Date   

Life is full of surprises

Andy G4JNT
 
Edited

100dB attenuator made up from six PI  stages of ~16.7dB each using standard 0805 resistors
I measured its frequency response and was more than a bit surprised how good it was, maintaining to within 1dB of the design value.


Have a guess what it's upper frequency limit is - ie where the loss has changed by more than a couple of dB.


Re: 9 and 6 at OHM?

Nicholas Shaxted
 

….and the tie-wraps are there to keep the pigeons off

 

Nick – g4ogi

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of John Fell via groups.io
Sent: 16 May 2021 12:49
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 9 and 6 at OHM?

 

Hi Ben,

ZME now solid copy here .

Pics of my 6cm feed sharing with 10GHHz LNB on my masthead 60cm offset .

Have raised mast so dish is approx 9m agl.QTH 66m asl.

 

6cm feed is a Super VE4MA , with a Franco board /G4DDK modified first stage (NF 1.3dB ) into a 2 stage Mod amp ERA1 based and down to shack via 25 of Sat TV cable into my GPS refed. DB6NT Transverter .

 

73

John

G0API

 

On Sun, 16 May 2021 at 13:00, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:

Just shows what a dish can do. 
Just tried holding it in front of ant and big signal of OHM.

 

 


Re: 9 and 6 at OHM?

John Fell
 
Edited

Hi Ben,
ZME now solid copy here .
Pics of my 6cm feed sharing with 10GHHz LNB on my masthead 60cm offset .
Have raised mast so dish is approx 9m agl.QTH 66m asl.

6cm feed is a Super VE4MA , with a Franco board /G4DDK modified first stage (NF 1.3dB ) into a 2 stage Mod amp ERA1 based and down to shack via 25 of Sat TV cable into my GPS refed. DB6NT Transverter .

73
John
G0API

On Sun, 16 May 2021 at 13:00, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Just shows what a dish can do. 
Just tried holding it in front of ant and big signal of OHM.



Re: 9 and 6 at OHM?

militaryoperator
 

Just shows what a dish can do. 
Just tried holding it in front of ant and big signal of OHM.



Re: 9 and 6 at OHM?

militaryoperator
 

can u hear me 10 up from ZME?
_._,_._,_
call s20


Re: 9 and 6 at OHM?

Graham G3VKV
 

you have more rain down your end John - blanket of light cloud up here - high up
need something more solid to scatter back in your direction
Plenty of scatter on 9cms OHM here
Graham 
IO81XV35


Re: 9 and 6 at OHM?

John Fell
 

Nothing seen here Graham - beacons still going ....

73
John
G0API
IO80XS77JR

On Sun, 16 May 2021 at 12:26, Graham G3VKV via groups.io <g3vkv=btinternet.com@groups.io> wrote:
off now - can hear OHM also but screened by hills - rain clouds high up now
not too good for RS

Graham


Re: 9 and 6 at OHM?

Graham G3VKV
 

off now - can hear OHM also but screened by hills - rain clouds high up now
not too good for RS

Graham


Re: 9 and 6 at OHM?

Graham G3VKV
 

OK John


Re: 9 and 6 at OHM?

Graham G3VKV
 

Martyn G3ZME/P is on Brown Clee at the moment on 24GHZ - 59 here when he points this way

Graham G3VKV


Re: 9 and 6 at OHM?

John Fell
 

Not seeing you Graham - try again ?

John
G0API

On Sun, 16 May 2021 at 12:12, Graham G3VKV via groups.io <g3vkv=btinternet.com@groups.io> wrote:
can u hear me 10 up from ZME?


OHM and ZME

John Fell
 

Have been looking for MCB on 10Ghz - nothing conclusive yet on .890MHz .
The 2 plots below show OHM and SCC/ZME - I had Elevation offset on previous pics , so not showing the full signal levels .RS influences on ZME/OHM  but SCC at 22km LOS is on normal .905 frequency .

73
John
G0API


Re: 9 and 6 at OHM?

Graham G3VKV
 

can u hear me 10 up from ZME?


Re: 9 and 6 at OHM?

militaryoperator
 


ZME 9++ here Ben on 6cms
  Graham G3VKV



Gosh, I must be doing something wrong here Graham. I might as well give up !!!!! HI.

Ben


Re: GB3ZME

militaryoperator
 

Hi Ben  (again) ,

Wrong beacon in my pic - below is ZME .Around 5760.907MHz today .

73
John
G0API

Well, the ZME keying might be a give away John but the f difference is probably the error in the ADF oscillator and the RSP2 set. 

cheers, Ben.


Re: 9 and 6 at OHM?

Graham G3VKV
 

ZME 9++ here Ben on 6cms
  Graham G3VKV


GB3ZME

John Fell
 



Hi Ben  (again) ,

Wrong beacon in my pic - below is ZME .Around 5760.907MHz today .

73
John
G0API


Re: 9 and 6 at OHM?

militaryoperator
 
Edited

Getting ZME via rainscatter, nice warbling note on it. 


Re: 9 and 6 at OHM?

militaryoperator
 

Hi Ben,
ZME is running on 6cm .
Not the strongest of signals today .73
John
G0API

Just popping up now and then. 
Ben.

Screenshot-2021-05-16-115722.png


Re: 9 and 6 at OHM?

militaryoperator
 

Yes.
On an old house that is the community centre where the club QTH is situated

Andy
--------------------

Thanks Andy. In fact, I can just see ZME, coming in and out of the noise but weaker than it is on 9. 
Ben.Screenshot-2021-05-16-115244.png

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