so Im replying on Groups

Appreciate a direct reply if possible


TIA
--
Mike GD6ICR IO74PF73TW


Re: QO-100 Tomorrow

Nick Gregory G0HIK
 

Many Thanks to all for a very nice QO-100 SOTA activation, I really appreciate people coming on to work me.

13 contacts in the Log and only one CQ call required. I got my first International Summit to Summit contact today, with Chris DL1CR/P.

I hoping to operate from Dent Fell, N.W. Lake district tomorrow from around 10:30 UTC.

Nick G0HIK


Re: Ground noise on 23cm?

Andy G4JNT
 

Messages in this thread are continually being diverted to my Spam folder, from which I have to declare each one as being Not Spam.  
It's because of the link to G4ZTR's site [now deleted in this 'reply to'] that is being repeated in all replies.

When you reply to a message, to prevent rapid growth, why not just delete all quoted text except for the sentence or two that says what you're referring to.



Re: Ground noise on 23cm?

Paul G8AQA
 

I had a lot of wideband noise particularly in one direction. I temporarily put in a switchable bandpass filter before the Bulgarian SG Lab masthead preamp. In the worst direction the drop in background noise with the filter in was about 24dB.  It is now in permanently.  It was a surplus silver plated interdigital filter that I modified to increase the frequency.  The loss was too small to measure reliably.

Paul G8AQA


G4
DBN wrote:

I've used one of John's filters for ages. Through loss is tiny, something around 0.15dB increase in NF when I put it in front of a DDK preamp on my HP8970B compared with an SMA barrel connector.

I am 51km LOS from Emley Moor and there are no cellphone masts within 2km, but the problem was severe. I had about 15 noise spikes in many directions before I added the interdigital filter. It has SMA connectors.

http://www.g4ztr.co.uk/amateur-radio/23cms/

Neil G4DBN


On 17/09/2020 10:05, Anthony Coldman via groups.io wrote:

Morning all

 

I would agree with others that a filter in front of a preamp is an almost must now, I have built ones for 23cm and 13cm using the information on this site and the difference is night and day, If you prefer to buy you can also have a look at PE1RKI site he produces nice filters as well.

 

Regards

 

Anthony G7LRQ




Re: Ground noise on 23cm?

Neil Smith G4DBN
 

I've used one of John's filters for ages. Through loss is tiny, something around 0.15dB increase in NF when I put it in front of a DDK preamp on my HP8970B compared with an SMA barrel connector.

I am 51km LOS from Emley Moor and there are no cellphone masts within 2km, but the problem was severe. I had about 15 noise spikes in many directions before I added the interdigital filter. It has SMA connectors.

http://www.g4ztr.co.uk/amateur-radio/23cms/

Neil G4DBN


On 17/09/2020 10:05, Anthony Coldman via groups.io wrote:

Morning all

 

I would agree with others that a filter in front of a preamp is an almost must now, I have built ones for 23cm and 13cm using the information on this site and the difference is night and day, If you prefer to buy you can also have a look at PE1RKI site he produces nice filters as well.

 

Regards

 

Anthony G7LRQ



Re: Ground noise on 23cm?

Anthony Coldman
 

Morning all

 

I would agree with others that a filter in front of a preamp is an almost must now, I have built ones for 23cm and 13cm using the information on this site and the difference is night and day, If you prefer to buy you can also have a look at PE1RKI site he produces nice filters as well.

 

Regards

 

Anthony G7LRQ

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of John Lemay
Sent: 17 September 2020 07:49
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ground noise on 23cm?

 

Morning all

 

I completely agree with Richard’s analysis of the likely cause of interference on 23cms. My QTH is line of sight with the Sudbury TV transmitter, and it gave me lots of grief until I introduced a bandpass filter. A notch filter at 650MHz provided an element of improvement and indicated I was on the right track.

 

You can read about my findings at http://www.g4ztr.co.uk/amateur-radio/23cms/ , just scroll down past the yagi info.

 

Maybe I can use this mail as a thinly disguised commercial for my own interdigital filter, which can be found at www.aerial-parts.co.uk. Quite a few of these are in use around the country and I’ve yet to hear of anyone who has not been able to improve reception.

 

Regards

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Colin Ranson
Sent: 16 September 2020 23:09
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ground noise on 23cm?

 

Hi all,

 

I have a filter designed by G3XDY plumbed into my system after the amplifier.     https://www.qsl.net/g3xdy/QRO%2023cm%20Harmonic%20Filter%20and%20Reflectometer.htm

 

On RX I have an (almost) mast head pre-amp (located in loft, with the amplifier, under the antenna outside, a Tonna 35ele that seems to be intermittent at times so something else is needed). The pre-amp has an onboard hairpin bandpass filter and this also feeds an interdigital filter which connects via 30ft of coax to the SG Labs transverter.   Other than radar pulses I have never noticed any unusual noise from any direction – even with a well loaded water tower only 400 yards away. Mind you not saying this won’t change when I get a decent antenna up there.

 

Regards to all,

 

Colin de G8LBS.

 

 

 

 

 

Sent from Mail for Windows 10

 

From: Richard GD8EXI
Sent: 16 September 2020 22:27
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ground noise on 23cm?

 

I doubt it can be ground noise if it is S5. On 23cms you are unlikely to see more than 3dB change in noise, between beaming into a hillside and beaming down hill. The antenna noise temp going from say 100 to 200K, so even with a RX noise temperature of 50K, only expect a 2.2dB difference.
 
As Andy stated more likely the presence of one or more very strong signals, mixing in your RX at the /P location.
 
Another common culprit is a DTV transmitter centred on about 650MHz. The intermodulation products look like white noise in a 3kHz bandwidth on 1296MHz. Also do not assume your beam will tell you where the source is, as the polar diagram will look very different on 650MHz.
 
Best test is a good 1296MHz bandpass filter in front of any amplification. The trouble is the path loss of about 1dB. I use a 650MHz notch filter in front of my masthead preamp and an interdigital one after it. The noise floor drops by 10dB on some beam headings, on adding this combination, even after correcting for insertion loss.

73s
Richard
GD8EXI




On 16/09/2020, 20:20, "Andy G4JNT" <andy.g4jnt@...> wrote:

The product is 2160MHz  [which is on the edge of a 3G channel]  -   2 x 1152 [LO]  =  144MHz

Andy
www.g4jnt.com <http://www.g4jnt.com>



On Wed, 16 Sep 2020 at 20:18, Andy Talbot <andy.g4jnt@...> wrote:

If you're using aa 144MHz IF, there's a chance you're seeing IM products between your mixer LO and one of the 3G base station channels.   I'd have to look up the channel that cases the problems, but it was bad here until I added an additional filter in the Rx chain

Andy
www.g4jnt.com <http://www.g4jnt.com>



On Wed, 16 Sep 2020 at 20:13, G0FVI via groups.io <http://groups.io>  <Andrew.gilfillan@...> wrote:

I'm still learning being relatively new to uwaves so apologies if this question seems a bit 'dumb'. I'm noticing fairly high noise levels on 23cm UKAC from my /P location (S5) but it's not constant in all directions and tails off to zero in several directions particularly due east to the continent (ground slope away to east and there are no obvious nearby man made sources of noise although there are HT pylons about 100 yards away). I'm not getting this at home with the same setup mounted on mast at about 35 feet (/P mast is only 20 feet), so I'm guessing it is perhaps ground noise? 

Andy G0FVI

 

 

 

Virus-free. www.avg.com


Re: Ground noise on 23cm?

John Lemay
 

Morning all

 

I completely agree with Richard’s analysis of the likely cause of interference on 23cms. My QTH is line of sight with the Sudbury TV transmitter, and it gave me lots of grief until I introduced a bandpass filter. A notch filter at 650MHz provided an element of improvement and indicated I was on the right track.

 

You can read about my findings at http://www.g4ztr.co.uk/amateur-radio/23cms/ , just scroll down past the yagi info.

 

Maybe I can use this mail as a thinly disguised commercial for my own interdigital filter, which can be found at www.aerial-parts.co.uk. Quite a few of these are in use around the country and I’ve yet to hear of anyone who has not been able to improve reception.

 

Regards

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Colin Ranson
Sent: 16 September 2020 23:09
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ground noise on 23cm?

 

Hi all,

 

I have a filter designed by G3XDY plumbed into my system after the amplifier.     https://www.qsl.net/g3xdy/QRO%2023cm%20Harmonic%20Filter%20and%20Reflectometer.htm

 

On RX I have an (almost) mast head pre-amp (located in loft, with the amplifier, under the antenna outside, a Tonna 35ele that seems to be intermittent at times so something else is needed). The pre-amp has an onboard hairpin bandpass filter and this also feeds an interdigital filter which connects via 30ft of coax to the SG Labs transverter.   Other than radar pulses I have never noticed any unusual noise from any direction – even with a well loaded water tower only 400 yards away. Mind you not saying this won’t change when I get a decent antenna up there.

 

Regards to all,

 

Colin de G8LBS.

 

 

 

 

 

Sent from Mail for Windows 10

 

From: Richard GD8EXI
Sent: 16 September 2020 22:27
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ground noise on 23cm?

 

I doubt it can be ground noise if it is S5. On 23cms you are unlikely to see more than 3dB change in noise, between beaming into a hillside and beaming down hill. The antenna noise temp going from say 100 to 200K, so even with a RX noise temperature of 50K, only expect a 2.2dB difference.
 
As Andy stated more likely the presence of one or more very strong signals, mixing in your RX at the /P location.
 
Another common culprit is a DTV transmitter centred on about 650MHz. The intermodulation products look like white noise in a 3kHz bandwidth on 1296MHz. Also do not assume your beam will tell you where the source is, as the polar diagram will look very different on 650MHz.
 
Best test is a good 1296MHz bandpass filter in front of any amplification. The trouble is the path loss of about 1dB. I use a 650MHz notch filter in front of my masthead preamp and an interdigital one after it. The noise floor drops by 10dB on some beam headings, on adding this combination, even after correcting for insertion loss.

73s
Richard
GD8EXI




On 16/09/2020, 20:20, "Andy G4JNT" <andy.g4jnt@...> wrote:

The product is 2160MHz  [which is on the edge of a 3G channel]  -   2 x 1152 [LO]  =  144MHz

Andy
www.g4jnt.com <http://www.g4jnt.com>



On Wed, 16 Sep 2020 at 20:18, Andy Talbot <andy.g4jnt@...> wrote:

If you're using aa 144MHz IF, there's a chance you're seeing IM products between your mixer LO and one of the 3G base station channels.   I'd have to look up the channel that cases the problems, but it was bad here until I added an additional filter in the Rx chain

Andy
www.g4jnt.com <http://www.g4jnt.com>



On Wed, 16 Sep 2020 at 20:13, G0FVI via groups.io <http://groups.io>  <Andrew.gilfillan@...> wrote:

I'm still learning being relatively new to uwaves so apologies if this question seems a bit 'dumb'. I'm noticing fairly high noise levels on 23cm UKAC from my /P location (S5) but it's not constant in all directions and tails off to zero in several directions particularly due east to the continent (ground slope away to east and there are no obvious nearby man made sources of noise although there are HT pylons about 100 yards away). I'm not getting this at home with the same setup mounted on mast at about 35 feet (/P mast is only 20 feet), so I'm guessing it is perhaps ground noise? 

Andy G0FVI

 

 


Virus-free. www.avg.com


Denis G3UVR SK - Funeral Details

Bob_G1ZJP
 

For those who wish to attend or want to remember Denis, here are his funeral details -

The funeral will be at Landican Cemetery, Wirral.  CH49 5LW at 10.30 am on Monday 21st September

and then afterwards at the Cherry Orchard over the road from the Cemetery entrance.

 

Numbers are restricted in the Chapel and while there are currently a few spaces available

please do not be offended if you arrive and do not get access to the Chapel.

 

The service will also be webcast and logon details are as follows:-

 

Log on to  -  https://www.wesleymedia.co.uk/webcast-view

(A Chrome browser is recommended)

 

Log-in  /  Order  ID:  48292

Password       zmphaujg

 

Full instructions are also available by clicking on pdf file

 

Flowers can be sent to Grange House, 87 Pensby Road, Heswall, CH60 7RB

 to arrive no later than 9.30am on the 21st

 

Donations to North Wirral Cats Protection - https://www.cats.org.uk/north-wirral



Bob, G1ZJP / M1MHZ


Re: Ground noise on 23cm?

Colin Ranson
 

Hi all,

 

I have a filter designed by G3XDY plumbed into my system after the amplifier.     https://www.qsl.net/g3xdy/QRO%2023cm%20Harmonic%20Filter%20and%20Reflectometer.htm

 

On RX I have an (almost) mast head pre-amp (located in loft, with the amplifier, under the antenna outside, a Tonna 35ele that seems to be intermittent at times so something else is needed). The pre-amp has an onboard hairpin bandpass filter and this also feeds an interdigital filter which connects via 30ft of coax to the SG Labs transverter.   Other than radar pulses I have never noticed any unusual noise from any direction – even with a well loaded water tower only 400 yards away. Mind you not saying this won’t change when I get a decent antenna up there.

 

Regards to all,

 

Colin de G8LBS.

 

 

 

 

 

Sent from Mail for Windows 10

 

From: Richard GD8EXI
Sent: 16 September 2020 22:27
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ground noise on 23cm?

 

I doubt it can be ground noise if it is S5. On 23cms you are unlikely to see more than 3dB change in noise, between beaming into a hillside and beaming down hill. The antenna noise temp going from say 100 to 200K, so even with a RX noise temperature of 50K, only expect a 2.2dB difference.
 
As Andy stated more likely the presence of one or more very strong signals, mixing in your RX at the /P location.
 
Another common culprit is a DTV transmitter centred on about 650MHz. The intermodulation products look like white noise in a 3kHz bandwidth on 1296MHz. Also do not assume your beam will tell you where the source is, as the polar diagram will look very different on 650MHz.
 
Best test is a good 1296MHz bandpass filter in front of any amplification. The trouble is the path loss of about 1dB. I use a 650MHz notch filter in front of my masthead preamp and an interdigital one after it. The noise floor drops by 10dB on some beam headings, on adding this combination, even after correcting for insertion loss.

73s
Richard
GD8EXI




On 16/09/2020, 20:20, "Andy G4JNT" <andy.g4jnt@...> wrote:

The product is 2160MHz  [which is on the edge of a 3G channel]  -   2 x 1152 [LO]  =  144MHz

Andy
www.g4jnt.com <http://www.g4jnt.com>



On Wed, 16 Sep 2020 at 20:18, Andy Talbot <andy.g4jnt@...> wrote:

If you're using aa 144MHz IF, there's a chance you're seeing IM products between your mixer LO and one of the 3G base station channels.   I'd have to look up the channel that cases the problems, but it was bad here until I added an additional filter in the Rx chain

Andy
www.g4jnt.com <http://www.g4jnt.com>



On Wed, 16 Sep 2020 at 20:13, G0FVI via groups.io <http://groups.io>  <Andrew.gilfillan@...> wrote:

I'm still learning being relatively new to uwaves so apologies if this question seems a bit 'dumb'. I'm noticing fairly high noise levels on 23cm UKAC from my /P location (S5) but it's not constant in all directions and tails off to zero in several directions particularly due east to the continent (ground slope away to east and there are no obvious nearby man made sources of noise although there are HT pylons about 100 yards away). I'm not getting this at home with the same setup mounted on mast at about 35 feet (/P mast is only 20 feet), so I'm guessing it is perhaps ground noise? 

Andy G0FVI

 

 

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