Date   

Re: RG405 Cable

Robin Szemeti - G1YFG
 

Denis,

RG401 is very nice, the problem I always have is finding suitable connectors at sensible prices! Rallies used to be an excellent source of ex-military RG401 and connectors, but not had any of those in ages!


On Mon, 14 Dec 2020 at 13:44, DF6NA Rainer <df6na@...> wrote:
Hi Denis,

RG401U is easy to use. I have some surplus here.

73, Rainer


Am 14.12.2020 um 14:33 schrieb Phil Guttridge G3TCU:
Hi Denis,

I've  used 'real' RG401 and haven't found any trouble with bending it to the required route by hand. I just looked for any odd things of the right diameter to bend it around.

73, Phil G3TCU


On 14/12/2020 12:09, Denis Stanton G0OLX via groups.io wrote:
Hi All
Thanks Robin for info on Dutch company.
I will look into that.
Another question
Has anybody used RG401 semi ridgid
Most of the other cable have been RG402

RG 401 looks to have a far lower loss at 10 GHz but wondering about the bending radius

Best 73's

Denis
G0OLX

Virus-free. www.avg.com



--
Robin Szemeti - G1YFG


Re: RG405 Cable

Robin Szemeti - G1YFG
 

Ah, my apologies ... I thought the OP was looking for RG405,  I *think* he is looking for RG405/U  which is different.

On Mon, 14 Dec 2020 at 13:44, DF6NA Rainer <df6na@...> wrote:
Hi Denis,

RG401U is easy to use. I have some surplus here.

73, Rainer


Am 14.12.2020 um 14:33 schrieb Phil Guttridge G3TCU:
Hi Denis,

I've  used 'real' RG401 and haven't found any trouble with bending it to the required route by hand. I just looked for any odd things of the right diameter to bend it around.

73, Phil G3TCU


On 14/12/2020 12:09, Denis Stanton G0OLX via groups.io wrote:
Hi All
Thanks Robin for info on Dutch company.
I will look into that.
Another question
Has anybody used RG401 semi ridgid
Most of the other cable have been RG402

RG 401 looks to have a far lower loss at 10 GHz but wondering about the bending radius

Best 73's

Denis
G0OLX

Virus-free. www.avg.com



--
Robin Szemeti - G1YFG


Re: RG405 Cable

DF6NA Rainer
 

Hi Denis,

RG401U is easy to use. I have some surplus here.

73, Rainer


Am 14.12.2020 um 14:33 schrieb Phil Guttridge G3TCU:

Hi Denis,

I've  used 'real' RG401 and haven't found any trouble with bending it to the required route by hand. I just looked for any odd things of the right diameter to bend it around.

73, Phil G3TCU


On 14/12/2020 12:09, Denis Stanton G0OLX via groups.io wrote:
Hi All
Thanks Robin for info on Dutch company.
I will look into that.
Another question
Has anybody used RG401 semi ridgid
Most of the other cable have been RG402

RG 401 looks to have a far lower loss at 10 GHz but wondering about the bending radius

Best 73's

Denis
G0OLX

Virus-free. www.avg.com



Re: RG405 Cable

Phil Guttridge G3TCU
 

Hi Denis,

I've  used 'real' RG401 and haven't found any trouble with bending it to the required route by hand. I just looked for any odd things of the right diameter to bend it around.

73, Phil G3TCU


On 14/12/2020 12:09, Denis Stanton G0OLX via groups.io wrote:
Hi All
Thanks Robin for info on Dutch company.
I will look into that.
Another question
Has anybody used RG401 semi ridgid
Most of the other cable have been RG402

RG 401 looks to have a far lower loss at 10 GHz but wondering about the bending radius

Best 73's

Denis
G0OLX

Virus-free. www.avg.com


Re: RG405 Cable

Bob_G1ZJP
 

Denis

 

Here is the spec sheet for RG401, http://www.farnell.com/datasheets/1600437.pdf  On advice, for finishing off my 10GHz project, I purchased several pieces from France – of those several pieces came with rather nice 4.3/10 connectors [frequently referred to a mini 7-16,] similar to this R183010007W   Datasheet (farnell.com) [note these are only spedc’d to 6GHz]  I guess that increased the P&P a little 😊 I’ve only seen 1m lengths for sale in the UK.  Maybe one of our learned friends can help more?

 

73

Bob, G1ZJP

 

 

 

From: Denis Stanton G0OLX
Sent: 14 December 2020 12:09
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] RG405 Cable

 

Hi All
Thanks Robin for info on Dutch company.
I will look into that.
Another question
Has anybody used RG401 semi ridgid
Most of the other cable have been RG402

RG 401 looks to have a far lower loss at 10 GHz but wondering about the bending radius

Best 73's

Denis
G0OLX

 


Re: RG405 Cable

Denis Stanton G0OLX
 

Steve
Thank you 
I was wondering about how I would go about bending it
Back to RG402 for the feed from TWT output to SMA relay and 3 dB of loss
Best 73’s
Denis
G0OLX


On 14 Dec 2020, at 13:06, Stephen Tompsett <stephen@...> wrote:



Assuming that you are using real solid copper outer cable, forget about the 'semi' for RG401 - you need a pipe bender!


On 14/12/2020 12:09, Denis Stanton G0OLX wrote:
Hi All
Thanks Robin for info on Dutch company.
I will look into that.
Another question
Has anybody used RG401 semi ridgid
Most of the other cable have been RG402

RG 401 looks to have a far lower loss at 10 GHz but wondering about the bending radius

Best 73's

Denis
G0OLX
-- 
Stephen Tompsett (G8LYB)
Tel: 01788 578940
Mob: 07956 855816


Re: RG405 Cable

Stephen Tompsett
 

Assuming that you are using real solid copper outer cable, forget about the 'semi' for RG401 - you need a pipe bender!


On 14/12/2020 12:09, Denis Stanton G0OLX wrote:
Hi All
Thanks Robin for info on Dutch company.
I will look into that.
Another question
Has anybody used RG401 semi ridgid
Most of the other cable have been RG402

RG 401 looks to have a far lower loss at 10 GHz but wondering about the bending radius

Best 73's

Denis
G0OLX
-- 
Stephen Tompsett (G8LYB)
Tel: 01788 578940
Mob: 07956 855816


Re: RG405 Cable

Denis Stanton G0OLX
 

Hi All
Thanks Robin for info on Dutch company.
I will look into that.
Another question
Has anybody used RG401 semi ridgid
Most of the other cable have been RG402

RG 401 looks to have a far lower loss at 10 GHz but wondering about the bending radius

Best 73's

Denis
G0OLX


Re: RG405 Cable

Robin Szemeti - G1YFG
 

Try the Dutch RF Shop if it has to be RG405:


Or Enigmashop if you can use something else.  2m of 405 sounds quite long and quite lossy ...


On Mon, 14 Dec 2020 at 11:37, Denis Stanton G0OLX <Stantondenis@...> wrote:
Hi all

I ordered, what I thought would be a 2 metre length of RG405 semi-ridgid cable from a well known supplier, i even rang the help line to ensure that it would be 2 metres long

This morning 2 by I metre lengths turned up.

Its now waiting to be collected with their returns number, at their cost as there tracking system shows my phone call and reason.

Will I ever get this project finished !!!!

Best 73's

Denis

G0OLX


--
Robin Szemeti - G1YFG


Re: Quick RX test at 3cms ?

Raymond Brooks
 

Thanks that's what I missed thermal noise, rather than system noise. Forgetting more than I know.

On 14 Dec 2020 11:07 am, Andy G4JNT <andy.g4jnt@...> wrote:
3kHz = 34dBHz
Thermal noise is -174 dBm/Hz so noise in 3kHz is -140dBm
You see 60dB S/N, so must have -80dBm

Of course, that's ignoring noise figure that will raise the base noise floor, but it's in that ball-park



Virus-free. www.avg.com

On Mon, 14 Dec 2020 at 10:49, Raymond Brooks <g8kps@...> wrote:
Hi Andy, how do you get from 60dB over noise in 3kHz to -80dBm, I think I must be missing something. 

On 13 Dec 2020 8:51 pm, Andy G4JNT <andy.g4jnt@...> wrote:
AH, OK.
Wnen I see S/N values quoted, automatically assume it's from an SDR screen in a bin of a few Hz width.

60dB in 3kHz is quite strong -80dBm



Virus-free. www.avg.com

On Sun, 13 Dec 2020 at 20:39, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:
3khz Andy.

Nick



--
Raymond G8KPS



--
Raymond G8KPS


RG405 Cable

Denis Stanton G0OLX
 

Hi all

I ordered, what I thought would be a 2 metre length of RG405 semi-ridgid cable from a well known supplier, i even rang the help line to ensure that it would be 2 metres long

This morning 2 by I metre lengths turned up.

Its now waiting to be collected with their returns number, at their cost as there tracking system shows my phone call and reason.

Will I ever get this project finished !!!!

Best 73's

Denis

G0OLX


Re: Quick RX test at 3cms ?

Andy G4JNT
 

3kHz = 34dBHz
Thermal noise is -174 dBm/Hz so noise in 3kHz is -140dBm
You see 60dB S/N, so must have -80dBm

Of course, that's ignoring noise figure that will raise the base noise floor, but it's in that ball-park



Virus-free. www.avg.com


On Mon, 14 Dec 2020 at 10:49, Raymond Brooks <g8kps@...> wrote:
Hi Andy, how do you get from 60dB over noise in 3kHz to -80dBm, I think I must be missing something. 

On 13 Dec 2020 8:51 pm, Andy G4JNT <andy.g4jnt@...> wrote:
AH, OK.
Wnen I see S/N values quoted, automatically assume it's from an SDR screen in a bin of a few Hz width.

60dB in 3kHz is quite strong -80dBm



Virus-free. www.avg.com

On Sun, 13 Dec 2020 at 20:39, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:
3khz Andy.

Nick



--
Raymond G8KPS


Re: Quick RX test at 3cms ?

Raymond Brooks
 

Hi Andy, how do you get from 60dB over noise in 3kHz to -80dBm, I think I must be missing something. 

On 13 Dec 2020 8:51 pm, Andy G4JNT <andy.g4jnt@...> wrote:
AH, OK.
Wnen I see S/N values quoted, automatically assume it's from an SDR screen in a bin of a few Hz width.

60dB in 3kHz is quite strong -80dBm



Virus-free. www.avg.com

On Sun, 13 Dec 2020 at 20:39, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:
3khz Andy.

Nick



--
Raymond G8KPS


Re: 23cm interference

militaryoperator
 

.. (their reaction was rather like the famous Python Sketch with John Cleese as a banker totally failing to grasp the concept of a Charity collector asking him for a donation. :-) 


I have the same trouble John. Are there no workhouses anymore? are there no chimneys that need sweeping?

Its give give give all the time.

bah humbug, I say. 

Ben.


Re: 23cm interference

alwyn.seeds1
 

Dear John,

I must buy myself the Monty Python series to refresh my memories.

However, my attempts to interest a moderately eminent employee of BT in the difficulties that their power line adapters were causing met a similar lack of comprehension.

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: 23cm interference

g4bao
 

Hi Dave
I found around 10 years ago that a very early version of the "Display Link" (The inventors of USB to VGA) adaptor,  wiped out 23cm here.
One of their tech guys gave me it to play with. No interest whatsoever from the company in my observations  ... (their reaction was rather like the famous Python Sketch with John Cleese as a banker totally failing to grasp the concept of a Charity collector asking him for a donation. :-)

I gave it him back!

Probably the same effect.

73
John   


Re: Quick RX test at 3cms ?

Andy G4JNT
 

AH, OK.
Wnen I see S/N values quoted, automatically assume it's from an SDR screen in a bin of a few Hz width.

60dB in 3kHz is quite strong -80dBm



Virus-free. www.avg.com


On Sun, 13 Dec 2020 at 20:39, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:
3khz Andy.

Nick


Re: Quick RX test at 3cms ?

Nick Gregory G0HIK
 

3khz Andy.

Nick


Re: Quick RX test at 3cms ?

Andy G4JNT
 

In what noise BW ?



On Sun, 13 Dec 2020 at 19:37, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:
OK, 60dB over the noise now.

I presume that is in the ball park and all is well.

Every day is a school day, thank you Andy.

Nick G0HIK


Re: Quick RX test at 3cms ?

Nick Gregory G0HIK
 

OK, 60dB over the noise now.

I presume that is in the ball park and all is well.

Every day is a school day, thank you Andy.

Nick G0HIK

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