Date   

Re: Pneumatic masts

Gary M1EGI
 

I have three clarke mast's...
two are portable/vehicle mount and work great, as mentions ONLY use silcone as lubricant I find the spray/liquid better but they do say use grease.

the only mast I bought (SCAM12) for my new QTH to set up a home microwave station fails to pump up, this was bought as a working item!
the air seems to be leaking from the 3rd section so I need to sort that before I can mount it on the workshop.

Clarke are very good at responding to e-mails and have even sent me service docs for the SCAM (digital format)
at this moment in time I find there prices a little hard to swallow (Yorkshire man HI)

As mentioned before in breezy and or with heavier payloads they do need guying.

73's Gary (M1EGI)


Fw: Beacon 20W

Ralph
 

Good morning,
 
Following received from Spain this morning
about the EA2TZ/B on 23cm in IN93BF 1296.8550.
Please spot this beacon when heard as it will be much
appreciated having been only operational for a short
time it has gone from 2W to 5W and now 20W.
73
Ralph G4ALY
Unable to receive anything here yet -"Radar type" interference
probably from the Grey funnel line.

----- Original Message -----
Sent: Wednesday, October 02, 2013 9:50 AM
Subject: Beacon 20W

Hello.
Today Wednesday Day 2 I will put another amplifier to the beacon, this is 20W.
Now only improve the system would remain readiante to other areas, keeping this now.
 
A greeting
 
Josemi
EA2TZ

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3408 / Virus Database: 3222/6716 - Release Date: 10/02/13


Re: Pneumatic masts

Mike
 

Hi Mike.


There to manky Mike's answering this post.


I found Clarke's very helpful as I managed to pick up an old ST1 a few years ago and I needed some brackets for wall mounting. Which still has not been done-ah life.

But I agree with Mike G0MJW, about the seals and you need to keep a pot of silicon grease handy to grease the pistons.

The Royal Observer Corp used them on their Master Posts and that was their main problem was sticking sections.


Regards,


Mike G4WYZ



---In ukmicrowaves@..., <g3lyp@...> wrote:


Thanks for that Mike. Yes, I am only intending to use it for small microwave antennas. At the moment If I want to add a new antenna it means getting out ladders and climbing on the roof, and I am getting too old for that!!
 
If I can add or remove an antenna easily, I might even get on the air!
 
73, Mike, G3LYP

----- Original Message -----
Sent: Wednesday, October 02, 2013 9:00 AM
Subject: [ukmicrowaves] RE: Pneumatic masts

 

We had a 20m mast on a landrover and used it for many years. The issues are the seals eventually fail and need replacing. However, perhaps more of a problem is the lack of rigidity. You do need to guy it and it limits the antennas - don't try and fit a 40m yagi on it or a large dish. A small dish, e.g. 1.2m mesh should be OK though. The big advantage is you can usually turn the entire mast easily by hand no rotator to worry about and when fully down the antennas are at a very manageable height.


Mike G0MJW



---In ukmicrowaves@..., <ukmicrowaves@...> wrote:

Hi All
 
have decided to buy a pneumatic mast and had a look at the products from Clark and Total Mast Solutions at Newark last Friday. On balance, the Clark ones look to be slightly more sturdy, but wonder if anyone has experience of dealing with either company, and can make any recommendations.
 
Probably best to do it to me direct.
 
Many thanks in advance.
 
Mike, G3LYP


Re: IO91RF in Low Microwave Bands 6-Oct

David.Austen@...
 

To confirm our details:

 

G1EHF, G4SJH, G3TCT, G3TCU, G3WBQ will be active as G1EHF/P from IO91RF on Sunday with:

 

23 cm = 250W to 4 x 35 element @ 9 m

13 cm = 60W to 90 cm dish @ 5 m

9 cm = 10W to 70 cm dish @ 7 m

 

We will also have 144MHz talk-back and ON4KST (separate sign-ons for 23 cm and 13 + 9 cm)

 

Hope to work you all!

 

Dave, G1EHF



---In ukmicrowaves@..., <ukmicrowaves@...> wrote:

The group of us who often activate IO91RF in the Low Microwave Bands sessions will be on next Sunday.
(G1EHF, G4SJH, G3TCT, G3TCU, G3WBQ) we'll post the details asap.
We couldn't make the June session as we nearly all had other commitments.

There will have to be lots of good Dx QSOs to justify the early start!

73, Phil.

 

On 28/09/2013 14:29, Ralph Bird wrote:
 
If I get shot down, I will deploy a parachute!.
 
Seriously:
I am increasingly more and more alarmed at
the numbers who indicate that they are to be
active for the contests.
 
Investment apart, the time I put to these events
is increasingly becoming counter productive.
 
I know there are a few who choose not to indicate
their intentions via this reflector, but one cannot
deny that numbers are dropping off.
 
I am active every day. sickness and Christmas day
being the only exceptions.  I know that is my choice but
'Surely',  when you see the numbers active on the
reflector,  some of you could boost the
activity,  even if its only for an hour or two.
 
Like it or not, I still say that if I did not have that
window into France. This station would have been
sold off after 50 years being an active radio amateur,
starting as VQ8BY in 1963 while in Mauritius with the R.N.
to buy a Leica M9 and get a life.
 
Please, please switch on your gear, maybe you may
even enjoy it. Also answer the often debated topic on here
of   "Activity on the bands"., simple!.
 
73 Ralph
G4ALY
 


Re: Pneumatic masts

Michael Scott
 


Thanks for that Mike. Yes, I am only intending to use it for small microwave antennas. At the moment If I want to add a new antenna it means getting out ladders and climbing on the roof, and I am getting too old for that!!
 
If I can add or remove an antenna easily, I might even get on the air!
 
73, Mike, G3LYP

----- Original Message -----
Sent: Wednesday, October 02, 2013 9:00 AM
Subject: [ukmicrowaves] RE: Pneumatic masts

 

We had a 20m mast on a landrover and used it for many years. The issues are the seals eventually fail and need replacing. However, perhaps more of a problem is the lack of rigidity. You do need to guy it and it limits the antennas - don't try and fit a 40m yagi on it or a large dish. A small dish, e.g. 1.2m mesh should be OK though. The big advantage is you can usually turn the entire mast easily by hand no rotator to worry about and when fully down the antennas are at a very manageable height.


Mike G0MJW



---In ukmicrowaves@..., wrote:

Hi All
 
have decided to buy a pneumatic mast and had a look at the products from Clark and Total Mast Solutions at Newark last Friday. On balance, the Clark ones look to be slightly more sturdy, but wonder if anyone has experience of dealing with either company, and can make any recommendations.
 
Probably best to do it to me direct.
 
Many thanks in advance.
 
Mike, G3LYP


Re: Pneumatic masts

Mike Willis
 

We had a 20m mast on a landrover and used it for many years. The issues are the seals eventually fail and need replacing. However, perhaps more of a problem is the lack of rigidity. You do need to guy it and it limits the antennas - don't try and fit a 40m yagi on it or a large dish. A small dish, e.g. 1.2m mesh should be OK though. The big advantage is you can usually turn the entire mast easily by hand no rotator to worry about and when fully down the antennas are at a very manageable height.


Mike G0MJW



---In ukmicrowaves@..., <ukmicrowaves@...> wrote:

Hi All
 
have decided to buy a pneumatic mast and had a look at the products from Clark and Total Mast Solutions at Newark last Friday. On balance, the Clark ones look to be slightly more sturdy, but wonder if anyone has experience of dealing with either company, and can make any recommendations.
 
Probably best to do it to me direct.
 
Many thanks in advance.
 
Mike, G3LYP


Re: Power rating of SMA relays

Graham Kimbell G3TCT <g3tct@...>
 

Hi Tim

I found this in relation to Narda SEM SMA relays, I imagine the ms-sma relay to be similar. I've run about 40W at 23cm through mine - haven't destroyed them yet!

http://www.nardamicrowave.com/east/pdfs/standardCustomEMSwitches/PowerHandlingCapability.pdf

73
Graham


Re: Power rating of SMA relays

Grant Hodgson <grant@...>
 

Tim

Not sure about the Narda, but the datasheet for the Radiall is easy to find, this link should work :-

https://radiall-files.s3.amazonaws.com/tds/ramses/R570313000.pdf

- it says 240W average power.

regards

Grant G8UBN

Quoting tim.forrester@gmail.com:



I have an assortment of SMA relays made by Radiall and Narda

The Radiall units are rated 0-3GHz and part number R570313000 and the
Narda's are MS-SMA-020 FSCM99899

No matter how much I search I cannot seem to find out what their power
handling ratings are.

Any ideas ?

73 Tim G4WIM KT6UK


Links:
------
[1] mailto:tim.forrester@gmail.com?subject=Re%3A%20Power%20rating%20of%20SMA%20relays
[2] mailto:ukmicrowaves@yahoogroups.com?subject=Re%3A%20Power%20rating%20of%20SMA%20relays
[3] http://groups.yahoo.com/group/ukmicrowaves/post;_ylc=X3oDMTJlcjA5NGx1BF9TAzk3MzU5NzE0BGdycElkAzgwOTAxMjEEZ3Jwc3BJZAMxNzA1MDYzMTA4BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTM4MDU3NDIxNw--
[4] http://groups.yahoo.com/group/ukmicrowaves/message/33648;_ylc=X3oDMTM2ZmgzYmV2BF9TAzk3MzU5NzE0BGdycElkAzgwOTAxMjEEZ3Jwc3BJZAMxNzA1MDYzMTA4BG1zZ0lkAzMzNjQ4BHNlYwNmdHIEc2xrA3Z0cGMEc3RpbWUDMTM4MDU3NDIxNwR0cGNJZAMzMzY0OA--
[5] http://groups.yahoo.com/group/ukmicrowaves;_ylc=X3oDMTJldjc4dTNsBF9TAzk3MzU5NzE0BGdycElkAzgwOTAxMjEEZ3Jwc3BJZAMxNzA1MDYzMTA4BHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTM4MDU3NDIxNw--
[6] http://groups.yahoo.com/;_ylc=X3oDMTJkOTZmZTNuBF9TAzk3NDc2NTkwBGdycElkAzgwOTAxMjEEZ3Jwc3BJZAMxNzA1MDYzMTA4BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxMzgwNTc0MjE3
[7] mailto:ukmicrowaves-traditional@yahoogroups.com?subject=Change Delivery Format: Traditional
[8] mailto:ukmicrowaves-digest@yahoogroups.com?subject=Email Delivery: Digest
[9] mailto:ukmicrowaves-unsubscribe@yahoogroups.com?subject=Unsubscribe
[10] http://info.yahoo.com/legal/us/yahoo/utos/terms/
[11] mailto:ygroupsnotifications@yahoogroups.com?subject=Feedback on the redesigned individual mail v1


Re: Power rating of SMA relays

Roger Blackwell GM4PMK
 

On 30/09/2013 21:50, tim.forrester@... wrote:

I have an assortment of SMA relays made by Radiall and Narda


The Radiall units are rated 0-3GHz and part number R570313000 and the Narda's are MS-SMA-020 FSCM99899

A old Radiall catalogue I have, although it doesn't have the R570 ... series in it, does however  give a general power handling guide for their SMA relays as follows:
0.2GHz 100 W; 1 GHz 70 W; 10GHz 30W; 20 W 18GHz.

73
--

Roger Blackwell  GM4PMK

www.marsport.org.uk


Pneumatic masts

Michael Scott
 

Hi All
 
have decided to buy a pneumatic mast and had a look at the products from Clark and Total Mast Solutions at Newark last Friday. On balance, the Clark ones look to be slightly more sturdy, but wonder if anyone has experience of dealing with either company, and can make any recommendations.
 
Probably best to do it to me direct.
 
Many thanks in advance.
 
Mike, G3LYP


NEC NE72089 or NE72084

John Quarmby
 

I have had a request from a friend looking for a couple of NEC NE72089 or NE72084 to repair a piece of test gear. Anyone got one or two in their junk box that you might part with for a reasonable sum please?

73

John G3XDY


Re: Wanted: Male N chassis mount plug - preferably silver plated.

Dr. David Kirkby <drkirkby@...>
 

Yes thank you, someone donated me one!

Dave

On 30 September 2013 21:47, Grant Hodgson <grant@ghengineering.co.uk> wrote:
Dave

Did you get one?

regards
Grant G8UBN

On 23/09/2013 10:23, David Kirkby wrote:
Does anyone know of where I can get a *male* N plug that is chassis
mount. Something like this

http://uk.farnell.com/amphenol-connex/172118/rf-coaxial-n-plug-str-50-ohm-solder/dp/1791344

from Farnell, but I am not keen to pay £16 delivery charge as it is
only stocked in the USA and not the UK. I'm only looking for one.
Preferably one that is silver plated, so I can solder as close to the
centre as possible.

I want to make a test jig, to measure the DC resistance of some male
and female terminations using a DVM with 4-wire resistance
measurement.

Dave


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

Yahoo! Groups Links



Réf. : 24GHz White Box modules

F1CHF
 

Yes 600/800 Mhz
see this F6DRO's article (page 4)
in french ... sorry
 
francois F1CHF
 
 
 
 
 
-------Message original-------
 
Date : 30/09/2013 20:51:13
Sujet : [ukmicrowaves] 24GHz White Box modules
 
 

Seem to have had a mental block...
 
I've done a fair bit  with these Alcatel units in the past, but can't remember what the original IF frequency range was.
Using them on 1296 or 432 is not optimum, and I'm guessing they were centred around 800MHz.- 900MHz
 
Does anyone know the correct IF ?
 
Had a brainwave of a good way to use these - will publish if it works out.
 
Andy
G4JNT
 

 


Power rating of SMA relays

G4WIM KT6UK
 

I have an assortment of SMA relays made by Radiall and Narda


The Radiall units are rated 0-3GHz and part number R570313000 and the Narda's are MS-SMA-020 FSCM99899

No matter how much I search I cannot seem to find out what their power handling ratings are.

Any ideas ?

73 Tim  G4WIM KT6UK


Re: Wanted: Male N chassis mount plug - preferably silver plated.

Grant Hodgson <grant@...>
 

Dave

Did you get one?

regards
Grant G8UBN

On 23/09/2013 10:23, David Kirkby wrote:
Does anyone know of where I can get a *male* N plug that is chassis
mount. Something like this

http://uk.farnell.com/amphenol-connex/172118/rf-coaxial-n-plug-str-50-ohm-solder/dp/1791344

from Farnell, but I am not keen to pay 16 delivery charge as it is
only stocked in the USA and not the UK. I'm only looking for one.
Preferably one that is silver plated, so I can solder as close to the
centre as possible.

I want to make a test jig, to measure the DC resistance of some male
and female terminations using a DVM with 4-wire resistance
measurement.

Dave


24GHz White Box modules

Andy G4JNT
 

Seem to have had a mental block...
 
I've done a fair bit  with these Alcatel units in the past, but can't remember what the original IF frequency range was.
Using them on 1296 or 432 is not optimum, and I'm guessing they were centred around 800MHz.- 900MHz
 
Does anyone know the correct IF ?
 
Had a brainwave of a good way to use these - will publish if it works out.
 
Andy
G4JNT
 


Re: IF Interface to FT-817 - having linearity problems

Richard Ferryman
 

Quick update Sam.  Lifted the transmit path input diode and replaced with 1nF cap.  Now have perfect drive and RX still OK.

Dick G4BBH 



---In ukmicrowaves@..., <ukmicrowaves@...> wrote:

Folks,
This seems like an ideal time to comment on something I've mentioned previously.
When a circuit is published in a book it tends to reappear ad infinitum, in that form, even if there had been corrections in the meantime. There have been many examples in RSGB books over the years.
I am assuming the circuit Dick refers to is the interface to the 23cm transverter.
In that circuit the transmit path input diode can safely be removed and replaced by a 1nF capacitor. The diode bias resistor needs to be removed, of course, as it is no longer required.
The only downside is that some receive signal is shunted. The input switching can then handle a much bigger signal without distortion, otherwise the IF drive should be limited to a few tens of mW.


73 de Sam



Sent tomorrow from my time machine

g4ddk.com
g4ddk.blogspot.com


Re: IF Interface to FT-817 - having linearity problems

Christopher Bartram <cbartram@...>
 

Can I just put-in an entirely shameless plug for my SAT144P371 switchable power attenuator. This is designed to operate with the FT817 amongst a large number of other transceivers, and can be used - as indeed can all of my microwave system components - independently from other units in my range.

The SAT144 uses a combination of P-I-N diode and pHEMT switches, and has an internal adjustable power attenuator.

The SAT432P371 is available for people who want to use a 432MHz IF. 28 and 50MHz versions are also planned.

Further information is at <www.chris-bartram.co.uk>

Vy 73

Chris
GW4DGU


Re: Free PIN Switching Diodes

Michael Scott
 

Hi Andy et al
 
Just a reminder that the Chipbank has a number of PIN diodes including a recently received reel of BAR50-02V single diodes which have not yet been added to the catalogue but will be in the next update. They are good to 6GHz for switching.
 
73, Mike, G3LYP 

----- Original Message -----
Sent: Monday, September 30, 2013 10:07 AM
Subject: [ukmicrowaves] Free PIN Switching Diodes

 

(Well, for an SASE anyway)
 
A recent discussion on the UKMicrowaves Group recently reminded me I still have probably more than 500   DC2850E PIN switching diodes.   These were rescued from a skip (literally) after the cancellation of a large mil-comms order back in 1990 or thereabouts.   The PIN diodes were made by Marconi Electronic Devices (now there's a name from history) and each individual diode comes in its own sealed envelope.  
 
Designed for RF low to medium  power switching, these diodes have an on resistance of 0.8 ohms at 5mA forward current making them ideal for switching the output of HF through VHF (don't know about UHF) at moderate power  They are of ancient design, being glass encapsulated wire ended and are therefore a bit delicate, particularly when bending the wires close to the device body. 
They're rather large by modern standards;  the glass body is 4mm long, and allowing another 1mm on each wire for bend radius means PCB pads need to be at least 7 to 8mm apart.   
 
Over the years I've used them to switch the power steps in the 5MHz beacons GB3 RAL, WES and ORK, as other low level switches for various purposes, as an IF switch in several transverter interfaces from  HF through to  144MHz and as T/R switching for 10 - 20 Watts at 144MHz and 70MHz This latter application is probably close to their original design purpose. 
 
If you send me an SASE I will give free up to a maximum of 10 per individual.    Anyone wanting more that that, please explain why  - and to sell on Ebay is not a good excuse :-)    Postal address is QTHR and on QRZ.com - and has been for the last 25 years
 
They don't need a jiffy bag, a decent quality normal letter type envelope is OK.   Tiny lightweight things, already in a protective paper envelope.
And after reading the follow-up to Peter's recent offering, overseas customers, please follow the same procedures as Peter recommended. 
 
You may find a shortform data sheet on the web, but all it'll be is something like the one page I have and more-or-less summarised here:
  Vb(min) 35V 
  Vf(max) 1.0V
  Rs(max) 0.8 ohms at If 5mA, 40MHz
  Cd max  1.2pF at Vrr 20V
  Tr 5ns
 
There then follows a curve of slope resistance against forward current, with X,Y points   (mA, ohms) :
(0.01, 35)  (0.03, 18)  (0.1, 6.5)  (0.3, 2.5)  (1, 1.3)  (3,0.85)  (10, 0.7)  (30, 0.5)    You can join-up the dots !
 
I have no more data and think I've given enough information here to prevent the need for any email follow up and especially Group email clogging!
 
Andy
G4JNT
 
ps. 
If you feel generous, donations to the South Coast Beacon and Repeater group  http://www.scrbg.org/donate/   
The beacons are going though  a major mechanical overhaul with all wire guy and haul ropes being replaced - which all costs money
 


Re: IF Interface to FT-817 - having linearity problems

Richard Ferryman
 

Thanks for that tip Sam.  Will try a capacitor today.  Easier than having to etch and build yet another board.  On the receive path I can lose a little as my system gives optimum signal/noise wirh about 9dB attenuation between the mixer and FT-817.

Dick G4BBH



---In ukmicrowaves@..., <ukmicrowaves@...> wrote:

Folks,
This seems like an ideal time to comment on something I've mentioned previously.
When a circuit is published in a book it tends to reappear ad infinitum, in that form, even if there had been corrections in the meantime. There have been many examples in RSGB books over the years.
I am assuming the circuit Dick refers to is the interface to the 23cm transverter.
In that circuit the transmit path input diode can safely be removed and replaced by a 1nF capacitor. The diode bias resistor needs to be removed, of course, as it is no longer required.
The only downside is that some receive signal is shunted. The input switching can then handle a much bigger signal without distortion, otherwise the IF drive should be limited to a few tens of mW.


73 de Sam



Sent tomorrow from my time machine

g4ddk.com
g4ddk.blogspot.com