Date   

Re: HPF-505 Mixer

F1CHF
 

Andy
something like that ?
hi
regards
Francois
 

----- Original Message -----
Sent: Wednesday, March 31, 2010 4:59 PM
Subject: [ukmicrowaves] HPF-505 Mixer

 

I recently encountered the HPF-505 DB Mixer in an old SSB Electronics 432MHz transverter module circa 1983, then by fluke discovered I had some more of these; actually HPF-505X-1 devices that had been mis-stored into the misc filters drawer.  (Well, with a type number like HPF....  it was an obvious choice for an unknown).
 
Searching the web shows several hits, mostly amateur designs that use it instead of the better known SBL-1 / SRA-1 for which it shares near-enough the same base connections.  Some sites claim it is a MiniCircuits device  (and no, it isn't, or at least doesn't appear anywhere in their listings).  Now re-assigned to the drawer labelled "Odd Mixers"
 
Out of curiousity, does anyone have any actual details - like frequency range, or even who made the device.   
 



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HPF-505 Mixer

Andy Talbot <andy.g4jnt@...>
 

I recently encountered the HPF-505 DB Mixer in an old SSB Electronics 432MHz transverter module circa 1983, then by fluke discovered I had some more of these; actually HPF-505X-1 devices that had been mis-stored into the misc filters drawer.  (Well, with a type number like HPF....  it was an obvious choice for an unknown).
 
Searching the web shows several hits, mostly amateur designs that use it instead of the better known SBL-1 / SRA-1 for which it shares near-enough the same base connections.  Some sites claim it is a MiniCircuits device  (and no, it isn't, or at least doesn't appear anywhere in their listings).  Now re-assigned to the drawer labelled "Odd Mixers"
 
Out of curiousity, does anyone have any actual details - like frequency range, or even who made the device.   
 


Re: Help, how to calculate distance from Doppler frequency please

John E. Beech
 

Hi Nick,
The direct signal from the beacon should be a straight line on a waterfall display, showing constant frequency. A parallel line above that or to the right ( depending on how you are viewing your display) indicates an object going towards the beacon at constant speed. A sloping or curved line line indicates an accelerating/decelerating object. Signals to the left/below indicate objects moving away from the beacon. This usually results from aircraft reflections that are coming from an a/c flying at an angle to the line of site path at constant speed; the change in angular displacement causes the acceleration ( cf satellites in orbit).
When I have viewed signals from RAL on 6m, ( using ARGO) they are usually curved, which indicates the rate of acceleration is changing. This may be due to the a/c being in a turn but could also be a result of and a/c in straight & level flight at constant speed. So "yes" you may be able to use this information to track the a/c with the virtual radar.
If you get any signals which touch or cross the beacon line, then this indicates the aircraft has crossed a line perpendicular to the track of the direct beacon signal. At the point where the traces cross, the a/c must be at a similar range to the beacon, which should help with tracking.

de John G8SEQ.

-------Original Message-------
From: Nick <nickg0hik@googlemail.com>
To: ukmicrowaves@yahoogroups.com
Subject: [ukmicrowaves] Re: Help, how to calculate distance from Doppler frequency please
Sent: Mar 30 '10 20:32

Hi John,

Many thanks for that.

I often see a second trace go off at a tangent to the directly received
signal.
Am I correct in deducing that what looks to be acceleration or
deceleration is that the a/c is actually on a flight path at a tangent to
the main signal.
If this is the case it should be possible to tie this in with a flight
track in the virtual radar.

Regards

Nick


GB3CAM 24GHz update

g4bao
 

The beacon is currently off air for reasons unknown. I'm going up to the site tomorrow (Wednesday) to collect the beacon and bring it back here for repair and update to GPS locking. How long it takes before it comes back depends on the extent of the problem!

Further updates will be published here.

73
John

--
G4BAO
QRV 1296 MHz,3400 MHz and 10368 MHz
Beacon keeper GB3CAM/24GHz
www.g4bao.com


Re: Help, how to calculate distance from Doppler frequency please

Nick Gregory G0HIK
 

Hi John,

Many thanks for that.

I often see a second trace go off at a tangent to the directly received signal.
Am I correct in deducing that what looks to be acceleration or deceleration is that the a/c is actually on a flight path at a tangent to the main signal.
If this is the case it should be possible to tie this in with a flight track in the virtual radar.

Regards

Nick

--- In ukmicrowaves@yahoogroups.com, <john@...> wrote:

Frequency shift correllates to relative speed between Tx & Rx not distance. Delay correlates to difference in path length. Neither will tell you where the a/c is. You need an extra piece of info. ie the angular difference between the direct signal and the reflected signal to calculate the position of the a/c. Strictly speaking it needs to be the solid angle, but two angles, one horizontal and one vertical can be used to give azimuth and altitude information.

de John G8SEQ


-------Original Message-------
From: Nick <nickg0hik@...>
To: ukmicrowaves@yahoogroups.com
Subject: [ukmicrowaves] Help, how to calculate distance from Doppler frequency please
Sent: Mar 30 '10 14:39

Hi All,

I've been monitoring GB3ANG with Spectran and would like to correlate the
shifts to the aircraft tracks in Radarvirtuel.

Can anyone help me with the calculation of shift to distance.

Many thanks

Nick (G0HIK)



Off Topic - Anyone travelling to Holland in the next few weeks?

g4cch_1
 

Sorry for the off topic subject...

Is anyone travelling to Holland in the next few weeks?

I am purchasing SSPA from someone there and am looking for a low cost way to get it back to the UK.

Many thanks in advance

Howard, G4CCH


Re: Help, how to calculate distance from Doppler frequency please

John E. Beech
 

Frequency shift correllates to relative speed between Tx & Rx not distance. Delay correlates to difference in path length. Neither will tell you where the a/c is. You need an extra piece of info. ie the angular difference between the direct signal and the reflected signal to calculate the position of the a/c. Strictly speaking it needs to be the solid angle, but two angles, one horizontal and one vertical can be used to give azimuth and altitude information.

de John G8SEQ

-------Original Message-------
From: Nick <nickg0hik@googlemail.com>
To: ukmicrowaves@yahoogroups.com
Subject: [ukmicrowaves] Help, how to calculate distance from Doppler frequency please
Sent: Mar 30 '10 14:39

Hi All,

I've been monitoring GB3ANG with Spectran and would like to correlate the
shifts to the aircraft tracks in Radarvirtuel.

Can anyone help me with the calculation of shift to distance.

Many thanks

Nick (G0HIK)



Help, how to calculate distance from Doppler frequency please

Nick Gregory G0HIK
 

Hi All,

I've been monitoring GB3ANG with Spectran and would like to correlate the shifts to the aircraft tracks in Radarvirtuel.

Can anyone help me with the calculation of shift to distance.

Many thanks

Nick (G0HIK)


March 2010 Scatterpoint

Peter Day <microwaves@...>
 

To all readers of the paper version of Scatterpoint:

I've just got back from an overseas trip to find that you have not yet
received the March edition of Scatterpoint. A few minutes ago, I
phoned the printers who tell me that it will shortly be on its way to
you. They've had the master copy since 11th March so I was surprised
that they hadn't posted it before now. Ours is a very small order
compared to their other jobs so I guess they fit us in when they are
not too busy!

You should receive Scatterpoint very soon.

regards,

Peter Day, G3PHO

Editor


Tonight - Microwave Activity Night, 3/29/2010, 8:00 pm

ukmicrowaves@...
 

Reminder from:   ukmicrowaves Yahoo! Group
 
Title:   Tonight - Microwave Activity Night
 
Date:   Monday March 29, 2010
Time:   8:00 pm - 9:00 pm
Repeats:   This event repeats every week.
Notes:   Monday nights are traditionally microwave activity nights. Why not try listening around at 20:00 local time? Better still, call CQ! Consider using KST to co-ordinate activities:

http://www.on4kst.com/chat/start.php
 
Copyright © 2010  Yahoo! Inc. All Rights Reserved | Terms of Service | Privacy Policy


GB3CAM 24GHz beacon

g4bao
 

Bad news I'm afraid, I think the 24GHz beacon has failed, neither Roger G4BEL or Charlie G3WDG can hear it and they usually can. I've no 24GHz gear at the moment. I'll arrange to get up there at some point i the next week or so and get it back here to look at. At the same time, I'll fit the reverse DDS and the GPS reference, but it may be off the air for a while.

Sorry folks

73
John

--
G4BAO
QRV 1296 MHz,3400 MHz and 10368 MHz
Beacon keeper GB3CAM/24GHz
www.g4bao.com


Re: RSGB UHF UKAC Results

gm4cxm <gm4cxm@...>
 

--- In ukmicrowaves@yahoogroups.com, Richard Cooper G4WFR <vhf@...> wrote:

Hi all,
Just to let you know that I have now uploaded the latest UHF UKAC
results to include the March session.
Great support, 32 logs received on 23cm - Many thanks & keep up the good work.
http://www.rsgbcc.org/vhf/results/10/uhfukac.html

Thanks for the prompt adjudication Richard.


32 logs is a fantastic turnaround in activity on 23cm and even 13cm was up on Jan/Feb entries. Congratulations to Ian G8IFT at G8OHM for winning this months open section with a qso tally working out at around 1 contact every 3 minutes. A similar story in the restricted section with Tony GW8ASD netting 36 contacts and where there is some equally stiff competition.

Pleasing to see a few new faces and in particular some older hands returning to the band(s) and also the high number of stations running around 10w or less. A few make it into my log despite the 500Km distance but hardly any of the 200 - 300Km ones manage it. Possibly this is because they don't beam this way or don't correlate schedules on 'KST?

Comparing the claimed and final scores, a number lost precious points or square multipliers which changed ultimate positions. I've been in the same boat myself more than once and it certainly keeps you on your toes when working weaker stations.

The next event on the low bands will be the UKuG Low Bands contest on April 11th. Unfortunately it clashes with the Norbreck Rally in Blackpool which is the closest "biggy" GM's can get to by car so I won't be on for that contest but should be available for the next UKAC on April 20th.

73 Ray GM4CXM


Re: N connector

Russ Stewart <g4pbp@...>
 

Liviu Babi wrote:
I am asking that just because I use only N connectors at 1.7 KW out for 144 MHz EME for last 3 years and a friend of mine told me I was lucky. Not any faults even in 24 hours EME contest in digital mode. Have very good swr 1:1 at 1,7 KW out.
YO4FNG
Liviu

------------------------------------------------------------------------
*From:* G3XDY <g3xdy@btinternet.com>
*To:* ukmicrowaves@yahoogroups.com
*Sent:* Sat, March 27, 2010 8:18:14 PM
*Subject:* Re: [ukmicrowaves] N connector


Hi Liviu
A good N type should be capable of handling 1kW so long as the VSWR is low and the plug and socket are in good condition. Be aware that recently manufactured cheap commercial N types may use polypropylene insulation instead of PTFE, and they will melt at high powers.
Worn N types may have poor female centre contact pressure, leading to local hot spots that can destroy the connector. Unused "Precision N" female connectors may be worth looking for - they usually have 6 or 8 gold plated splines on the female connector inner and should exhibit lower contact resistance.
73
John G3XDY

----- Original Message -----
*From:* Liviu Babi <mailto:electronicguest@yahoo.com>
*To:* ukmicrowaves@ yahoogroups. com
<mailto:ukmicrowaves@yahoogroups.com>
*Sent:* Saturday, March 27, 2010 3:25 PM
*Subject:* [ukmicrowaves] N connector

What power can handle a good N connector ?
Liviu
YO4FNG

Hi Livi, safer to use 7/16 connectors above 1KW. N-type don't make very good fuses Hi.
Have a chat with the SM and OZ guys, they may be able to help. Also when I am in SM/OZ in May, I will have a look for you.

Russ ... g4pbp


Re: on4kst

Brian Flynn GM8BJF
 

Hi Dave,

I did this for a vodafone GPRS card for s laptop some time ago.
here is the link

http://myweb.tiscali.co.uk/gm8bjf/GPRS.html

I suspect the basics are the same between networks.

Brian,
GM8BJF

--- In ukmicrowaves@yahoogroups.com, "Dave" <davecossar@...> wrote:



Hi,



I'm still trying to get my Nokia mobile phone to connect to the ON4KST site







I can get my laptop to recognise the usb connection and it shows upon the
network as connected to the computer.







So is there a dial up number I have to use or a user name or password?







I've been on to O2 my phone is set for the web so what's the procedure in
using the EA6VQ client server.



O2 have said that pay as you go do not have the facility for telenet client
server I need an upgrade to a monthly tarrif







Dave GM3WIL


Re: N connector

Liviu Babi <electronicguest@...>
 

I am asking that just because I use only N connectors at 1.7 KW out for 144 MHz EME for last 3 years and a friend of mine told me I was lucky. Not any faults even in 24 hours EME contest in digital mode. Have very good swr 1:1 at 1,7 KW out.
 
YO4FNG
Liviu


From: G3XDY
To: ukmicrowaves@...
Sent: Sat, March 27, 2010 8:18:14 PM
Subject: Re: [ukmicrowaves] N connector

 

Hi Liviu
 
A good N type should be capable of handling 1kW so long as the VSWR is low and the plug and socket are in good condition. Be aware that recently manufactured cheap commercial N types may use polypropylene insulation instead of PTFE, and they will melt at high powers.
 
Worn N types may have poor female centre contact pressure, leading to local hot spots that can destroy the connector. Unused "Precision N" female connectors may be worth looking for - they usually have 6 or 8 gold plated splines on the female connector inner and should exhibit lower contact resistance.
 
73
 
John G3XDY
----- Original Message -----
From: Liviu Babi
Sent: Saturday, March 27, 2010 3:25 PM
Subject: [ukmicrowaves] N connector

What power can handle a good N connector ?
 
Liviu
YO4FNG 



Re: N connector

John Quarmby
 

Hi Liviu
 
A good N type should be capable of handling 1kW so long as the VSWR is low and the plug and socket are in good condition. Be aware that recently manufactured cheap commercial N types may use polypropylene insulation instead of PTFE, and they will melt at high powers.
 
Worn N types may have poor female centre contact pressure, leading to local hot spots that can destroy the connector. Unused "Precision N" female connectors may be worth looking for - they usually have 6 or 8 gold plated splines on the female connector inner and should exhibit lower contact resistance.
 
73
 
John G3XDY

----- Original Message -----
From: Liviu Babi
Sent: Saturday, March 27, 2010 3:25 PM
Subject: [ukmicrowaves] N connector

What power can handle a good N connector ?
 
Liviu
YO4FNG 


Wanted - ATF10135's

Doug G4DZU
 

Hi,

Does anyone have a couple of ATF10135's gathering dust on their shelf that they would like to part with.

Thanks
Doug
G4DZU


Farnham 5.7Ghz beacon

Ralph
 

Sorry Brian and John,
 
I have had my receiver running on the frequency all afternoon since receiving notification
and nothing received. Conditions a little poor to the east as Bellhill 5.7GHz is not very strong
today. Will spot it as soon as it is detected here
 
73
Ralph


N connector

Liviu Babi <electronicguest@...>
 

What power can handle a good N connector ?
 
Liviu
YO4FNG 


Re: Farnham Beacon RDDS upgrade

Graham - G4FSG
 

Brian

 

Many thanks – I switched on the 5.7GHz system, left it for 30 minutes, tuned to what I thought was 5760.920 and there it was at 519 at 175km. It is the only non MHx beacon that I can reliably hear on 5.7 or 10G under normal conditions with my poor home take off.

 

I can now set my 5.7G frequency!!

 

I have spotted it and updated beaconspot.eu

 

Thanks again, particularly to you and John!

 

73

 

Graham

Hello Folks

I am pleased to report that following the RDDS upgrades the Farnham beacons are back on the air and on Frequency. We checked the 47GHz beacon on site and that's on frequency too. The 5.7GHz and 24GHz beacons with the RDDS modifications have now been received by John G8ACE and myself from our home QTHs.

Reports on beaconspot would be welcome.

73 Brian G4NNS.