Date   

Re: 24GHz, 47GHz, and 76-248GHz Contests next weekend, 21st July

David Robinson
 

i am still waiting for my beer for that reception all those years ago

Dave!

On Jul 14, 2013, at 4:38 AM, "G4BAO" <john@g4bao.com> wrote:



please. Dave G4FRE still holds the DX reception record for GB3CAM/24 at 150km, so how about trying to knock Dave off his perch next weekend? A beer on me at the next round table for the group/individual that does!

73
John


Transverter controller

Andy G4JNT
 

This month's QEX has a design for a transverter controller.  Apart from all the switching / control functions, the author has also included a 28-30MHz SSB generator, and Tx/Rx converter for 144MHz.   That way, all the faff and complication of Tx/Rx of IF switching, high power attenuators and things are not needed.   For Rx a conventional receiver or SDR is used, the two being linked in frequency tuning by a CAT interface.
 
It struck me how nice and elegant this solution is - SDRs are everywhere for receive, and make operating so much nicer, but you don't see them on Tx so much.  
 
He uses a conventional filter type SSB generator operating at 9MHz then upconverted to 28MHz using a DDS LO.  Which seems a bit retro (and the 9MHz CIO is unlocked).
 
For SSB generation, an I/Q generator might be a better solution, using a DSPic with its internal A/D used as a Hilbert generator for teh 0/90 degree audio paths.  That might even be the final spur to learning about the DSPic here !
 
Andy
G4JNT
 


Re: 24GHz, 47GHz, and 76-248GHz Contests next weekend, 21st July

g4bao
 

I'm not really "in the loop" with the mmwavers as I've only recently got back on the band, but I plan to be QRV on 24GHz (and 10GHz) from home during the contest and co-ordinating via KST.

It would be good if the portable stations could let me know their approximate whereabouts on the Sunday so I can be QRV at the right time. If the info was on this reflector, not direct that would be even better for promoting the higher bands.

Hopefully I can also encourage Roger G4BEL to come on 24Ghz from his home QTH up the road from me JO02BI

Equipment here for 24GHz at JO02cg33

TX 1 Watt at feed
RX 5dB NF at feed
Antenna 60cm dish at 8magl with elevation control

Contact: Skype johng4bao, Twitter @g4bao, landline on the day 01223862480

Please also listen for my beacon GB3CAM IO92WI53 GPS locked on 24048.870 running JT4G and CW. reports via beaconspot.eu please. Dave G4FRE still holds the DX reception record for GB3CAM/24 at 150km, so how about trying to knock Dave off his perch next weekend? A beer on me at the next round table for the group/individual that does!

73
John


I won't be putting together a formal activity list for this event, as I
expect those with the capability to take part are already in touch with
each other to coordinate sites etc, so this is just a reminder that the
UK Microwave group mm wave contest is next Sunday 21st July, from 0900 -
1700z (1000 - 1800 BST).

73

John G3XDY


Re: GB3MCB on 23 cms [3 Attachments]

John E. Beech
 

Tnx fer the info Ralph,
I can't normally hear the beacons from home ( Coventry) but found them useful when in
Scillies. On my way home now; stopped off in Devon to visit my sister.

de John G8SEQ

-------Original Message-------
From: Ralph Bird <Ralph.Bird@btinternet.com>
To: ukmicrowaves@yahoogroups.com
Subject: Re: [ukmicrowaves] GB3MCB on 23 cms [3 Attachments]
Sent: Jul 13 '13 16:20

[Attachment(s) from Ralph Bird included below]


Hello John,

As far as I know, they do not use common frequency reference.
Each beacon is a completely seperate unit.

Couple of photos taken at the site in 2010

73
Ralph G4ALY


----- Original Message -----
FROM: [LINK: mailto:john@g8seq.com] john@g8seq.com
TO: [LINK: mailto:ukmicrowaves@yahoogroups.com]
ukmicrowaves@yahoogroups.com
SENT: Saturday, July 13, 2013 9:14 AM
SUBJECT: Re: [ukmicrowaves] GB3MCB on 23 cms


I haven't made an accurate measurement but the 6m beacon seemed slightly
off frequency last night. Do they all use the
same frequency reference? G8SEQ/P lsles of Scilly.

> -------Original Message-------
> From: Lawrence <[LINK: mailto:lawrence@werewoolf.org]
lawrence@werewoolf.org>
> To: [LINK: mailto:ukmicrowaves@yahoogroups.com]
ukmicrowaves@yahoogroups.com
> Subject: [ukmicrowaves] GB3MCB on 23 cms
> Sent: Jul 12 '13 14:40
>
> Has anyone checked the frequency of GB3MCB on 23 cms recently?
>
> For some time I have been looking for it without any luck. I assumed it
> was
> because it beams NE, which is sideways on to me, and that I use a
rather
> low
> gain log periodic antenna. This morning I found it but it was not where
I
> thought it would be. The web sites that list it give the frequency as
> 1296.860
> MHz but my radio indicated 1296.845 MHz which was much lower than I had
> anticipated.
>
> My radio is the IC-910X and earlier this year I had replaced the
crystal
> oscillator with the optional high stability CR-293 (photos of this and
of
> the
> antenna are on my QRZ entry). I have not calibrated it yet but hope to
be
> able
> to do soon. I have acquired a Jupiter T GPS receiver and could use the
> ratio
> function on my counter to compare the 30.2 MHz with 10 kHz until I
build a
> PLL
> circuit to give me 10 MHz.
>
> When I have compared my indicated frequency on 23 cms with others it is
> usually
> similar and within 1 kHz so I assume I am not too far out. The CR-293
has
> greatly improved the stability and so got rid of the drift which had
been
> annoying. That was the most important improvement that I had been
looking
> for.
>
> 73, Lawrence GJ3RAX
>
>
>


No virus found in this message.
Checked by AVG - [LINK: http://www.avg.com] www.avg.com
Version: 2013.0.3349 / Virus Database: 3204/6487 - Release Date: 07/12/13


Re: 24GHz, 47GHz, and 76-248GHz Contests next weekend, 21st July

Ole OZ2OE
 

Hi John
 
Do you know of a location in the southwest that will be activated during the test the 21'th - or could point me to someone who knows?
 
I will be on holidays in the UK at the time. On the 21'st we shall be leaving a B&B in Oxford in the morning and ending up in Plymouth late afternoon, visiting places of interest - my wife wants to see Stonehenge - so I can have a wish too. If it's more or less on our route it would be fun to check in on one the test sites. Even just for the view from a hilltop.
 
Unfortunately I cannot bring any of my 24, 47 og 76 GHz equipment with me. Weight limits on Ryanair are quite restrictive.
 
73 Ole OZ2OE
 

From: G3XDY
Sent: Sunday, July 14, 2013 12:10 AM
Subject: [ukmicrowaves] 24GHz, 47GHz, and 76-248GHz Contests next weekend, 21st July

 

I won't be putting together a formal activity list for this event, as I
expect those with the capability to take part are already in touch with
each other to coordinate sites etc, so this is just a reminder that the
UK Microwave group mm wave contest is next Sunday 21st July, from 0900 -
1700z (1000 - 1800 BST).

73

John G3XDY


Re: GB3MCB on 23 cms [1 Attachment]

Ralph
 

gm Tim
 
No master reference down here on the St. Austell bkn
The temperature in the concrete hut there will probably be
high . It is 26.5C in the shade here 30k from there
at a similar altitude.
 
73 Ralph G4ALY
 
 

----- Original Message -----
Sent: Sunday, July 14, 2013 9:29 AM
Subject: [ukmicrowaves] Re: GB3MCB on 23 cms [1 Attachment]

 

Just as another data point I can hear GB3MCB up here in IO83LR at sea level.  


It is peaking to s3 this morning and quite audible.

I make it's freq 1296.846325MHz - GPS locked IC-9100 and using Spectran to measure audio tone.
See attached file.

Using a 16 ele at about 30 feet AGL /ASL

As for 6 mtrs - MCB also seems a little off freq there as well, not sure why as my IC-7800 is also GPS locked, maybe they use a master reference ?

73 Tim G4WIM / KT6UK

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3349 / Virus Database: 3204/6489 - Release Date: 07/13/13


Re: GB3MCB on 23 cms

G4WIM KT6UK
 

Just as another data point I can hear GB3MCB up here in IO83LR at sea level.  

It is peaking to s3 this morning and quite audible.

I make it's freq 1296.846325MHz - GPS locked IC-9100 and using Spectran to measure audio tone.
See attached file.

Using a 16 ele at about 30 feet AGL /ASL

As for 6 mtrs - MCB also seems a little off freq there as well, not sure why as my IC-7800 is also GPS locked, maybe they use a master reference ?

73 Tim G4WIM / KT6UK


Re: Microwave Field Day

John GM8OTI
 

Count me in! I now have (I think) about 1W on 10GHz, and hope to be active either from one location, or possibly roving, for the contest. I can also provide a few watts on 23cm but don't know whether or not I will take my 2m portable dish - if fixed I will, else it will be just a 15-ele Yagi. Location should be in south west Scotland. Details on due course once I have decided ...

73
John GM8OTI

--- In ukmicrowaves@yahoogroups.com, G3XDY <g3xdy@...> wrote:

Another reminder, this time for Microwave Field Day which takes place on
Sunday August 4th from 0900-1700z (1000 - 1800 BST), on the 1.3GHz and
10GHz bands, with Open and Restricted sections for portables, and a new
section for fixed stations this year. This is a great opportunity to try
some portable operation on the microwaves and introduce newcomers to
what is afoot on the two most active microwave bands, its not too late
to plan a foray.

I will circulate an activity list about a week before the event.

73

John G3XDY


Re: Finningley

g8ugl <jim@...>
 

All credit to you Dave. Well said.
========================================
Message Received: Jul 13 2013, 02:25 AM
From: "Dave"
To: ukmicrowaves@yahoogroups.com
Cc:
Subject: Re: [ukmicrowaves] Finningley

Dear All,

I now realise that I was on the wrong site to ammend my registration for Finningley this year. After using the UKuG site to access the Finningley website for this
year, I was able to re-enter my registration.

At this point I should apologise for some of the postings that I have made recently. My explanation, but not excuse, is that I have been under some pressure
both personally and through work and I have, I am sorry to have to admit, allowed my frustration and anger to be relayed on this and other forums.

After discussing this with other radio amateurs and, I hope still, friends, I have decided to take the digest version. This should allow me to think before I post in
future.

Dave (G0DJA)


24GHz, 47GHz, and 76-248GHz Contests next weekend, 21st July

John Quarmby
 

I won't be putting together a formal activity list for this event, as I expect those with the capability to take part are already in touch with each other to coordinate sites etc, so this is just a reminder that the UK Microwave group mm wave contest is next Sunday 21st July, from 0900 - 1700z (1000 - 1800 BST).

73

John G3XDY


Microwave Field Day

John Quarmby
 

Another reminder, this time for Microwave Field Day which takes place on Sunday August 4th from 0900-1700z (1000 - 1800 BST), on the 1.3GHz and 10GHz bands, with Open and Restricted sections for portables, and a new section for fixed stations this year. This is a great opportunity to try some portable operation on the microwaves and introduce newcomers to what is afoot on the two most active microwave bands, its not too late to plan a foray.

I will circulate an activity list about a week before the event.

73

John G3XDY


Re: LTC6946 Synth Module

Andy G4JNT
 

Oh yes, RF decoupling around the RF output.  It needs to go in the C15,C16,C23,C25    220p (or a suitable value) category
I'll add to the updates
 
Andy
 


On 13 July 2013 17:36, Ed <ed.murphy31@...> wrote:
 

Hi Andy,

The circuit diagram and the parts list do not list a C11. Your PCB has a C11 fitted ? I have fitted a value that has an SRF close to my intended output frequency. Could you advise .

Regards

Ed GM3SBC



Re: LTC6946 Synth Module

Ed <ed.murphy31@...>
 

Hi Andy,

The circuit diagram and the parts list do not list a C11. Your PCB has a C11 fitted ? I have fitted a value that has an SRF close to my intended output frequency. Could you advise .

Regards

Ed GM3SBC


Re: How to tune a 20ghz filter to 24ghz ??

John Lambo
 

Hello Doug and others
Yes it is a micorstrip filter en very small ;-))
I will try what i can do..

73 John PA7JB



Op 13-7-2013 13:34, DougF schreef:

Hello John and other readers.

Regarding the possibility of re-tuning a 20 GHz stripline filter
(presumably "microstrip"!) that far up in frequency, my experience is
that it is probably a "tall ask". It might just be possible, but
removing parts of the filter elements will cause significant 'damage' to
the originally designed performance parameters, meaning that the final
result may have worse insertion loss, bandwidth and input/output
impedance. If you're willing to risk that outcome, by all means give
modification a go....but you'll probably have only ever one chance at
being successful! And, my experience is that it's far easier to bring
'microstrip' filters down in frequency than it is to raise their
operating frequency.....

With your question about the DRO, I don't have any experience with
replacing DRO pucks. Hopefully someone else will comment. But are you
talking about free-running DROs which have doubtful usability except for
wideband FM operation, or are you talking about DROs that are locked to
a stable reference oscillator?

Very best wishes,

--Doug Friend, VK4OE.

On 13/07/2013 8:55 PM, John Lambo wrote:
Hello microwavers
I got form e-bay a 20 ghz LNB
What i like to know is:
I wonder does any one try to tune this strip line filter from 20 ghz to
24ghz ??
And also what will happend if i put a other dro in the oscillator and
try to get it wroking on 23ghz or beter to say 11,5 ghz.
Thank you for reply .

73 John PA7JB

------------------------------------

Yahoo! Groups Links




Re: GB3MCB on 23 cms

Ralph
 


Hello John,
 
As far as I know, they do not use common frequency reference.
Each beacon is a completely seperate unit.
 
Couple of photos taken at the site in 2010
 
73
Ralph G4ALY
 
 

----- Original Message -----
From: john@...
Sent: Saturday, July 13, 2013 9:14 AM
Subject: Re: [ukmicrowaves] GB3MCB on 23 cms

 


I haven't made an accurate measurement but the 6m beacon seemed slightly off frequency last night. Do they all use the
same frequency reference? G8SEQ/P lsles of Scilly.

> -------Original Message-------
> From: Lawrence <lawrence@...>
> To: ukmicrowaves@...
> Subject: [ukmicrowaves] GB3MCB on 23 cms
> Sent: Jul 12 '13 14:40
>
> Has anyone checked the frequency of GB3MCB on 23 cms recently?
>
> For some time I have been looking for it without any luck. I assumed it
> was
> because it beams NE, which is sideways on to me, and that I use a rather
> low
> gain log periodic antenna. This morning I found it but it was not where I
> thought it would be. The web sites that list it give the frequency as
> 1296.860
> MHz but my radio indicated 1296.845 MHz which was much lower than I had
> anticipated.
>
> My radio is the IC-910X and earlier this year I had replaced the crystal
> oscillator with the optional high stability CR-293 (photos of this and of
> the
> antenna are on my QRZ entry). I have not calibrated it yet but hope to be
> able
> to do soon. I have acquired a Jupiter T GPS receiver and could use the
> ratio
> function on my counter to compare the 30.2 MHz with 10 kHz until I build a
> PLL
> circuit to give me 10 MHz.
>
> When I have compared my indicated frequency on 23 cms with others it is
> usually
> similar and within 1 kHz so I assume I am not too far out. The CR-293 has
> greatly improved the stability and so got rid of the drift which had been
> annoying. That was the most important improvement that I had been looking
> for.
>
> 73, Lawrence GJ3RAX
>
>
>

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3349 / Virus Database: 3204/6487 - Release Date: 07/12/13


activity

Carlo Castelli <i4cvc@...>
 



hi! i'm active from jn71su all band from 2mt to 15mm i'm interested at rs fenomen!
ciao i4cvc/7


Re: How to tune a 20ghz filter to 24ghz ??

DougF VK4OE
 

Hello John and other readers.

Regarding the possibility of re-tuning a 20 GHz stripline filter (presumably "microstrip"!) that far up in frequency, my experience is that it is probably a "tall ask". It might just be possible, but removing parts of the filter elements will cause significant 'damage' to the originally designed performance parameters, meaning that the final result may have worse insertion loss, bandwidth and input/output impedance. If you're willing to risk that outcome, by all means give modification a go....but you'll probably have only ever one chance at being successful! And, my experience is that it's far easier to bring 'microstrip' filters down in frequency than it is to raise their operating frequency.....

With your question about the DRO, I don't have any experience with replacing DRO pucks. Hopefully someone else will comment. But are you talking about free-running DROs which have doubtful usability except for wideband FM operation, or are you talking about DROs that are locked to a stable reference oscillator?

Very best wishes,

--Doug Friend, VK4OE.

On 13/07/2013 8:55 PM, John Lambo wrote:
Hello microwavers
I got form e-bay a 20 ghz LNB
What i like to know is:
I wonder does any one try to tune this strip line filter from 20 ghz to
24ghz ??
And also what will happend if i put a other dro in the oscillator and
try to get it wroking on 23ghz or beter to say 11,5 ghz.
Thank you for reply .

73 John PA7JB


How to tune a 20ghz filter to 24ghz ??

John Lambo
 

Hello microwavers
I got form e-bay a 20 ghz LNB
What i like to know is:
I wonder does any one try to tune this strip line filter from 20 ghz to 24ghz ??
And also what will happend if i put a other dro in the oscillator and try to get it wroking on 23ghz or beter to say 11,5 ghz.
Thank you for reply .

73 John PA7JB


JN27.. Activity

f1npx <dominique.dobler@...>
 

Hello all; sunday morning (14th july) I will be QRV 3cm (JN27..) for French microwave activity ("Mont Blanc" Scatter). Like I know that some OM in UK are interresting to this locator , at twelve o'clock (local time) I'm calling 144.175Mhz.
73's Dom; F1NPX (Sorry for my English, which is rusty a lot)


Re: SK6OSO Onsala 25m dish 23cm EME this weekend - min elevation limit

g4cch_1
 

1029z QRV now on 1296.050 + doppler 2.66KHz

--- In ukmicrowaves@yahoogroups.com, "Howard" <g4cch_1@...> wrote:

Sorry for the late notice, but it was only posted by the team at SK6OSO about 30 minutes ago.

They need a minimum elevation of 13 deg before they can be QRV.

This means that they will be QRV from approx

1040z today 13/07
1200z tomorrow 14/07

Unfortunately the Moon will be up at approx 7 or 8 deg by the time they acquire Moon. So this will limit the opportunity for stations without no elevation.

Best 73 & GL
Howard