Date   

Re: Wimo 13cms aerial VSWR

Conrad, PA5Y
 

Alwyn the S331 is indeed useful and unlike it's cheaper predecessor the S251,  has an acceptable frequency accuracy the S251 was 200ppm I seem to recall which is not great on 13cms. However where can you get an S331 for a few hundred pounds? 

I would sell my IC-7300 to get an S331!

73

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of alwyn.seeds1 via Groups.Io <a.seeds@...>
Sent: 15 November 2019 22:23
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Wimo 13cms aerial VSWR
 
Dear All,

Yes, I have always liked the HP8753, but they are not cheap.

Although it is only a scalar analyser, the Anritsu S331 is pretty useful for aerial adjustment.

Also, it’s intended for use by riggers, so is compact lightweight and battery powered, so handy in the field.

A few hundred pounds on e-bay is the typical price.

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: Mystery coax part

Wilko
 

Ah! Thank you! This one really had me going "hm hm". Strangely enough it does not have an indication scale for its settings, nor does it have a facility to 'lock' the aluminium slide on the silvered coax tube.

Will see if I can figure out what range it has.

That said, I don't think I am ever going to use it, but prove me wrong HI

Many thanks to all that replied

73 Wilko


Re: Mystery coax part

Lou Blasco
 


On Mon, Nov 18, 2019 at 9:16 AM KENT BRITAIN <WA5VJB@...> wrote:
A slide tuner!

Great at giving you a 1 to 1 SWR at a given  point/frequency.

Microwave version of the classing HF antenna tuner.

Kent


On Sunday, November 17, 2019, 3:22:33 PM CST, Wilko <wkb@...> wrote:


Last Friday I spent a couple of € at a ham rally to acquire a mystery coax part. I hope 
the gurus on this list can help identify it.



Thanks in advance!

73 Wilko
PA1WBU


Re: Mystery coax part

KENT BRITAIN
 

A slide tuner!

Great at giving you a 1 to 1 SWR at a given  point/frequency.

Microwave version of the classing HF antenna tuner.

Kent


On Sunday, November 17, 2019, 3:22:33 PM CST, Wilko <wkb@...> wrote:


Last Friday I spent a couple of € at a ham rally to acquire a mystery coax part. I hope 
the gurus on this list can help identify it.



Thanks in advance!

73 Wilko
PA1WBU


Mystery coax part

Wilko
 

Last Friday I spent a couple of € at a ham rally to acquire a mystery coax part. I hope 
the gurus on this list can help identify it.



Thanks in advance!

73 Wilko
PA1WBU


Re: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

Neil Smith G4DBN
 

Hi Ben, there isn’t really a specific frequency these days. 10368.100 is popular, but stations seem to spread out from .090 to .220
In these times of SDRs and waterfalls, even during rain scatter events, a calling frequency isn’t really useful any more. Stations tend to pick a working frequency and stick to it.
I know who will be on .090 and .110 and .150 and .200, which helps when I am trying to dig out random contacts without KST.
Neil G4DBN

On 17 Nov 2019, at 09:45, militaryoperator via Groups.Io <Military1944@...> wrote:

What's the normal calling freq on 10GHz?

Ben.


_._


Re: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

militaryoperator
 

What's the normal calling freq on 10GHz?

Ben.



Re: Wimo 13cms yagi

alwyn.seeds1
 

Dear John,

The 18GHz N-types- non-slotted outers- depend critically on uniform contact between the front of the outer on the plug and the step in the socket.

If contact is incomplete, suck-outs result as with your load. 18GHz plugs usually have flats to enable them to be torqued correctly- 1.5 N.m

For general use at frequencies up to 11 GHz I prefer the slotted outers, as they engage against the sides of the socket outer and torque is less critical.

7/16 DIN connectors require contact as the 18GHz N types and this requires very considerable torque- 25 N.m.

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: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

Barry Lewis
 

Sorry to hear Ralph,
We'll miss you from Walbury Hill.
Look forward to catching you again next year!
GL 73
Barry G4SJH as M0HNA/P


Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November - Addendum

John Quarmby
 

I apologise for omitting one entrant from the list -  now added.

Thanks for all your inputs for the activity list for tomorrow's UKuG Low Band Contest which takes place from from 1000-1400 GMT, on the 1296, 2300, 2320 and 3400MHz bands.

Rules are here: http://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2019&contest=lb_contestNov


The weather forecast looks fairly benign for the time of year, with light winds predicted. Sadly no tropo though. Here's the activity list:

Callsign: G3UVR
Locator: IO83KH89
Bands:  1.3GHz 90W 1 x 23 ele Tonna
             2,32GHz 100W 1 x 25 ele Tonna
             3.4GHz Maybe next year
Times: Various throughout
Talkback: ON4KST Primary,. CQ's and S+P,. Zello SHF Chat if all else fails.

Callsign: G1PPA/P
Locator: IO93RI
Bands 1.3ghz 10w 44 ele wimo
Time: from start and see how it goes (weather permitting)
Talkback: Will be on kst

Callsign: G8DOH
Locator: IO92FA
Bands: 1.3GHz 125W 2 x 23 el
Times: Various throughout
Talkback: ON4KST, CQ on 1.3GHz

Callsign: M0HNA/P
Locator: IO91GI44
Bands: 1.3GHz 250W 67ele
2.3GHz 60W 0.9m dish
3.4GHz 15W 1.1m dish
Talkback: ON4KST, (23cm M0HNA-1, 9&13cm M0HNA-2) plus direct CQ on 23cm.
Times: Throughout the event

Callsign:  PA0P
Locator:  JO22EB
Band :     1.3GHz  150W 39 el Yagi
Times:     Throughout
Talkback: ON4KST , direct CQ

Callsign: G8GTZ/P
Locator: IO91JH
Bands: 2.3GHz 2W 25 ele yagi
            3.4GHz 15W .8m dish
Talkback: ON4KST, 144.390
Times: From 11am

Callsign: G8JVM
Locator: IO82SP
Bands: 1.3GHz 100W 70ele
       2.32GHz 100W 40ele
Times: Various throughout
Talkback: CQ on 1.3GHz, Zello SHF Chat

Callsign: G4CIO
Locator: IO81UQ (230 m ASL)
Bands:  1.3GHz 10 W
Times: Various
Talkback: ON4KST, maybe Zello

Call: G4ZTR
Locator: JO01KW
Bands: 1.3GHz 300w 2m dish
2.32GHz ~8w 2m dish
Times: throughout
Talkback: ON4KST

Callsign: G3YJR
Locator: IO93FJ
Bands: 1.3GHz 8W 33 el Wimo
              2.32GHz 25W 40 el Wimo
Times: Various throughout
Talkback: ON4KST

Callsign: GD8EXI
Locator: IO74PC
Bands:
1.3GHz 400 watts 60 ele Yagi
Times: Only first 2 hours unless conditions are very good.
Talkback: CQ and KST.

Callsign: GW4MBS
Locator: IO71XW
Bands: 1.3GHz 200 watts 35-el Yagi
Times: Most of time other than tea breaks
Talkback: KST2ME or email

Callsign: G3XDY
Locator: JO02OB
Bands: 1.3GHz 400W 4 x 23 el
              2.30/2.32GHz 200W 0.8m dish
             3.4GHz 20W 0.8m dish
Times: Various throughout
Talkback: ON4KST, CQ on 1.3GHz, Zello SHF Chat

73

John G3XDY
UKuG Contest Manager


Re: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

David Robinson
 

Callsign: G4FRE/P
Locator: IO81XW
Bands: 3.4GHz 7W panel antenna
Times: From start until it gets too cold for alfresco operation!
Talkback: ON4KST, Zello SHF Chat

will also have 3.4GHz DATV


Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

John Quarmby
 

Thanks for all your inputs for the activity list for tomorrow's UKuG Low Band Contest which takes place from from 1000-1400 GMT, on the 1296, 2300, 2320 and 3400MHz bands.

Rules are here: http://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2019&contest=lb_contestNov

The weather forecast looks fairly benign for the time of year, with light winds predicted. Sadly no tropo though. Here's the activity list:

Callsign: G3UVR
Locator: IO83KH89
Bands:  1.3GHz 90W 1 x 23 ele Tonna
             2,32GHz 100W 1 x 25 ele Tonna
             3.4GHz Maybe next year
Times: Various throughout
Talkback: ON4KST Primary,. CQ's and S+P,. Zello SHF Chat if all else fails.

Callsign: G1PPA/P
Locator: IO93RI
Bands 1.3ghz 10w 44 ele wimo
Time: from start and see how it goes (weather permitting)
Talkback: Will be on kst

Callsign: G8DOH
Locator: IO92FA
Bands: 1.3GHz 125W 2 x 23 el
Times: Various throughout
Talkback: ON4KST, CQ on 1.3GHz

Callsign: M0HNA/P
Locator: IO91GI44
Bands: 1.3GHz 250W 67ele
2.3GHz 60W 0.9m dish
3.4GHz 15W 1.1m dish
Talkback: ON4KST, (23cm M0HNA-1, 9&13cm M0HNA-2) plus direct CQ on 23cm.
Times: Throughout the event

Callsign:  PA0P
Locator:  JO22EB
Band :     1.3GHz  150W 39 el Yagi
Times:     Throughout
Talkback: ON4KST , direct CQ

Callsign: G8GTZ/P
Locator: IO91JH
Bands: 2.3GHz 2W 25 ele yagi
            3.4GHz 15W .8m dish
Talkback: ON4KST, 144.390
Times: From 11am

Callsign: G4CIO
Locator: IO81UQ (230 m ASL)
Bands:  1.3GHz 10 W
Times: Various
Talkback: ON4KST, maybe Zello

Call: G4ZTR
Locator: JO01KW
Bands: 1.3GHz 300w 2m dish
2.32GHz ~8w 2m dish
Times: throughout
Talkback: ON4KST

Callsign: G3YJR
Locator: IO93FJ
Bands: 1.3GHz 8W 33 el Wimo
              2.32GHz 25W 40 el Wimo
Times: Various throughout
Talkback: ON4KST

Callsign: GD8EXI
Locator: IO74PC
Bands:
1.3GHz 400 watts 60 ele Yagi
Times: Only first 2 hours unless conditions are very good.
Talkback: CQ and KST.

Callsign: GW4MBS
Locator: IO71XW
Bands: 1.3GHz 200 watts 35-el Yagi
Times: Most of time other than tea breaks
Talkback: KST2ME or email

Callsign: G3XDY
Locator: JO02OB
Bands: 1.3GHz 400W 4 x 23 el
              2.30/2.32GHz 200W 0.8m dish
             3.4GHz 20W 0.8m dish
Times: Various throughout
Talkback: ON4KST, CQ on 1.3GHz, Zello SHF Chat

73

John G3XDY
UKuG Contest Manager


Re: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

Mario Roessler, DH5YM
 

You may also look for activity from JO60/61 and around since there is a local contest here: https://dl0tud.tu-dresden.de/wordpress/index.php/dur/


Re: Wimo 13cms yagi

John Lemay
 

I have plenty of that “older” cable here, and some is in use – round the rotator for example.

 

It seems far more reliable than some of the modern flexible offerings that use paper-thin foil as an excuse for a shield.

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of John Quarmby via Groups.Io
Sent: 16 November 2019 11:23
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Wimo 13cms yagi

 

The older Andrews FHJ4-50, a predecessor to LDF4-50, has helical corrugation of the outer, very obvious when you inspect the interior of the connectors used on it which are also helically grooved. I think it dates back to the late 70s, so not seen much these days.

 

73

 

John G3XDY

 

 

 

Sent from my Samsung Galaxy smartphone.

 

-------- Original message --------

From: "alwyn.seeds1" <a.seeds@...>

Date: 16/11/2019 10:23 (GMT+00:00)

To: "UK Microwaves groups.io" <UKMicrowaves@groups.io>

Subject: Re: [UKMicrowaves] Wimo 13cms yagi

 

Dear All,

 

Cable and connectors.

 

I have measured very deep (20dB) suck-outs and corresponding reflection spikes around 2.3GHz on some samples of Ecoflex 15.

 

I have also measured severe suck-outs, but usually above 3 GHz, on poor quality N-Type connectors.

 

Definitely check your cable and connectors carefully, before working on the aerial.

 

Regarding the comment on “Heliax”, I do not agree. 

 

All foamed dielectric solid outer cables that I have seen do not have helical corrugations.

 

I have measured many samples of these cables up to their rated frequencies and above.

 

The large LCF-78 types are rated to 6GHz and have no problems at all at 2.3GHz.

 

The upper frequency limit is normally set by circumferential modes in the cable- the spacing between the corrugations is chosen so that the periodic feedback from these occurs above this frequency.

 

Regards,

 

Alwyn G8DOH

 

 

_____________________________________________________

 

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: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

John Lemay
 

Sorry to hear that Ralph, I always look forward to skeds with you.

 

Hope you can soon get back to normal.

 

Regards

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Ralph via Groups.Io
Sent: 16 November 2019 11:32
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

 

Unfortunately I will again not be QRV for the contest on Sunday 17th November.

 

Medication is taking away my ability to concentrate properly....... hope my next visit to

The Hospital will correct this.

 

73 and good luck to those taking part, Good DX !

 

Ralph G4ALY

 

 

Sent from Mail for Windows 10

 


Re: Wimo 13cms aerial VSWR

G0FVI
 

Just got into microwaves here, I use both a cheap Chinese vna, and a combination of an rf bridge/noise source/sdr receiver. They both show pretty close agreement up to cutoff of the rf Bridge assembly (1.5 Ghz). Would be interesting to compare them beside a decent setup, suffice to say swr lights on my sg lab transverters (2.4 and 1.3Ghz) are always happy. 
As regards the wimo, I would say do check all the elements too. I have a 37 ele recently aquired for 23cm. Two of the elements had been placed in wrong order (might have been previous owner!), causing the useable bandwidth to become very narrow. 

Sent from my Huawei phone


-------- Original Message --------
Subject: Re: [UKMicrowaves] Wimo 13cms aerial VSWR
From: "alwyn.seeds1"
To: "UK Microwaves groups.io"
CC:

Dear All,

Yes, I have always liked the HP8753, but they are not cheap.

Although it is only a scalar analyser, the Anritsu S331 is pretty useful for aerial adjustment.

Also, it’s intended for use by riggers, so is compact lightweight and battery powered, so handy in the field.

A few hundred pounds on e-bay is the typical price.

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: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

Ralph
 

Unfortunately I will again not be QRV for the contest on Sunday 17th November.

 

Medication is taking away my ability to concentrate properly....... hope my next visit to

The Hospital will correct this.

 

73 and good luck to those taking part, Good DX !

 

Ralph G4ALY

 

 

Sent from Mail for Windows 10

 


Re: Wimo 13cms yagi

John Quarmby
 

The older Andrews FHJ4-50, a predecessor to LDF4-50, has helical corrugation of the outer, very obvious when you inspect the interior of the connectors used on it which are also helically grooved. I think it dates back to the late 70s, so not seen much these days.

73

John G3XDY



Sent from my Samsung Galaxy smartphone.

-------- Original message --------
From: "alwyn.seeds1" <a.seeds@...>
Date: 16/11/2019 10:23 (GMT+00:00)
To: "UK Microwaves groups.io" <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Wimo 13cms yagi

Dear All,

Cable and connectors.

I have measured very deep (20dB) suck-outs and corresponding reflection spikes around 2.3GHz on some samples of Ecoflex 15.

I have also measured severe suck-outs, but usually above 3 GHz, on poor quality N-Type connectors.

Definitely check your cable and connectors carefully, before working on the aerial.

Regarding the comment on “Heliax”, I do not agree. 

All foamed dielectric solid outer cables that I have seen do not have helical corrugations.

I have measured many samples of these cables up to their rated frequencies and above.

The large LCF-78 types are rated to 6GHz and have no problems at all at 2.3GHz.

The upper frequency limit is normally set by circumferential modes in the cable- the spacing between the corrugations is chosen so that the periodic feedback from these occurs above this frequency.

Regards,

Alwyn G8DOH

 
_____________________________________________________

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: Wimo 13cms yagi

John Lemay
 

Hello Alwyn

 

I’m interested in your comment about connectors because very recently I had a problem with what looked like, at first sight, a decent quality 50ohm N type termination (male):

 

It showed a good return loss to around 2GHz, becoming very poor (-6dB) around 2.5GHz and then improving significantly above that frequency. Is that what is called “suck out” ?

 

On inspection I decided that the pin was making good contact and so was the screw ring. But the more important inner fixed ring was sometimes not making contact – which I proved by carefully making it slightly oval – problem (crudely) solved.

 

It makes me consider that plugs that have the inner ring split into “fingers” are a better bet ?

 

Regards

 

John

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of alwyn.seeds1
Sent: 16 November 2019 10:23
To: UK Microwaves groups.io
Subject: Re: [UKMicrowaves] Wimo 13cms yagi

 

Dear All,

 

Cable and connectors.

 

I have measured very deep (20dB) suck-outs and corresponding reflection spikes around 2.3GHz on some samples of Ecoflex 15.

 

I have also measured severe suck-outs, but usually above 3 GHz, on poor quality N-Type connectors.

 

Definitely check your cable and connectors carefully, before working on the aerial.

 

Regarding the comment on “Heliax”, I do not agree. 

 

All foamed dielectric solid outer cables that I have seen do not have helical corrugations.

 

I have measured many samples of these cables up to their rated frequencies and above.

 

The large LCF-78 types are rated to 6GHz and have no problems at all at 2.3GHz.

 

The upper frequency limit is normally set by circumferential modes in the cable- the spacing between the corrugations is chosen so that the periodic feedback from these occurs above this frequency.

 

Regards,

 

Alwyn G8DOH

 

 

_____________________________________________________

 

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: Wimo 13cms yagi

DD1US
 

Dear all,

 

I would like to add:

 

Do not use right angle adapters unless they are of proven excellent quality.

 

They can create resonances at 23cm band and higher …

 

Kind regards

 

Matthias

 

www.dd1us.de

 

 

Von: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Im Auftrag von alwyn.seeds1
Gesendet: Samstag, 16. November 2019 11:23
An: UK Microwaves groups.io <UKMicrowaves@groups.io>
Betreff: Re: [UKMicrowaves] Wimo 13cms yagi

 

Dear All,

 

Cable and connectors.

 

I have measured very deep (20dB) suck-outs and corresponding reflection spikes around 2.3GHz on some samples of Ecoflex 15.

 

I have also measured severe suck-outs, but usually above 3 GHz, on poor quality N-Type connectors.

 

Definitely check your cable and connectors carefully, before working on the aerial.

 

Regarding the comment on “Heliax”, I do not agree. 

 

All foamed dielectric solid outer cables that I have seen do not have helical corrugations.

 

I have measured many samples of these cables up to their rated frequencies and above.

 

The large LCF-78 types are rated to 6GHz and have no problems at all at 2.3GHz.

 

The upper frequency limit is normally set by circumferential modes in the cable- the spacing between the corrugations is chosen so that the periodic feedback from these occurs above this frequency.

 

Regards,

 

Alwyn G8DOH

 

 

_____________________________________________________

 

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.

_____________________________________________________