Date   

Re: Helix - was Microwave oven test

Colin Ranson
 

Hi Andrew,

 

Just as an aside I use a separate uplink antenna in the form of a 16 turn helix RHCP (VAS Super Canon) with an impedance match modification. It sits next to the main 80cm RX dish and is so small it sits on a tiny mount and at only 15 inches long it can hardly be seen.

 

Best regards,

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: G8TZJ via groups.io
Sent: 15 October 2020 18:35
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Helix - was Microwave oven test

 

Thanks for all the advice on plastics for the helix. Attached should hopefully be a picture of the finished Helix with a LNB. I configured it above the LNB, because if the helix is in front of the LNB, there is a 2dB loss of signal into the LNB from QO-100. The SWR (I don’t have a VNA) was 1.15:1 without the LNB present. With the LNB it increased to 1.25:1 and when sprayed with water (to simulate rain) it was 1.2:1. Interesting that the SWR improved with water.

 However when it was mounted on my dish (a 1m offset) it returned a signal 2-3 dB worse through QO-100 than my BaMaTech patch feed. Removing the LNB so I could drop the Helix nearer to the dish’s focal point, improved things so it was now equal to my BaMaTech patch feed. Had I been able to drop it fully into the focal point, it may have been better. I then tried a POTY feed in place of my BaMaTech patch feed and it was 2-3 dB better than the BaMaTech. In fact Leila jumped on my test signal. Same power used throughout.

 So I’m not going to use a Helix. I may eventually use a POTY but that needs a few more changes to accommodate it.

73 Andrew G8TZJ

 


Re: Helix - was Microwave oven test

G8TZJ
 

Thanks for all the advice on plastics for the helix. Attached should hopefully be a picture of the finished Helix with a LNB. I configured it above the LNB, because if the helix is in front of the LNB, there is a 2dB loss of signal into the LNB from QO-100. The SWR (I don’t have a VNA) was 1.15:1 without the LNB present. With the LNB it increased to 1.25:1 and when sprayed with water (to simulate rain) it was 1.2:1. Interesting that the SWR improved with water.

 However when it was mounted on my dish (a 1m offset) it returned a signal 2-3 dB worse through QO-100 than my BaMaTech patch feed. Removing the LNB so I could drop the Helix nearer to the dish’s focal point, improved things so it was now equal to my BaMaTech patch feed. Had I been able to drop it fully into the focal point, it may have been better. I then tried a POTY feed in place of my BaMaTech patch feed and it was 2-3 dB better than the BaMaTech. In fact Leila jumped on my test signal. Same power used throughout.

 So I’m not going to use a Helix. I may eventually use a POTY but that needs a few more changes to accommodate it.

73 Andrew G8TZJ



Re: Activity List for the UK Microwave Group 24/47/76GHz Contests - Sunday 18th October

G1DFL
 

Callsign: G1DFL/P
Locator: Roving from IO91LO78 to 3-4 other sites in central IO91 
(depends where everyone else goes?!)
Bands: 24GHz 250mW 30cm PF dish
Talkback: 144.390MHz preferred, KST, Zello (SHF Chat), 07713 432632
Times: 11am BST onwards


On Thursday, October 15, 2020, 05:37:37 PM GMT+1, Phil Boorman G0JBA via groups.io <g0jba@...> wrote:


I will be on from home 


Callsign: G0JBA
Locator: JO01PG63
Bands: 24GHz    1.8W 40cm offset dish
Talkback: ON4KST
Times: Various depending on activity

Cheers
Phil G0JBA


On Thursday, October 15, 2020, 5:21 pm, Noel G8GTZ <noel@...> wrote:

I will be out and about roving with 24 GHz, 76 GHz and 122 GHz

Callsign: G8GTZ/P

Locator: Roving around IO91GI and neighbouring squares
Bands: 24 GHz 1 watt 30 cm dish, 76GHz UK loan gear which appears to be low on Tx and 122 GHz VK3CV rig 30 cm dish
Talkback: ON4KST, 144.390MHz, Zello? and mobile
Times: 10.30 BST onwards

73, Noel G8GTZ


Re: QO-100 and SOTA this morning 14th Oct

Graham G3VKV
 

Hi Nick,
Missed you on your last couple of outings,
During the night QO100 is usually empty - starts to shut down when Europe goes to bed !!
I use a modified Octagon + GPSDO 1249MHz IF  - modified Kuhne 2320 kit transverter +GPSDO
up from 144MHz  - driven by an Icom 9700 in satellite mode (injected reference oscillator)
All tuning with one control - KHz  on dial same on up/down   poty feed + 70cm prime focus
Cheaper way would be to use a Pluto + GPSDO  and referenced LNB (but then you would need a computer)

Graham G3VKV


Re: Activity List for the UK Microwave Group 24/47/76GHz Contests - Sunday 18th October

Phil Boorman G0JBA
 

I will be on from home 


Callsign: G0JBA
Locator: JO01PG63
Bands: 24GHz    1.8W 40cm offset dish
Talkback: ON4KST
Times: Various depending on activity

Cheers
Phil G0JBA


On Thursday, October 15, 2020, 5:21 pm, Noel G8GTZ <noel@...> wrote:

I will be out and about roving with 24 GHz, 76 GHz and 122 GHz

Callsign: G8GTZ/P

Locator: Roving around IO91GI and neighbouring squares
Bands: 24 GHz 1 watt 30 cm dish, 76GHz UK loan gear which appears to be low on Tx and 122 GHz VK3CV rig 30 cm dish
Talkback: ON4KST, 144.390MHz, Zello? and mobile
Times: 10.30 BST onwards

73, Noel G8GTZ


Re: Activity List for the UK Microwave Group 24/47/76GHz Contests - Sunday 18th October

Noel G8GTZ
 

I will be out and about roving with 24 GHz, 76 GHz and 122 GHz

Callsign: G8GTZ/P

Locator: Roving around IO91GI and neighbouring squares
Bands: 24 GHz 1 watt 30 cm dish, 76GHz UK loan gear which appears to be low on Tx and 122 GHz VK3CV rig 30 cm dish
Talkback: ON4KST, 144.390MHz, Zello? and mobile
Times: 10.30 BST onwards

73, Noel G8GTZ


Re: 10 GHz Portable Transceiver

Paul G8AQA
 

Hi David,

I will be using WG17 on my EME system because the TWT PA,  and the feed are WG17.  I have WG17 switches. I will need to build a preamp and could do with couplers for testing.  I have plenty of E and H bends if anyone needs any.
Would a visit be possible with social distancing, quarantining and outside etc?  Need to choose good weather.

73
Paul

On 15/10/2020 09:10, DAVID G4ASR via groups.io wrote:
As it happens I was recently was given 2 x "White Boxes"  - never used and lots of WG17 guide (each piece circa 1 metre in length) and a large box of Andrew WG17-elliptical wg transitions and lots of other WG17 components. I turned down the huge coil of elliptical guide.  

Is there any interest in WG17 out there? 

73 David G4ASR







Re: 10 GHz Portable Transceiver

neil whiting
 

Hi Bob,

I never used waveguide on my 3cm system, which worked very well.
I had a similar length of RG402 from the PA to the SMA on the feed, it didn't lose me much.
I actually put the preamp at the feed with the SMA relay, so didn't lose anything on RX.
Another length of RG402 took the preamp output back to the transverter box.

Good luck with your system.

73, Neil  G4BRK




On Thu, 15 Oct 2020 at 08:27, Bob_G1ZJP <R_Offer@...> wrote:

Morning David

 

I’m preparing a 10G station but, being a numb-skull, I don’t know what is needed to get from my Kuhne G2 to WG and if it’s SMA/cable/SMA/transition if that would be as lossy as/more lossy than a short run of RG401 – I was planning on running the box right at the masthead/dish so probably a max of 500mm of the RG401.

Any advice is very welcome, please.  It’s all a very much unknown area for me at the moment.

Cheers for now, stay safe

Bob, G1ZJP / M1MHZ

 

 

 

From: DAVID G4ASR via groups.io
Sent: 15 October 2020 09:10
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 10 GHz Portable Transceiver

 

As it happens I was recently was given 2 x "White Boxes"  - never used and lots of WG17 guide (each piece circa 1 metre in length) and a large box of Andrew WG17-elliptical wg transitions and lots of other WG17 components. I turned down the huge coil of elliptical guide.  

Is there any interest in WG17 out there? 

73 David G4ASR




 


Re: 10 GHz Portable Transceiver

militaryoperator
 

Morning David
 
I’m preparing a 10G station but, being a numb-skull, I don’t know what is needed to get from my Kuhne G2 to WG and if it’s SMA/cable/SMA/transition if that would be as lossy as/more lossy than a short run of RG401 – I was planning on running the box right at the masthead/dish so probably a max of 500mm of the RG401.
Any advice is very welcome, please.  It’s all a very much unknown area for me at the moment.
Cheers for now, stay safe
Bob, G1ZJP / M1MHZ
 
DSCF3081.JPG
This is one of mine. This is in measuring mode. When in use transverter, in ali box, 
is closer to dish feed and the cable from transition goes to box directly. 

Ben G4BXD


Re: 10 GHz Portable Transceiver

DAVID G4ASR
 

As it happens I was recently was given 2 x "White Boxes"  - never used and lots of WG17 guide (each piece circa 1 metre in length) and a large box of Andrew WG17-elliptical wg transitions and lots of other WG17 components. I turned down the huge coil of elliptical guide.  

Is there any interest in WG17 out there? 

73 David G4ASR






Re: QO-100 and SOTA this morning 14th Oct

Nick Gregory G0HIK
 

Hi Paul,

Thanks for taking the time to have a listen Paul.
I don't know why there are so many Germans, but I'm sure glad that they speak very good English.
 I don't have a spectrum scope, so I was unaware there were so few stations on. I've been told that a week day is not the busiest time on the satellite, which makes sense. I cant really go out portable later in the day and I usually do other things at weekends.
As Dave pointed out there are plenty of other countries represented, I've got PY, YO, R, SV,IT9,ZS and many more in the log.
I have found netting hard, I usually stay on one frequency and let stations come to me. I guess the difficulty is comparing the natural pitch of your voice to the the other stations voice. That doesn't explain why some stations come on a couple of kHz away though.
I'd love to know how to do it correctly.

I'm hoping to be out on another SOTA this morning, High Rigg near to Keswick around 11:15 local time.

Nick G0HIK
 

  


Re: QO-100 and SOTA this morning 14th Oct

Dave - G4RQI
 

Hello,

 

Perhaps the DL’s are just more active... this year I have worked on SSB/CW HS, 4X, FR, ZS, HZ, V55, PY, 5B4, 9K2, TR8, ST, and yes a few DL’s too so other countries are active... As I was switching off tonight GU6EFB was working a PY.

 

73 David

Sent from Mail for Windows 10

 

From: Colin Ranson
Sent: 14 October 2020 22:10
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] QO-100 and SOTA this morning 14th Oct

 

Paul,   Agree most users seem to be German but I have heard one South American and a smattering of British.  Some Italians and other Europeans but are few and far between.   Is it because QO-100 is an Amsat -DL project ?

 

I’ll get back on the satelite soon, been rather busy.

 

Regards,   Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Paul Randall G3NJV
Sent: 14 October 2020 21:39
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] QO-100 and SOTA this morning 14th Oct

 

Nick, I listened in this morning using the Goonhilly SDR. Heard you working several stations.
Is there a reason netting on the satellite is so bad? Some stations off by a kHz. Tx/Rx
Also interesting that apart from you, almost everyone on there was speaking German.
I was amazed in the hour I listened, to hear so few stations. SDR showed quite a few "odd" carriers, sweeps, blobs, but as I said, apart from you, the only other stations heard were from Germany.
With such a big chunk of the globe covered, I found this a bit odd.
Perhaps it livens up at other times.
What do others hear?
Paul G3NJV

 

 


Re: QO-100 and SOTA this morning 14th Oct

Colin Ranson
 

Paul,   Agree most users seem to be German but I have heard one South American and a smattering of British.  Some Italians and other Europeans but are few and far between.   Is it because QO-100 is an Amsat -DL project ?

 

I’ll get back on the satelite soon, been rather busy.

 

Regards,   Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Paul Randall G3NJV
Sent: 14 October 2020 21:39
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] QO-100 and SOTA this morning 14th Oct

 

Nick, I listened in this morning using the Goonhilly SDR. Heard you working several stations.
Is there a reason netting on the satellite is so bad? Some stations off by a kHz. Tx/Rx
Also interesting that apart from you, almost everyone on there was speaking German.
I was amazed in the hour I listened, to hear so few stations. SDR showed quite a few "odd" carriers, sweeps, blobs, but as I said, apart from you, the only other stations heard were from Germany.
With such a big chunk of the globe covered, I found this a bit odd.
Perhaps it livens up at other times.
What do others hear?
Paul G3NJV

 


Re: QO-100 and SOTA this morning 14th Oct

Paul Randall G3NJV
 

Nick, I listened in this morning using the Goonhilly SDR. Heard you working several stations.
Is there a reason netting on the satellite is so bad? Some stations off by a kHz. Tx/Rx
Also interesting that apart from you, almost everyone on there was speaking German.
I was amazed in the hour I listened, to hear so few stations. SDR showed quite a few "odd" carriers, sweeps, blobs, but as I said, apart from you, the only other stations heard were from Germany.
With such a big chunk of the globe covered, I found this a bit odd.
Perhaps it livens up at other times.
What do others hear?
Paul G3NJV


Re: Activity List for the UK Microwave Group 24/47/76GHz Contests - Sunday 18th October

Dave G1EHF
 

I will be out and about, roving with 24 GHz and 122 GHz

Callsign: G1EHF/P

Locator: IO91GI35 and others
Bands: 24 GHz 100 mW 30 cm dish, 122 GHz VK3CV rig 30 cm dish
Talkback: ON4KST, 144.390MHz
Times: 10.30 BST onwards

73, Dave G1EHF


QO-100 and SOTA this morning 14th Oct

Nick Gregory G0HIK
 

I'm going to be on QO-100 this morning from SOTA Rayrigg Forrest in the Lakes.

Around 11:00 local  +/- 2400.200 .
It will be great to work my usual contacts and any new ones.

73's

Nick G0HIK


Re: Unidentified Connector

Robin Szemeti - G1YFG
 

Unless I am mistaken ... SMP and OSP are very similar but different.  OSP has the pin in the plug ... SMP and P-SMP have the pin in the socket?

On Tue, 13 Oct 2020 at 18:46, Murray Niman <g6jyb@...> wrote:

As one other poster mentioned

The original connector is in the photo MaCom/Omnispectra OSP (aka SMP)  - a blindmate SMA

There is also a smaller OSSP / SSMP - a blindmate miniature variant 

Both of them were evaluated as really good for 10GHz T/R modules some years ago - when there was less connector choice than now 

73

 Murray G6JYB


--
Robin Szemeti - G1YFG


Re: Unidentified Connector

Murray Niman
 


As one other poster mentioned

The original connector is in the photo MaCom/Omnispectra OSP (aka SMP)  - a blindmate SMA

There is also a smaller OSSP / SSMP - a blindmate miniature variant 

Both of them were evaluated as really good for 10GHz T/R modules some years ago - when there was less connector choice than now 

73

 Murray G6JYB


Re: Unidentified Connector

 

I have a few 4.1-9.5 connectors, (and a 6dB attenuator) if anybody has a use for them. They were in the 1970's Plisch TV amplifiers, a few of which made it into amateur service.


Re: 10 GHz Portable Transceiver

Adrian G4UVZ
 

Even as I type the rig is on it's way to a new home in the Cambridge area!

3681 - 3700 of 62461