Date   

Re: 28V PSU?

Mark - M0WGF
 

The Ericsson PSU are good value.  

You can adjust the output voltage up to 28.2V using a pot located under the heatsink.  I can't remember which one but I can open the unit and have a look if it's at all useful?

They run hot even under idle (approx 50C) so you need a fan to keep them cool a single fan over the top of the heatsink would do.  I used two fans which on hindsight was overkill. 

If you can find the same style of binding posts they screw tight into the original socket which is handy and saves some modifications.  

73 Mark
M0WGF


Re: G0MRF downconverter

Andy G4JNT
 

I think we're going round in circles
There is no problem

I only originally took issue with the comment that stated "mandated" in a set of guidelines that had no legal force.
If it had simply said users SHOULD be able to monitor their downlink while transmitting, and left it at that, honour would have been satisfied.



On Mon, 7 Sep 2020 at 11:03, John E. Beech <john@...> wrote:
Hi Andy,
            That's what I thought, so what's the problem/

de John G8SEQ

>  -------Original Message-------
>  From: Andy G4JNT <andy.g4jnt@...>
>  To: UK Microwaves groups.io <UKMicrowaves@groups.io>
>  Subject: Re: [UKMicrowaves] G0MRF downconverter
>  Sent: Sep 07 '20 10:25

>  It can't not count.
>  It's just receiver, like any other

>  Andy
www.g4jnt.com

>  On Mon, 7 Sep 2020 at 10:17, John E. Beech <john@...> wrote:

>  > Does using Goonhilly SDR count?
>  >
>  > de John G8SEQ
>  >
>  >> -------Original Message-------
>  >> From: Mike Willis <willis.mj@...>
>  >> To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
>  >> Subject: Re: [UKMicrowaves] G0MRF downconverter
>  >> Sent: Sep 06 '20 13:11
>  >>
>  >> But Andy,
>  >>
>  >> Its the rule. We might not like the rules but we have to follow
>  > them.
>  >> One of these is you need to be able to monitor your downlink
>  > while
>  >> transmitting. It's doesn't say listen, looking at a waterfall
>  > ought to
>  >> do. The ones sending dirty signals are generally those that are
>  > not
>  >> doing this. They go out and buy things expecting they will work
>  > and
>  >> not realising that they should not over drive amplifiers etc.
>  > Anyway,
>  >> it doesn't really matter what we think about these rules as
>  > AMSAT-DL
>  >> and the Sponsors have set rules for us to abide by, one of which
>  > is
>  >> "Full duplex operation is mandatory (you must be able to monitor
>  > your
>  >> own downlink while transmitting!)"
>  >>
>  >>
>  >
https://amsat-dl.org/en/p4-a-nb-transponder-bandplan-and-operating-guidelines/
>  >> --
>  >> Mike G0MJW
>  >>






Re: G0MRF downconverter

John E. Beech
 

Hi Andy,
That's what I thought, so what's the problem/

de John G8SEQ

-------Original Message-------
From: Andy G4JNT <andy.g4jnt@gmail.com>
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] G0MRF downconverter
Sent: Sep 07 '20 10:25

It can't not count.
It's just receiver, like any other

Andy
www.g4jnt.com

On Mon, 7 Sep 2020 at 10:17, John E. Beech <john@g8seq.com> wrote:

> Does using Goonhilly SDR count?
>
> de John G8SEQ
>
>> -------Original Message-------
>> From: Mike Willis <willis.mj@gmail.com>
>> To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
>> Subject: Re: [UKMicrowaves] G0MRF downconverter
>> Sent: Sep 06 '20 13:11
>>
>> But Andy,
>>
>> Its the rule. We might not like the rules but we have to follow
> them.
>> One of these is you need to be able to monitor your downlink
> while
>> transmitting. It's doesn't say listen, looking at a waterfall
> ought to
>> do. The ones sending dirty signals are generally those that are
> not
>> doing this. They go out and buy things expecting they will work
> and
>> not realising that they should not over drive amplifiers etc.
> Anyway,
>> it doesn't really matter what we think about these rules as
> AMSAT-DL
>> and the Sponsors have set rules for us to abide by, one of which
> is
>> "Full duplex operation is mandatory (you must be able to monitor
> your
>> own downlink while transmitting!)"
>>
>>
>
https://amsat-dl.org/en/p4-a-nb-transponder-bandplan-and-operating-guidelines/
>> --
>> Mike G0MJW
>>


Re: Earth stakes

John E. Beech
 

You can improve ground conductivity by watering with fertilizer. No good if it dries out until next time it rains!

de John G8SEQ

-------Original Message-------
From: Paul Randall G3NJV <paulfrandall@hotmail.com>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Earth stakes
Sent: Sep 06 '20 23:48

Using mains pressure water down a copper tube with handles so it can
be twisted about comes to mind. Stones are a problem.
Julian, unless you live on a salt bog or wet clay, try Plan B.

I echo Robins points and add the following.
An HF vertical will almost always do better with radials instead of
earth rods, unless you are on a bog or beach. Those who have worked
hard to get an efficient vertical often end up with 32, 64 or even
more radials. On topband, and I imagine even lower, do anything to
avoid relying on ground rods.
With no alternative, use whatever works in your location, but put in
as many as you can manage and water them, I recall suggestions to use
chemical additive - what??????

I use a vertical loop on top band, the trees I thought an obstacle
ended up supporting the loop - hell yes my 100W heats them up, but
enough escapes to make it a fantastic antenna, transatlantic most days
FT8, no ground needed.

Cheers,

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

FROM: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of
Robin Szemeti - G1YFG <robin@redpoint.org.uk>
SENT: 06 September 2020 19:09
TO: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
SUBJECT: Re: [UKMicrowaves] Earth stakes

You could just save the copper and effort and not bother?

Try measuring the actual impedance of an "earth stake" and it is
frequently in the hundreds or even thousands of ohms in stony ground.
At best, they help discharge a little static. On 160m, I radiate a
decent signal, and my ground system is bits of wire, fences and
associate bits of metalwork that I have been able to press into
service. The feed point impedance is quite low, I doubt an "earth
stake" would have any benefit at all.

On Sun, 6 Sep 2020 at 18:40, Reg Woolley via groups.io
<g8vhi=btinternet.com@groups.io> wrote:

> Hilti drills have an attachment that hammmer earth spikes in. Maybe
> worth trying your local hire shop. They go in real easy that way.
>
> Reg g8vhi
>
> Sent from Samsung tablet.
>
> -------- Original message --------
> From: Martin Phillips G4CIO <martin@douglas-phillips.org.uk>
> Date: 06/09/2020 18:10 (GMT+00:00)
> To: UKMicrowaves@groups.io
> Subject: Re: [UKMicrowaves] Earth stakes
>
> A very large SDS drill. They sometimes have them at bargain prices
> in Aldi. I've got a 1 m x 25 mm one.
>
> On 6/9/20 6:04 PM, g4zod@btinternet.com via groups.io wrote:
>
>> Not quite microwaves, but still radio.
>>
>> I have been trying to drive in earth stakes for my shack and HF
>> vertical.
>>
>> I have tried using a sharped rod and a club hammer to start the
>> hole ,but I am not really succeeding. (I also pour water into the
>> hole to soften things up whilst driving the rod.)
>>
>> I use 25 mm copper tubes and 10 mm copper coated rods.
>>
>> Any advice on the best way to get about a Metre into stoney soil?
>>
>> ( The Dragon will not be happy if I dig out large holes on "her
>> garden".
>>
>> Many thanks.
>>
>> G4ZOD
>>
>> Sent from BlueMail

--
Robin Szemeti - G1YFG


Re: G0MRF downconverter

Andy G4JNT
 

It can't not count.
It's just  receiver, like any other



On Mon, 7 Sep 2020 at 10:17, John E. Beech <john@...> wrote:
Does using Goonhilly SDR count?

de John G8SEQ

>  -------Original Message-------
>  From: Mike Willis <willis.mj@...>
>  To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
>  Subject: Re: [UKMicrowaves] G0MRF downconverter
>  Sent: Sep 06 '20 13:11

>  But Andy,

>  Its the rule. We might not like the rules but we have to follow them.
>  One of these is you need to be able to monitor your downlink while
>  transmitting. It's doesn't say listen, looking at a waterfall ought to
>  do. The ones sending dirty signals are generally those that are not
>  doing this. They go out and buy things expecting they will work and
>  not realising that they should not over drive amplifiers etc. Anyway,
>  it doesn't really matter what we think about these rules as AMSAT-DL
>  and the Sponsors have set rules for us to abide by, one of which is
>  "Full duplex operation is mandatory (you must be able to monitor your
>  own downlink while transmitting!)"

https://amsat-dl.org/en/p4-a-nb-transponder-bandplan-and-operating-guidelines/
>  --
>  Mike G0MJW





Re: Earth stakes

Don Hawbaker
 

It will sometimes help if you drive the rod at an angle.


On Sep 7, 2020 at 3:41 AM, <alwyn.seeds1> wrote:

Dear Robin,

Yes, indeed. 

I’m sure there are better methods, but in the Cotswolds, I resorted to a 1m long drill drill to put a hole through any stones in the compacted farmed layer. It was then possible to drive rods through the holes, presumably splitting the stones on the way. Once through this layer, it was possible to continue driving the rest of the 1.5m rod in. After a season the soil movement locks the rod in immoveably. Ground resistance per rod was around 80 ohms, so a lot of rods were needed to provide an acceptable lightning ground.

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: G0MRF downconverter

John E. Beech
 

Does using Goonhilly SDR count?

de John G8SEQ

-------Original Message-------
From: Mike Willis <willis.mj@gmail.com>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] G0MRF downconverter
Sent: Sep 06 '20 13:11

But Andy,

Its the rule. We might not like the rules but we have to follow them.
One of these is you need to be able to monitor your downlink while
transmitting. It's doesn't say listen, looking at a waterfall ought to
do. The ones sending dirty signals are generally those that are not
doing this. They go out and buy things expecting they will work and
not realising that they should not over drive amplifiers etc. Anyway,
it doesn't really matter what we think about these rules as AMSAT-DL
and the Sponsors have set rules for us to abide by, one of which is
"Full duplex operation is mandatory (you must be able to monitor your
own downlink while transmitting!)"

https://amsat-dl.org/en/p4-a-nb-transponder-bandplan-and-operating-guidelines/
--
Mike G0MJW


Re: Farnham and Mow Cop SDRs

Neil Smith G4DBN
 

I tried Mow Cop last night and I was very weak on it. I couldn’t hear much here, just RS from PKT, LEX and OSW, and Mow Cop wasn’t seeing OSW.
https://tropo.f5len.org/forecasts-for-europe/ shows a bit of enhancement overnight sinking away southwards, but the Midlands are blanketed in absorbent drizzle.
Neil G4DBN


On 7 Sep 2020, at 07:34, Adrian G4UVZ via groups.io <adrianwhatmore248@...> wrote:

Can anyone confirm that these are currently working?

I thought this misty September morning looked as if there might be a bit of dx about on 3cms..however no sign of any signals on either SDR.

Normally at least GB3SEE is present on Farnham.


Re: Re slow turnaround?

Andy
 

I would bet a significant amount of cash on the problem being with aol.com.  A simple fix would be to use a reputable email provider with a decent quality of service unlike the sub-optimal service provided aol.   I base this on years of running webservers that email users with things like password reminders etc. If the user has Yahoo, aol as their email provider then I know there will be problems. (There's a stack of US providers who are just as bad, Comcast for one.)

Andy



From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of militaryoperator via groups.io <Military1944@...>
Sent: Saturday, September 5, 2020 7:45 AM
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] Re slow turnaround?
 
odd. 

sent at 14:36, received at 15:35

Ben


-----Original Message-----
From: militaryoperator via groups.io <Military1944@...>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Sent: Sat, 5 Sep 2020 14:42
Subject: [UKMicrowaves] on 10g now

anyone on 10GHz now?

Ben G4BXD IO82UJ


Re: Earth stakes

alwyn.seeds1
 

Dear Robin,

Yes, indeed. 

I’m sure there are better methods, but in the Cotswolds, I resorted to a 1m long drill drill to put a hole through any stones in the compacted farmed layer. It was then possible to drive rods through the holes, presumably splitting the stones on the way. Once through this layer, it was possible to continue driving the rest of the 1.5m rod in. After a season the soil movement locks the rod in immoveably. Ground resistance per rod was around 80 ohms, so a lot of rods were needed to provide an acceptable lightning ground.

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.
_____________________________________________________


Farnham and Mow Cop SDRs

Adrian G4UVZ
 

Can anyone confirm that these are currently working?

I thought this misty September morning looked as if there might be a bit of dx about on 3cms..however no sign of any signals on either SDR.

Normally at least GB3SEE is present on Farnham.


Re: Earth stakes

Paul Randall G3NJV
 

Using mains pressure water down a copper tube with handles so it can be twisted about comes to mind. Stones are a problem.
Julian, unless you live on a salt bog or wet clay, try Plan B.
I echo Robins points and add the following.
An HF vertical will almost always do better with radials instead of earth rods, unless you are on a bog or beach. Those who have worked hard to get an efficient vertical often end up with 32, 64 or even more radials. On topband, and I imagine even lower, do anything to avoid relying on ground rods.
With no alternative, use whatever works in your location, but put in as many as you can manage and water them, I recall suggestions to use chemical additive - what??????
I use a vertical loop on top band, the trees I thought an obstacle ended up supporting the loop - hell yes my 100W heats them up, but enough escapes to make it a fantastic antenna, transatlantic most days FT8, no ground needed.
Cheers,

 


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Robin Szemeti - G1YFG <robin@...>
Sent: 06 September 2020 19:09
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Earth stakes
 
You could just save the copper and effort and not bother?

Try measuring the actual impedance of an "earth stake" and it is frequently in the hundreds or even thousands of ohms in stony ground. At best, they help discharge a little static.   On 160m, I radiate a decent signal, and my ground system is bits of wire, fences and associate bits of metalwork that I have been able to press into service. The feed point impedance is quite low, I doubt an "earth stake" would have any benefit at all.


On Sun, 6 Sep 2020 at 18:40, Reg Woolley via groups.io <g8vhi=btinternet.com@groups.io> wrote:
Hilti drills have an attachment that hammmer earth spikes in. Maybe worth trying your local hire shop. They go in real easy that way. 

Reg g8vhi 



Sent from Samsung tablet.


-------- Original message --------
From: Martin Phillips G4CIO <martin@...>
Date: 06/09/2020 18:10 (GMT+00:00)
Subject: Re: [UKMicrowaves] Earth stakes

A very large SDS drill. They sometimes have them at bargain prices in Aldi. I've got a 1 m x 25 mm one.

On 6/9/20 6:04 PM, g4zod@... via groups.io wrote:
Not quite microwaves, but still radio.
I have been trying to drive in earth stakes for my shack and  HF vertical.
I have tried using a sharped rod and a club hammer to start the hole ,but I am not really succeeding. (I also pour water into the hole to soften things up whilst driving the rod.)
I use 25 mm copper tubes and 10 mm copper coated rods.
Any advice on the best way to get about a Metre into stoney soil?
( The Dragon will not be happy if I dig out large holes on "her garden".
Many thanks.
G4ZOD
Sent from BlueMail



--
Robin Szemeti - G1YFG


Re: G0MRF downconverter

Colin Ranson
 

Hi Paul,

 

I really fail to see where you are coming from. I never suggested for one moment that the IC-706MK2G could transmit and receive at the same time.  All I want is full transceive, marrying up the uplink IF and the downlink IF as being on the same frequency on the radio, obviously the RIT will almost certainly have to be used to some extent.

The signal strength into the transponder can be monitored on the WEB SDR from Goonhilly..... or if that goes down I have a second  dish with stable LNB I can feed into a dongle at 739MHz.   

Just out of interest on the uplink I use an SG Labs transverter into an SG Labs 20w amp throttled back to 15w. Uplink antenna is a so called ‘professional Super Cannon’ - a 16 turn helix made for the drone market with my modification of an arrow shaped tab inserted at the first quarter turn for the amp to ‘see’ a proper 50ohm.  

The amplifier and 25MHz reference sit on the windowsill the other side of the shack with the helix on the other side of the wall.  As soon as I hopefully get some success with a new 25.788461++++ MHz reference using the Si clock chip I will let everyone know. I am not one hell of a know-all, far from it, I will have to get my good friend Martin Waller to program the ‘NANO’ or even a ‘MICRO’....that’s beyond my 70 year old brain these days.

 

I’ve just thought, if I do that I will need a bias tee ! 12v for the LNB presently derived from the MRF downconverter.

 

Best regards to all,

 

Colin de G8LBS, Ipswich.

 

 

Sent from Mail for Windows 10 Pro

 

From: Paul Randall G3NJV
Sent: 06 September 2020 21:57
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] G0MRF downconverter

 

The IC706 cannot transmit and receive at the same time. You need an IC-821 or IC-910 or another "satellite" rig for that. "Full duplex mandatory" is not about having a full duplex communication circuit, it is specified because you are accessing a linear transponder and MUST monitor your uplink in real time to ensure you are not too "hot". You can check your uplink using the web SDR at Goonhilly and use a traditional half duplex "press to talk" rig for your communication circuit - easy.

 

Satellite DID virtually replace undersea cables on thick routes - e.g. carriers put up to increase capacity at Christmas to USA/Canada/Australia had thousands of telephone circuits - an order of magnitude increase over coaxial cables. Then fibre happened.

 

Hearing noises coming back at you while you are talking makes people hesitate and pause their speech, it is after all, POLITE to do so; upbringing, social skill, we learn to do this to participate in normal conversations. A common problem on HF marine circuits that pre-dated satellite, so possibly not so much an issue of delay.  I have recordings of conversations on HF completely halted by "politeness" even though the "communication speech circuits" are fully operational - sometimes the "operator" had to break in to get things moving again. Mastering this issue was, and still is today, a MUST for professionals, Coastguard, Air traffic control, etc - it is largely a case of becoming a bit boorish and completing your sentence no matter what you hear - ears off mouth on. Yes, you might have full duplex, but to communicate effectively you may (mentally) need to use it like half duplex.

Thats my 2p worth

Cheers Paul

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of PAUL NICKALLS via groups.io <paulnick@...>
Sent: 06 September 2020 19:47
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] G0MRF downconverter

 

The delay is why the telephone system will not use 2 satellite links on a telephony circuit.  It was thought that satellites would replace undersea cables. However ......

Paul G8AQA

On 06/09/2020 15:39, Andy G4JNT wrote:

Good ooint Colin, forgotton that as I don't use SSB on the satellite.   John, haedphones doesn't solve this impossibility many have of being able to talk properly when your own voice is delayed by even a 100ms.    I got really badly tied up on a Zoom meet recently when one participant was relaying the received audio, so everyone  else got their voice back a few 100ms after it was spoken.

 

Only ever used voice on QO100 a handful of times when it first started and it was impossible to even say one word without stuttering when my own voice came back after a delay.   So I had to turn the volume down on Tx anyway, in the absence of a mute facility.

 

Which makes a complete mockery of the "mandatory full duplex" guideline

 

Andy

 

 

 

On Sun, 6 Sep 2020 at 15:20, John Fell <john.g0api@...> wrote:

Headphones ?

 

John

G0API

 

On Sun, 6 Sep 2020 at 14:48, Colin Ranson <g8lbs@...> wrote:

Andy, I find listening to my downlink audio makes me stutter, I just look at my waterfall.  I turn off the extension speaker on the FT460 with a relay coupled to the IC-706 PTT.

 

Cup of tea time.

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Andy G4JNT
Sent: 06 September 2020 12:48
To: UK Microwaves groups.io
Subject: Re: [UKMicrowaves] G0MRF downconverter

 

Just a comment

"Full Duplex, mandatory"

Whaaaaatttt ?

Who listens to their downlink - it generates howl-round if nothing else.

 

All you have to be able to do is listen on your Rx frequency.   And on satellites, that means your downlink - it doesn't have to be simultaneous.

 

Andy

 

 

 

On Sun, 6 Sep 2020 at 12:34, Mike Willis <willis.mj@...> wrote:

Can the IC706 dull full duplex? Not sure it can so you can't really use it with QO100 without something to provide the duplex, which is after all, a mandatory requirement. As you then need two radios anyway so it's probably better their IFs are in different bands. An SDR receiver is the simple choice and it doesn't need a downconverter, but something that does satellite modes, like a TS2000 or FT726/736 would be good.
--
Mike G0MJW

 

 

 


Re: G0MRF downconverter

Paul Randall G3NJV
 

The IC706 cannot transmit and receive at the same time. You need an IC-821 or IC-910 or another "satellite" rig for that. "Full duplex mandatory" is not about having a full duplex communication circuit, it is specified because you are accessing a linear transponder and MUST monitor your uplink in real time to ensure you are not too "hot". You can check your uplink using the web SDR at Goonhilly and use a traditional half duplex "press to talk" rig for your communication circuit - easy.
 
Satellite DID virtually replace undersea cables on thick routes - e.g. carriers put up to increase capacity at Christmas to USA/Canada/Australia had thousands of telephone circuits - an order of magnitude increase over coaxial cables. Then fibre happened.

Hearing noises coming back at you while you are talking makes people hesitate and pause their speech, it is after all, POLITE to do so; upbringing, social skill, we learn to do this to participate in normal conversations. A common problem on HF marine circuits that pre-dated satellite, so possibly not so much an issue of delay.  I have recordings of conversations on HF completely halted by "politeness" even though the "communication speech circuits" are fully operational - sometimes the "operator" had to break in to get things moving again. Mastering this issue was, and still is today, a MUST for professionals, Coastguard, Air traffic control, etc - it is largely a case of becoming a bit boorish and completing your sentence no matter what you hear - ears off mouth on. Yes, you might have full duplex, but to communicate effectively you may (mentally) need to use it like half duplex.
Thats my 2p worth
Cheers Paul


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of PAUL NICKALLS via groups.io <paulnick@...>
Sent: 06 September 2020 19:47
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] G0MRF downconverter
 
The delay is why the telephone system will not use 2 satellite links on a telephony circuit.  It was thought that satellites would replace undersea cables. However ......

Paul G8AQA

On 06/09/2020 15:39, Andy G4JNT wrote:
Good ooint Colin, forgotton that as I don't use SSB on the satellite.   John, haedphones doesn't solve this impossibility many have of being able to talk properly when your own voice is delayed by even a 100ms.    I got really badly tied up on a Zoom meet recently when one participant was relaying the received audio, so everyone  else got their voice back a few 100ms after it was spoken.

Only ever used voice on QO100 a handful of times when it first started and it was impossible to even say one word without stuttering when my own voice came back after a delay.   So I had to turn the volume down on Tx anyway, in the absence of a mute facility.

Which makes a complete mockery of the "mandatory full duplex" guideline



On Sun, 6 Sep 2020 at 15:20, John Fell <john.g0api@...> wrote:
Headphones ?

John
G0API

On Sun, 6 Sep 2020 at 14:48, Colin Ranson <g8lbs@...> wrote:

Andy, I find listening to my downlink audio makes me stutter, I just look at my waterfall.  I turn off the extension speaker on the FT460 with a relay coupled to the IC-706 PTT.

 

Cup of tea time.

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Andy G4JNT
Sent: 06 September 2020 12:48
To: UK Microwaves groups.io
Subject: Re: [UKMicrowaves] G0MRF downconverter

 

Just a comment

"Full Duplex, mandatory"

Whaaaaatttt ?

Who listens to their downlink - it generates howl-round if nothing else.

 

All you have to be able to do is listen on your Rx frequency.   And on satellites, that means your downlink - it doesn't have to be simultaneous.

 

Andy

 

 

 

On Sun, 6 Sep 2020 at 12:34, Mike Willis <willis.mj@...> wrote:

Can the IC706 dull full duplex? Not sure it can so you can't really use it with QO100 without something to provide the duplex, which is after all, a mandatory requirement. As you then need two radios anyway so it's probably better their IFs are in different bands. An SDR receiver is the simple choice and it doesn't need a downconverter, but something that does satellite modes, like a TS2000 or FT726/736 would be good.
--
Mike G0MJW

 



mm-wave Contest Sunday 13th September - Activity List

John Quarmby
 

The main mm-wave contest of the year takes place next Sunday 13th November, from 0900-1700 UTC (1000 - 1800BST).

This covers all bands from 24GHz to 248GHz. Full rules are here:

https://www.microwavers.org/files/2020-mwrules_v6.pdf

8 character locators must be used, rover operation is permitted.

Please advise your operating plans and I will send out a list on Saturday. The usual format please:

Callsign: G3XDY
Locator: JO02OB
Bands: 24GHz 2.5W 48cm dish
Talkback: ON4KST, Zello, 144.390MHz
Times: Various throughout

73

John G3XDY


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Re: G0MRF downconverter

Paul G8AQA
 

The delay is why the telephone system will not use 2 satellite links on a telephony circuit.  It was thought that satellites would replace undersea cables. However ......

Paul G8AQA

On 06/09/2020 15:39, Andy G4JNT wrote:
Good ooint Colin, forgotton that as I don't use SSB on the satellite.   John, haedphones doesn't solve this impossibility many have of being able to talk properly when your own voice is delayed by even a 100ms.    I got really badly tied up on a Zoom meet recently when one participant was relaying the received audio, so everyone  else got their voice back a few 100ms after it was spoken.

Only ever used voice on QO100 a handful of times when it first started and it was impossible to even say one word without stuttering when my own voice came back after a delay.   So I had to turn the volume down on Tx anyway, in the absence of a mute facility.

Which makes a complete mockery of the "mandatory full duplex" guideline



On Sun, 6 Sep 2020 at 15:20, John Fell <john.g0api@...> wrote:
Headphones ?

John
G0API

On Sun, 6 Sep 2020 at 14:48, Colin Ranson <g8lbs@...> wrote:

Andy, I find listening to my downlink audio makes me stutter, I just look at my waterfall.  I turn off the extension speaker on the FT460 with a relay coupled to the IC-706 PTT.

 

Cup of tea time.

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Andy G4JNT
Sent: 06 September 2020 12:48
To: UK Microwaves groups.io
Subject: Re: [UKMicrowaves] G0MRF downconverter

 

Just a comment

"Full Duplex, mandatory"

Whaaaaatttt ?

Who listens to their downlink - it generates howl-round if nothing else.

 

All you have to be able to do is listen on your Rx frequency.   And on satellites, that means your downlink - it doesn't have to be simultaneous.

 

Andy

 

 

 

On Sun, 6 Sep 2020 at 12:34, Mike Willis <willis.mj@...> wrote:

Can the IC706 dull full duplex? Not sure it can so you can't really use it with QO100 without something to provide the duplex, which is after all, a mandatory requirement. As you then need two radios anyway so it's probably better their IFs are in different bands. An SDR receiver is the simple choice and it doesn't need a downconverter, but something that does satellite modes, like a TS2000 or FT726/736 would be good.
--
Mike G0MJW

 



Re: Earth stakes

Robin Szemeti - G1YFG
 

You could just save the copper and effort and not bother?

Try measuring the actual impedance of an "earth stake" and it is frequently in the hundreds or even thousands of ohms in stony ground. At best, they help discharge a little static.   On 160m, I radiate a decent signal, and my ground system is bits of wire, fences and associate bits of metalwork that I have been able to press into service. The feed point impedance is quite low, I doubt an "earth stake" would have any benefit at all.


On Sun, 6 Sep 2020 at 18:40, Reg Woolley via groups.io <g8vhi=btinternet.com@groups.io> wrote:
Hilti drills have an attachment that hammmer earth spikes in. Maybe worth trying your local hire shop. They go in real easy that way. 

Reg g8vhi 



Sent from Samsung tablet.


-------- Original message --------
From: Martin Phillips G4CIO <martin@...>
Date: 06/09/2020 18:10 (GMT+00:00)
Subject: Re: [UKMicrowaves] Earth stakes

A very large SDS drill. They sometimes have them at bargain prices in Aldi. I've got a 1 m x 25 mm one.

On 6/9/20 6:04 PM, g4zod@... via groups.io wrote:
Not quite microwaves, but still radio.
I have been trying to drive in earth stakes for my shack and  HF vertical.
I have tried using a sharped rod and a club hammer to start the hole ,but I am not really succeeding. (I also pour water into the hole to soften things up whilst driving the rod.)
I use 25 mm copper tubes and 10 mm copper coated rods.
Any advice on the best way to get about a Metre into stoney soil?
( The Dragon will not be happy if I dig out large holes on "her garden".
Many thanks.
G4ZOD
Sent from BlueMail



--
Robin Szemeti - G1YFG


Re: G0MRF downconverter

Wilko
 

Amen to that. It drives me nuts listening to the downlink while speaking.

I also really do not see the point why one should, if you want to monitor the downlink there a eminently functional waterfall displays available to do just that.

Wilko
PA1WBU


Re: GB3PKT

Neil Smith G4DBN
 

That's be a "yes" then...

Neil G4DBN

On 06/09/2020 18:45, Neil Smith G4DBN wrote:
Yes, seeing the usual 20 seconds transmission every ten mins at hh:m7:40 or so. Waiting to see if it comes on again at 17:47:40

Neil G4DBN

On 06/09/2020 18:38, Nicholas Shaxted wrote:
Sorry about the typo on the cluster

Yes it has been in "10MHz mode" today. It was fine yesterday morning. So the group must have activated the 10MHz (or other) beacons.

It does parp every so often on 10368.945 but mainly a noise carrier on about 961/962

Nick - g4ogi

-----Original Message-----
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Neil Smith G4DBN via groups.io
Sent: 06 September 2020 18:26
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] GB3PKT

I just saw a brief burst of transmission from GB3PKT on the nominal frequency, but it stopped and I think I see it near 10368.961 and it is a bit wobbly. It was a bit lower ten minutes ago.

Ah, spot from Nick G4OGI confirms my suspicions!  Thanks Nick.

Neil G4DBN







-- 
Neil
http://g4dbn.uk


Re: GB3PKT

Neil Smith G4DBN
 

Yes, seeing the usual 20 seconds transmission every ten mins at hh:m7:40 or so. Waiting to see if it comes on again at 17:47:40

Neil G4DBN

On 06/09/2020 18:38, Nicholas Shaxted wrote:
Sorry about the typo on the cluster

Yes it has been in "10MHz mode" today. It was fine yesterday morning. So the group must have activated the 10MHz (or other) beacons.

It does parp every so often on 10368.945 but mainly a noise carrier on about 961/962

Nick - g4ogi

-----Original Message-----
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Neil Smith G4DBN via groups.io
Sent: 06 September 2020 18:26
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] GB3PKT

I just saw a brief burst of transmission from GB3PKT on the nominal frequency, but it stopped and I think I see it near 10368.961 and it is a bit wobbly. It was a bit lower ten minutes ago.

Ah, spot from Nick G4OGI confirms my suspicions!  Thanks Nick.

Neil G4DBN

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