Date   

Re: [UKBeacons] GB3CSB -- 10G ON Air -- Update 05

David GM6BIG
 

Hi All,

New LO chain built and fitted to the 10GHz part of GB3CSB to replace the original failed unit.

Thanks to Mark GM4ISM and Alan GM0USI for checking all was well off air when the equipment was restored to service this evening.

For the moment, 10G power remains the same as before.

If anyone would like to donate a suitable 10G PA (24/7 running) of a few watts or more please get in touch by email, gm6big@gmail.com
The existing PA is just over 1W, and solid as a rock, but a little more poke to the antenna would be better.....



With great timing, the annual electric bill is due soon to Walter GM8IIH, the very helpful site owner.
If anyone would like to donate, please send to my Paypal account at...

aware@freeuk.com

(Do not email me using that address though)
Please include a message with your call so I know who your are.

Thanks again to those who have already sent me some help...!

Cheers, David

On 11/08/2020 10:41, David GM6BIG via groups.io wrote:
Hi All,
The temporary exciter for CSB has been removed and the original repaired (and upgraded) driver now returned to service.
So now back to its usual self.
GPS locked, JT4 etc.
With one exception,  the 10GHz is OFF.
At some point since installing the temporary exciter the 10GHz part has failed.
Nothing obviously wrong with the 10GHz assembly, so until its on the bench and I find what is wrong with it, I cant predict how long it will be off air for.
Perhaps an opportunity to replace the 10G PA with a more powerful one !
Cheers, DAvid
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GB3CSB on 10GHz

Mark GM4ISM
 

Thanks to Dave GM6BIG, the rebuilt GB3CSB 10GHz beacon is back on and working well.

Reports welcome!


Mark GM4ISM


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Re: Farnham and Mow Cop SDRs

Colin G4EML
 

Try looking for SEE later in the day when the temperature has reduced. It has an intermittent fault at the moment where the power drops when the ambient temp is above about 20 degrees. 

Colin G4EML. 


On 8 Sep 2020, at 14:41, Adrian G4UVZ via groups.io <adrianwhatmore248@...> wrote:

Sound now working on Mowcop...but no sign of SEE or anything else on Farnham?

Any ideas if it is working?


Re: Farnham and Mow Cop SDRs

G1DFL
 

GB3SEE 10GHz at Reigate is there, just weak into Farnham SDR this afternoon. It's been orange (poorly?) on Beaconspot for a while, does drop off the SDR during hot weather. 

Looking forward to GB3GCT the new 10GHz beacon when its operational from Greenham Common. That will be a better direction for me.

Regards..Pete
G1DFL


On Tue, 8 Sep 2020 at 14:41, Adrian G4UVZ via groups.io
<adrianwhatmore248@...> wrote:
Sound now working on Mowcop...but no sign of SEE or anything else on Farnham?

Any ideas if it is working?


Re: Farnham and Mow Cop SDRs

Adrian G4UVZ
 

Sound now working on Mowcop...but no sign of SEE or anything else on Farnham?

Any ideas if it is working?


Re: FS: coax to waveguide transitions

Alex May M1BSX
 

Hi Wilko,

Thanks a lot for this link - could be useful! :-)

73s Alex


On Tue, 8 Sep 2020, 08:31 Wilko, <wkb@...> wrote:
hi,

I seem to remember people were/are looking for waveguide to coax transitions.  I just stumbled on this
one:  

https://www.zendamateur-marktplaats.nl/antennestoebehoren/golfpijp/wr90-sma-adapter-incl-meetrapport-wr112-n-8056.html

I am not associated with the seller, just thought it might be useful to someone.

73 Wilko
PA1WBU


FS: coax to waveguide transitions

Wilko
 

hi,

I seem to remember people were/are looking for waveguide to coax transitions.  I just stumbled on this
one:  

https://www.zendamateur-marktplaats.nl/antennestoebehoren/golfpijp/wr90-sma-adapter-incl-meetrapport-wr112-n-8056.html

I am not associated with the seller, just thought it might be useful to someone.

73 Wilko
PA1WBU


Re: Farnham and Mow Cop SDRs

Neil Smith G4DBN
 
Edited

I can hear myself fine on Mow Cop this evening, propagation is pretty much back to normal, with OSW arriving here at -15dB in JT4G.  No sign of GB3KBQ, but CAM is about S3 and I'm hearing PKT pretty well, despite it being enfeebled at present. 

Mow Cop receive level fro my signal is usually 6dB over noise across the Peak District/Staffordshire Moorlands from down here near sea level.

I was about the same strength on Mow Cop as OSW was, at least until a plane at 2500 ft on the approach to Manchester produced a nice fat AS reflection.

Neil G4DBN

On 07/09/2020 18:10, Mark GØNMY wrote:

I have been logged onto mowcop sdr the last three nights Fri Sat Sunday and it hasnt lost OSW beacon, LEX image came up after midnight on Sat and Sun. but is down in the noise now.

OSW is S7 on the SDR meter.

One tip, you may already know this but, on the Waterfall settings

Under view select weak sigs it helps show up weaker signals.

If you already knew this then carry on, as you were hee hee

 p.

View/Reply Online (#58271) | Reply To Group | Reply To Sender | Mute This Topic | New Topic

Your Subscription | Contact Group Owner | Unsubscribe [neil@...]

_._,_._,_
-- 
Neil
http://g4dbn.uk


Re: Farnham and Mow Cop SDRs

Mark GØNMY
 

Yes the two artifacts are birdies of some kind I dont know if they are internal or externally generated.

Shame about html5 not working, I use FireFox browser and have no issues, once I select html5 but I think it is selected by default as Java suxs

 

Hope that helps a little.

73 Mark G0NMY


Re: Farnham and Mow Cop SDRs

Adrian G4UVZ
 

On Mon, Sep 7, 2020 at 10:10 AM, Mark GØNMY wrote:

 

Under view select weak sigs it helps show up weaker signals.

If you already knew this then carry on, as you were hee hee

Thanks very much for the info ..I wasn't aware of the weak sig option..I can now see the Oswestry beacon..I assume that the 2 other signal pretty much symetrical on the centre line are funies. Unfortunately I can't hear any idents as I gave up a long time ago trying to get Java to work on my PC and the HTML sound doesn't seem to work either!..unless I am not clicking something I should!

 

 

 


From: Adrian G4UVZ <adrianwhatmore248@...>

 
 
 
Reply to Group Discard Private


Re: Farnham and Mow Cop SDRs

Mark GØNMY
 

I have been logged onto mowcop sdr the last three nights Fri Sat Sunday and it hasnt lost OSW beacon, LEX image came up after midnight on Sat and Sun. but is down in the noise now.

OSW is S7 on the SDR meter.

One tip, you may already know this but, on the Waterfall settings

Under view select weak sigs it helps show up weaker signals.

If you already knew this then carry on, as you were hee hee

 

 


Re: GB3PKT

g4bao
 

The beacon keeper's still working on the issue so expect this and other outages. 

73
John


Re: full duplex. was: G0MRF downconverter

G8TZJ
 

To solve changing the AF gain control between Tx and Rx, I use an external speaker with a modification. Inserted in series with the speaker live wire is a low value variable resistor (I used 200 ohm) with a relay contact, normally closed,  across it. The relay's coil is powered from the ACC +12 V and the PTT line. Don't forget a protection diode across the coil. So during Rx the external speaker is at full volume, and when in Tx the volume drops (the replay contacts are open) to whatever level you set with the 200 ohm control. Just set the volume so you can hear something during Tx but not enough to have an echo.

73 Andrew G8TZJ


Re: Earth stakes

Robin Szemeti - G1YFG
 

Way, way off topic now ;) 

I still maintain that any unbalanced HF system needs to take into account that the "earth system" is half of the aerial.  Radial wires will always outperform spikes in the ground, by an order of magnitude or more.   Feel free to call in on 1942khz any morning at 10am,   there are a few of us with a decent aerial to prove the point. GM3YXM is usually pretty loud from Dumfries,  and PXQ/DKV from the Derby area can be detected merely by holding up a light bulb and waiting for them to come on.
 


On Mon, 7 Sep 2020 at 14:28, Ian White <gm3sek@...> wrote:

Results will depend totally on where you are, and your type of ground.

An old 'In Practice' article http://www.ifwtech.co.uk/g3sek/in-prac/0710.pdf covers many of the points.

I thoroughly agree with both Alwyn and Robin. Here we're on rock, a mixture of hard stones and broken shale, any one of which will stop an earth rod unless I have first drilled a pilot hole (and it's unlikely that rod can be sunk any father than the 1.0m length of the drill bit), the reward for all that effort being an earth resistance of several hundred ohms. That is why our primary mains earth is now a 15m long copper ribbon laid in a trench at the foot of the house walls where it will pick up all the rainwater runoff (that feature is operational right now).

Contrast that with the old QTH in the Thames valley, where the water table was only 2-3ft below ground and a double-length earth rod would sink through the surface clay like butter.

Meanwhile, up on the chalk Downs, a friend resorted to an old copper hot-water cistern - drilled with holes, buried upright, filled with gravel, and then constantly watered by a rainwater diverter from the roof.

73 from Ian GM3SEK



On 07/09/2020 08:40, alwyn.seeds1 wrote:

Dear Robin,

Yes, indeed. 

I’m sure there are better methods, but in the Cotswolds, I resorted to a 1m long drill drill to put a hole through any stones in the compacted farmed layer. It was then possible to drive rods through the holes, presumably splitting the stones on the way. Once through this layer, it was possible to continue driving the rest of the 1.5m rod in. After a season the soil movement locks the rod in immoveably. Ground resistance per rod was around 80 ohms, so a lot of rods were needed to provide an acceptable lightning ground.

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.
_____________________________________________________


--
Robin Szemeti - G1YFG


Re: Earth stakes

ian hope (2E0IJH)
 

Many Jobs around Wrotham, Borough Green, Sevenoaks, where there is a heavy layer of Sand we had to put bonded cages in trenches to get sufficent earthing for Substations, The very worse one that took a trench 15m long with 6 cages was Charing, which also has heavy sand. All of these had to be back filled with a GEM type material to improve the Earthing.
 
Ian
M5IJH

 
 
Sent: Monday, September 07, 2020 at 2:28 PM
From: "Ian White" <gm3sek@...>
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Earth stakes

Results will depend totally on where you are, and your type of ground.

An old 'In Practice' article http://www.ifwtech.co.uk/g3sek/in-prac/0710.pdf covers many of the points.

I thoroughly agree with both Alwyn and Robin. Here we're on rock, a mixture of hard stones and broken shale, any one of which will stop an earth rod unless I have first drilled a pilot hole (and it's unlikely that rod can be sunk any father than the 1.0m length of the drill bit), the reward for all that effort being an earth resistance of several hundred ohms. That is why our primary mains earth is now a 15m long copper ribbon laid in a trench at the foot of the house walls where it will pick up all the rainwater runoff (that feature is operational right now).

Contrast that with the old QTH in the Thames valley, where the water table was only 2-3ft below ground and a double-length earth rod would sink through the surface clay like butter.

Meanwhile, up on the chalk Downs, a friend resorted to an old copper hot-water cistern - drilled with holes, buried upright, filled with gravel, and then constantly watered by a rainwater diverter from the roof.

73 from Ian GM3SEK

 

 

On 07/09/2020 08:40, alwyn.seeds1 wrote:

Dear Robin,
 
Yes, indeed. 
 
I’m sure there are better methods, but in the Cotswolds, I resorted to a 1m long drill drill to put a hole through any stones in the compacted farmed layer. It was then possible to drive rods through the holes, presumably splitting the stones on the way. Once through this layer, it was possible to continue driving the rest of the 1.5m rod in. After a season the soil movement locks the rod in immoveably. Ground resistance per rod was around 80 ohms, so a lot of rods were needed to provide an acceptable lightning ground.
 
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: Earth stakes

Ian White
 

Results will depend totally on where you are, and your type of ground.

An old 'In Practice' article http://www.ifwtech.co.uk/g3sek/in-prac/0710.pdf covers many of the points.

I thoroughly agree with both Alwyn and Robin. Here we're on rock, a mixture of hard stones and broken shale, any one of which will stop an earth rod unless I have first drilled a pilot hole (and it's unlikely that rod can be sunk any father than the 1.0m length of the drill bit), the reward for all that effort being an earth resistance of several hundred ohms. That is why our primary mains earth is now a 15m long copper ribbon laid in a trench at the foot of the house walls where it will pick up all the rainwater runoff (that feature is operational right now).

Contrast that with the old QTH in the Thames valley, where the water table was only 2-3ft below ground and a double-length earth rod would sink through the surface clay like butter.

Meanwhile, up on the chalk Downs, a friend resorted to an old copper hot-water cistern - drilled with holes, buried upright, filled with gravel, and then constantly watered by a rainwater diverter from the roof.

73 from Ian GM3SEK



On 07/09/2020 08:40, alwyn.seeds1 wrote:

Dear Robin,

Yes, indeed. 

I’m sure there are better methods, but in the Cotswolds, I resorted to a 1m long drill drill to put a hole through any stones in the compacted farmed layer. It was then possible to drive rods through the holes, presumably splitting the stones on the way. Once through this layer, it was possible to continue driving the rest of the 1.5m rod in. After a season the soil movement locks the rod in immoveably. Ground resistance per rod was around 80 ohms, so a lot of rods were needed to provide an acceptable lightning ground.

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: Contest scores

Robin Szemeti - G1YFG
 


....I just got a UBN for one of them saying "Not In Log"! I nearly fell off my chair! :)
So whilst you think you can have a successful QSO, your success is as much about the other stations accuracy!
 
I had this on one in 23cm,  we struggled to work the first contact, I thought we had got most of it through ... later on he appeared again much louder and we confirmed the log entry, but he wanted to use the current time ... well, fair enough then, I put him in the lof as a new entry, new serial and new time ... and lost all the points as "not in log" ...

--
Robin Szemeti - G1YFG


Re: Contest scores

Robin Szemeti - G1YFG
 

I always lose points, I try to do better. I suspect there might be dome dyslexia creeping in.

Recent evidence of my idiocy includes recording one station as a G9xxx callsign,  a mistyped 4x9 signal report etc.   I know in the last  2m UKAC I forgot to tell the first contact I was /P ... and when I ran out of log sheets I got a bit confused on the numbers and I fear I gave out one incorrectly, (which would not be so bad, but I think it was XDY, I may never live it down!!)

The last UKAC 2m was a belter, I went portable instead of my usual hole in the ground and worked 147 stations on a 6ele beam, including EI, GJ and other .. best DX was 712km, deep into Germany ...



On Mon, 7 Sep 2020 at 12:52, Neil Smith G4DBN <neil@...> wrote:

The philosophy appears to be that the log entry represents Truth, and that what was actually sent is not relevant.  Recordings are not accepted as evidence, and listening back to recordings to make log corrections after the contest is agin the roolz anyway, so it says here...

There is a little bit of flexibility on the part of the adjudicators. I was hit by a silly config bug in some of my logs where the report was defaulted to 59 even though I sent something else, and the contest adjudicator gave me the hard stare and didn't dock points from the others, but really should have docked me some points for being persistently wrong.

I think the idea is that it all evens out on average.  I've had a few cases where my recording definitely showed a typo or sending error at the other end, but my approach is now to do extra repeats and read back the inbound report for confirmation to the station who made the logging error. 

Could be someone doing manual logging or having a problem with a computer log or doing multiple bands and reading off the serial number for the wrong band.  Or just someone daft and scatty like me. I lost some 250+ point contacts through rubbish logging typos.

Neil G4DBN



On 07/09/2020 12:33, militaryoperator via groups.io wrote:

SN Rx
Correct SN Rx
Reason
Penalties
Notes
2 6








Very odd. a solid 59 contact, heard s/n 2 but senders log apparently says it was 6

I have noticed this before, clearly hearing one thing then told I got it wrong according to other stations log. 

Maybe time to record all qso's, I think I'm being diddled out of points here!! hi. 

Ben
_._,_._


--
Robin Szemeti - G1YFG


Re: Contest scores

Pete - GM4BYF
 

I did an analysis some months ago. At least 50% of my UBNs were due to logging mistakes by the other party.

There's no appeal. A year or two ago one portable station reversed the received and transmitted rst & serials. No penalty to them but  UBNs for a plethora of stations.

73
Pete GM4BYF
On 07/09/20 12:33, militaryoperator via groups.io wrote:


SN Rx
Correct SN Rx
Reason
Penalties
Notes
2 6








Very odd. a solid 59 contact, heard s/n 2 but senders log apparently says it was 6

I have noticed this before, clearly hearing one thing then told I got it wrong according to other stations log. 

Maybe time to record all qso's, I think I'm being diddled out of points here!! hi. 

Ben

--
vry 73
Pete GM4BYF


Re: 28V PSU?

i2NDT
 

sorry no idea!
the label says: 120 - 250 VAC 50/60 Hz.

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