Date   

Welcome Aboard!

gm4plm <simon@...>
 

Welcome! As an attempt to kick start some co-ordinated activity
between UK microwavers (and close friends in EU) I thank you for your
interest and your joining this group.

The group is for discussion of amateur radio above 1 GHz, any mode,
any style (ie terrestrial satellite EME etc) - Please be an active
addition to the group and share news and information that you know
of.

It seems there is much going on in the UK but in isolated groups.
News does not seem to penetrate everywhere and much of it gets
missed. I visualise this group as spreading news, information etc
around the UK (and EU as our close neighbours). This should include
whats available on the second hand and surplus markets and what
events are coming up, contests etc. I do notice that information on
surplus items gets banded about but does not reach some parts of the
UK outside the central belt!

Please use the group constructively and responsibly. I don't want it
to turn into a soapbox, RSGB bashing ground, or an area for personal
attacks. Lets be sensible but constructive - its not a moderated
group and I am not the censor - I only set it up to try and stimulate
some activity in the hope this will permeate to the bands!

Thanks for your time and interest!

feel free to post away!

73 Simon GM4PLM


Question about RF Power Meter

Howard Long <hlong@...>
 

I recently purchased a 2nd hand Marconi 6950 RF Power meter with a
6910 probe covering 10MHz to 20GHz.

It's OK on the 5dBm and above ranges, but at the 0dBm and below
ranges there is an increasingly large zero offset as the range
decreases further.

Is this likely to be the probe or the meter, and if so is it simply a
calibration job or is one of these bits likely to be dodgey, and
therefore I am the pround owner of a kipper?

73 Howard G6LVB


Re: Question about RF Power Meter

gm4plm <simon@...>
 

Hey Howard

hope your well.

You coming to Martlesham??

I am not familiar with that meter but there are a couple of
possibilities:

1. the head has been overloaded (prob the reason)

2. the calibration of the unit is out.

I was looking for details of a Marconi 6559 meter on the net and
found a few places with handbooks. Maybe that will help.

Its likely that the meter has been overloaded and the head is now
misalligned - I have some details in the Microwave Updates on fixing
these thermistor type heads - I will see what I can find for you.

Regards

Simon GM4PLM


--- In ukmicrowaves@y..., "Howard Long" <hlong@b...> wrote:
I recently purchased a 2nd hand Marconi 6950 RF Power meter with a
6910 probe covering 10MHz to 20GHz.

It's OK on the 5dBm and above ranges, but at the 0dBm and below
ranges there is an increasingly large zero offset as the range
decreases further.

Is this likely to be the probe or the meter, and if so is it simply
a
calibration job or is one of these bits likely to be dodgey, and
therefore I am the pround owner of a kipper?

73 Howard G6LVB


ebay - 3.4 GHz 20W Ionica PA FS

gm4plm <simon@...>
 

item number 1383247307

not mine but may be of interest - info on Mark ISM's site at
www.dc2light.co.uk

regards

Simon GM4PLM


Re: Question about RF Power Meter

p.day <peter@...>
 

-----Original Message-----
From: Howard Long [mailto:hlong@...]
I recently purchased a 2nd hand Marconi 6950 RF Power meter with a
6910 probe covering 10MHz to 20GHz.

It's OK on the 5dBm and above ranges, but at the 0dBm and below
ranges there is an increasingly large zero offset as the range
decreases further.

Marconi meters such as the 6460 type (mine) do tend to do this in the low
power setting and there should be a "zero adjust" pot on the front panel. I
always set mine up in the 30uW switch position after the unit has warmed up
for some minutes even if I'm measuring much higher power levels.

Does your meter have a built in calibration output? Mine has. It's on 50MHz
and reads full scale
with any head I care to plug in..


Good luck!

Peter, G3PHO

+++++++++++++++++++++++++++++++++++
Editor: RSGB Microwave Newsletter
Amateur Microwave Radio Webpage:
http://www.g3pho.free-online.co.uk
+++++++++++++++++++++++++++++++++++


TWT INFO WANTED

p.day <peter@...>
 

Does anyone have information on the Siemens TWT type W3MT/3A ?

I particular need power supply requirements and plug/socket connection
details.

I already have details of frequency coverage, power o/p, gain and NF etc.

Peter, G3PHO
+++++++++++++++++++++++++++++++++++
Editor: RSGB Microwave Newsletter
Amateur Microwave Radio Webpage:
http://www.g3pho.free-online.co.uk
+++++++++++++++++++++++++++++++++++


GB3MHX

SAM JEWELL
 

Hi folks,
I am pleased to announce that GB3MHX (10368.830MHz) located in
JO02PB, Martlesham, returned to service ealier today (26th September)
with an increase in output power to 0.5W into the antenna. This
should make the beacon more suited to rainscatter propagation
monitoring. The frequency of the beacon has also been reset to the
correct frequency. It was about 8kHz high after more than 5 years of
non-resetting (crystal aging). The new frequency was measured to be
800Hz low of .830. Normal diurnal cycling in the tower room will
cause the beacon to settle about .830, but further crystal aging will
mean resetting again in about 12 months or so.

There will be further news of a new beacon at Martlesham later from
one of the G4MRS team.

regards

Sam


Re: GB3MHX

gm4plm <simon@...>
 

Thanks Sam

I will add that to the next columns.

Good to have you on board here!

regards

Simon GM4PLM


--- In ukmicrowaves@y..., "g4ddk" <jewell@b...> wrote:
Hi folks,
I am pleased to announce that GB3MHX (10368.830MHz) located in
JO02PB, Martlesham, returned to service ealier today (26th
September)
with an increase in output power to 0.5W into the antenna. This
should make the beacon more suited to rainscatter propagation
monitoring. The frequency of the beacon has also been reset to the
correct frequency. It was about 8kHz high after more than 5 years
of
non-resetting (crystal aging). The new frequency was measured to
be
800Hz low of .830. Normal diurnal cycling in the tower room will
cause the beacon to settle about .830, but further crystal aging
will
mean resetting again in about 12 months or so.

There will be further news of a new beacon at Martlesham later
from
one of the G4MRS team.

regards

Sam


circuit digram

richard bown <richard.bown@...>
 

Hi All, has anyone got a circuit diagram for a FT480 ?
The AGC is poor and using it for the if on 10 & 2.3 GHz,its a wee bit
difficult, to determine if the signals getting stronger or weaker.
The LED bargraph dos'nt move until a signal is S9 by ear
--
Best regards & 73
Richard Bown, G8JVM

Tel +44 1952 502550
Mobile 07850 865224










75167




JVM RF & EMC Solutions Ltd. Registered office, Park View, Chapel St,
Telford TF4 3DD. Registered in the United Kingdom 3538979


Marconi 6550B info

gm4plm <simon@...>
 

Anyone got any info on this meter??

I would like to know what model heads it can use??

regards

Simon GM4PLM


Martlesham Microwave Beacons Update

John Quarmby
 

We braved the winds today and managed to get the antennas for the GB3MHS
3.4GHz beacon installed, and re-installed the 10GHz Beacon at the same time.
We also checked and reset all the beacons using a GPS locked frequency
counter, so they should be very close to their nominal frequencies now.

The new GB3MHS 3.4GHz beacon uses a DB6NT beacon tansmitter unit feeding an
ex-Ionica PA module. This is followed by an 8 cavity filter (again ex Ionica
Base station), and produces about 10W at the output connector. Keying is
courtesy of a WW2R/G4FRE PIC keyer. The antennas are also ex Ionica (thanks
to Mark GM4ISM), with 14dBi gain and 120 degree horizontal beamwidth. One
beams East (covers 030 to 150 degrees), the other West (210 to 330 degrees),
and taking into account feeder losses the EIRP is about 75W. Reception
reports will be very welcome.

On 10GHz the outdoor multiplier/PA unit has been re-built by Sam G4DDK to
include a PA module donated by G4BAH and now produces 500mW at the antenna,
giving an EIRP of about 5W, a 7dB increase on the previous system. We hope
that the increased power will be useful for spotting rainscatter conditions.
Again, reception reports by email or on the DXCluster are always
appreciated.

The beacons are located 10km East of Ipswich in JO02PB.

73

John G3XDY
Martlesham Beacon Keeper


Re: GB3MHX

SAM JEWELL
 

Hi Simon,
well I subscribe to the Tom Williams reflector and find that most useful. I
wondered how long before someone would (seriouisly) take to do the same
here. I think it will fill a long held need. Congratulations on setting it
up.

73 de Sam

----- Original Message -----
From: "gm4plm" <simon@...>
To: <ukmicrowaves@...>
Sent: Thursday, September 26, 2002 8:26 PM
Subject: [ukmicrowaves] Re: GB3MHX



Thanks Sam

I will add that to the next columns.

Good to have you on board here!

regards

Simon GM4PLM


--- In ukmicrowaves@y..., "g4ddk" <jewell@b...> wrote:
Hi folks,
I am pleased to announce that GB3MHX (10368.830MHz) located in
JO02PB, Martlesham, returned to service ealier today (26th
September)
with an increase in output power to 0.5W into the antenna. This
should make the beacon more suited to rainscatter propagation
monitoring. The frequency of the beacon has also been reset to the
correct frequency. It was about 8kHz high after more than 5 years
of
non-resetting (crystal aging). The new frequency was measured to
be
800Hz low of .830. Normal diurnal cycling in the tower room will
cause the beacon to settle about .830, but further crystal aging
will
mean resetting again in about 12 months or so.

There will be further news of a new beacon at Martlesham later
from
one of the G4MRS team.

regards

Sam


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Re: GB3MHX

gm4plm <simon@...>
 

--- In ukmicrowaves@y..., "Sam Jewell" <jewell@b...> wrote:
Hi Simon,
well I subscribe to the Tom Williams reflector and find that most
useful. I
wondered how long before someone would (seriouisly) take to do the
same
here. I think it will fill a long held need. Congratulations on
setting it
up.

73 de Sam

Hi Sam

Well I sat wondering if someone already set one up and I was missing
something, but then realised actually no one had! Maybe thats been
the problem! And to be honest it took all of 30 mins to set up the
group as I wanted as the admin. But as I said I don't intend to
interfere (unless things start getting nasty!) but just let it run.
Hopefully people will join in as time goes on, it will take time to
get the word out. So far in 2 days we have 22 members and I am sure
that will rise after the weekend's activity.

I also subscribe to the US microwave reflector and there are some
regular UK names on there too so it made sense to have a UK version.

What worried me most was that things are happening in the UK and
people are missing the info/news/for sales etc and that is a shame.
We have some seriously clever and advanced microwavers in the UK but
everyone seems to be doing their own thing and there seems to be lack
of a focal point for whats going on.

So that was the idea - it should be useful and so far I have been
encouraged that it will do so.

I just can't believe no one got round to doing this before!

I used Peter PHO's email list for the first round of invites and if
you don't see anyone on here you think would be interested in it then
please let them know the address where to find it. I am not sure if
having to have a yahoo acct puts some people off. It shouldn't. I
never receive anything from Yahoo unsolicited unlike MS!

I will publicse the address in the next set of newsletters and
hopefully that will also encourage some activity.

thanks for the support!

(still looking for that dish !)

regards

Simon GM4PLM


Group functions available

gm4plm <simon@...>
 

All,

please be aware that there are some group functions available

you can see them...

<----- here in the left column of the screen.

You can chat realtime with other group users, store files and photos
here.

I have not yet tied these down and we have 32mb of storage available
before we have to archive off.

Please utilise these as you feel free.


regards

Simon GM4PLM


Settings

Ciemon Dunville G0TRT <lists@...>
 

Hi Simon et al,

Great idea Simon, I just hope that most of the discussions here won't go
over my head for too long!

I run a couple of yahoo lists, and I'm pretty sure that if you subcribe to
the list via email rather than going too yahoo that you don't need a yahoo
account, I'll look into that this weekend and get back to you.

73.. Ciemon G0TRT


Re: Settings

gm4plm <simon@...>
 

--- In ukmicrowaves@y..., "Ciemon Dunville G0TRT" <lists@a...> wrote:
Hi Simon et al,

Great idea Simon, I just hope that most of the discussions here
won't go
over my head for too long!

I run a couple of yahoo lists, and I'm pretty sure that if you
subcribe to
the list via email rather than going too yahoo that you don't need
a yahoo
account, I'll look into that this weekend and get back to you.

73.. Ciemon G0TRT
That would be intersting Ciemon and I am sure you're right.

Prob just need a yahoo acct for web access.

I forgot you can do both!

hope you got the ISP sorted!

regards

Simon GM4PLM


Re: GB3MHX

SAM JEWELL
 

Hi Simon,
well, I believe there is or was a reflector set up by G8MWR some time ago. I
rarely if ever saw references to it and don't know if it was ever widely
used. I was supposed to get in touch with Glenn to see if the UK Microwave
Group could adopt it as the reflector for the group, but I must admit that I
had reservations about doing so and then things kind of drifted. You already
have one new user as a result of my mentioning the group in a conversation
last night.

You will have seen G3XDY's mention of the new 9cm beacon. I'm pleased to say
that when I brought my 9cm transverter out of it's 2.5 year hibernation and
connected a small horn antenna the beacon nearly blew my socks off even when
pointing in the other direction from the beacon site and with no mutual
visibility. The horn is inside the shack and looks through a small window.
These results encouraged me to try a QSO with G3LQR and I'm pleased to
report that that was successful in spite of the antenna challenged
arrangement at my end. So, will we now see more 9cm activity as a result of
the new beacon and the fact that a similar antenna arrangement to GB3MHS has
been delivered to DF6NA in Wuerzburg for his 9cm beacon? I hope so. Time
will tell, but what a fabulous band for troposcatter propagation.

73 de Sam


Re: GB3MHX

gm4plm <simon@...>
 

Hi Sam

didn't know about the G8MWR reflector - not seen or hrd from Glen for
a long time - think he still loves in coventry - my WBFM gear was
powered by all his work!

Thanks for the mention - I am sure the reflector will expand as word
gets round.

OK on the 3.4g beacon

Well I am going to be much more active next year - I have done DXCC
on 6m now (122 countrys!) and so will be looking for microwave
challenges now thats out my system! - think I will be concentrating
on the lower bands - have 23cms near sorted - LT23s plus 2 x 2c39's -
4 x 48 ele loops so shud be a good sig - 2.3 is lacking - only 1 watt
but been chasing some amps from US but nothing come of that so far -
3.4 - got 40 watts on that band - 1.2m dish - was going to build a
DK1UV feed for the dish so I can run multiple bands off one feed.
6cms - 10 watts and 1.2m - 10g - 10 watts 1.2m

I was chasing some 24g gear from the US and had two PCOM units lined
up but the guy emailed today after I asked him to take the lids off
the unit and photo them for me, to say that half the insides are
missing -seems he paid 100USD for empty space! ooppps!

So... hope to be a bit more active - Dave GM4WLL will prob be joining
me too.

If someone has some spare 24g gear I'll get on and activate it! Peter
PHO has given me some tips for sites so will be looking at that over
the winter too!

I fancied some 23cms EME but will have to wait until I get the dish
sorted.

Maybe chat on 9cms sometime soon!

regards

Simon GM4PLM



--- In ukmicrowaves@y..., "Sam Jewell" <jewell@b...> wrote:
Hi Simon,
well, I believe there is or was a reflector set up by G8MWR some
time ago. I
rarely if ever saw references to it and don't know if it was ever
widely
used. I was supposed to get in touch with Glenn to see if the UK
Microwave
Group could adopt it as the reflector for the group, but I must
admit that I
had reservations about doing so and then things kind of drifted.
You already
have one new user as a result of my mentioning the group in a
conversation
last night.

You will have seen G3XDY's mention of the new 9cm beacon. I'm
pleased to say
that when I brought my 9cm transverter out of it's 2.5 year
hibernation and
connected a small horn antenna the beacon nearly blew my socks off
even when
pointing in the other direction from the beacon site and with no
mutual
visibility. The horn is inside the shack and looks through a small
window.
These results encouraged me to try a QSO with G3LQR and I'm pleased
to
report that that was successful in spite of the antenna challenged
arrangement at my end. So, will we now see more 9cm activity as a
result of
the new beacon and the fact that a similar antenna arrangement to
GB3MHS has
been delivered to DF6NA in Wuerzburg for his 9cm beacon? I hope so.
Time
will tell, but what a fabulous band for troposcatter propagation.

73 de Sam


DUBUS 2/2002 Mailed 20 Sept - Important Announcement - Please Read!

gm4plm <simon@...>
 

Issue 2/2002 was mailed to all subscribers on 20 September.

The deadline for issue 3/2002 is 22 October, with a expected mailing
date of of 11 November.

Please read the editorial (for 2/2002) by Joachim Kraft below:

Dear DUBUS Reader! I apologize for being so late with this issue No.
2/2002. In July the health status from our chief editor Rainer
Bertelsmeier, DJ9BV, suddenly got really worse. He had just started
with the work for this issue, and at the end of August I took over
the complete work of editing. Unfortunately Rainer will not be able
to do any work for DUBUS in the future.

This causes a big hole for DUBUS, because it will be almost
impossible to substitute for Rainer. He has been the technical editor
for DUBUS since issue 4/1988, and he also wrote many articles. His
articles about yagis and preamps have set the state of the art. Also
Rainer made the complete layout of each DUBUS issue.

Nowadays it is impossible to find any one person who could do all
this work in their own rare free time. Myself I will do all the
layout work in the future, but instead of having a single technical
editor I have suggested to build a team of technical editors and
authors for DUBUS.

I have to thank Ian White, G3SEK, who spontaneously was the first to
say yes to this proposal. Michael Kuhne, DB6NT has also agreed to be
part of the team. I would be happy if other of the previous DUBUS
authors - and new ones, of course - would join this group. For
details please contact me.

I will do my very best to make DUBUS continue to be an interesting
magazine, and I promise that DUBUS will come regularly again from
now! In the coming issue No. 3/2002 we will make a big poll about the
content and future of DUBUS.

Finally, I want to say a strong thank you - and also in the name of
all VHF/UHF/SHF amateurs - to Rainer, DJ9BV, for all his outstanding
work for us during the past 13 years!

73

Joe, DL8HCZ

PS: Luis, CT1DMK has also become a member of the technical editing
team.


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

I have sent our best wishes on behalf of the UK microwave fraternity
wishing Rainer a speedy recovery.

I will be continuing to edit the Microwave Europe column.

There will be some changes I think in the way DUBUS is being run and
organised - if you subscribe please pay attention to the editorials
for the latest news

If your interested in subscribing and if you're into VHF and up then
its really a must then please see the UK reps (G4PMK) website at
http://www.marsport.demon.co.uk/dubus.htm

regards

Simon GM4PLM
Editor - DUBUS Microwave Europe Column


Re: GB3MHX

SAM JEWELL
 

Hi Simon,
I brought back some PCN1900 amplifiers from my Dayton trip. The transistors
in some of these should be equally as usuable on 13cm as the Siemens units
from DL4MEA. I get 25W from my DL4MEA/Siemens amplifier (drive limited, not
output). I have also now successfully modified one of the Siemens DCS1800
amplifiers down to 23cm. I am getting 35W out but have run out of drive
there as welll. It looks good for at least 50W and the IMD performance of
these DCS and PCN amplifiers is superb on the usual 26V supply. I've also
recently obtained some new surplus amplifiers for both 900GSM and 1800DCS
and these also look good for mod'ing. I saw one of these at Weinheim already
mod'ed for 23cm and giving over 50W out. The future look bright, the future
look (well, you know!).

Now my neighbour has erected his 6 foot fence I am ready to get my 23cm EME
dish project back on the rails. Have one of the new 'Prague' rectangular
circular waveguide feeds. Hope to give it a try shortly. Kits for these may
be available soon from a colleague in Munich.

73 de Sam

----- Original Message -----
From: "gm4plm" <simon@...>
To: <ukmicrowaves@...>
Sent: Friday, September 27, 2002 3:38 PM
Subject: [ukmicrowaves] Re: GB3MHX


Hi Sam

didn't know about the G8MWR reflector - not seen or hrd from Glen for
a long time - think he still loves in coventry - my WBFM gear was
powered by all his work!

Thanks for the mention - I am sure the reflector will expand as word
gets round.

OK on the 3.4g beacon

Well I am going to be much more active next year - I have done DXCC
on 6m now (122 countrys!) and so will be looking for microwave
challenges now thats out my system! - think I will be concentrating
on the lower bands - have 23cms near sorted - LT23s plus 2 x 2c39's -
4 x 48 ele loops so shud be a good sig - 2.3 is lacking - only 1 watt
but been chasing some amps from US but nothing come of that so far -
3.4 - got 40 watts on that band - 1.2m dish - was going to build a
DK1UV feed for the dish so I can run multiple bands off one feed.
6cms - 10 watts and 1.2m - 10g - 10 watts 1.2m

I was chasing some 24g gear from the US and had two PCOM units lined
up but the guy emailed today after I asked him to take the lids off
the unit and photo them for me, to say that half the insides are
missing -seems he paid 100USD for empty space! ooppps!

So... hope to be a bit more active - Dave GM4WLL will prob be joining
me too.

If someone has some spare 24g gear I'll get on and activate it! Peter
PHO has given me some tips for sites so will be looking at that over
the winter too!

I fancied some 23cms EME but will have to wait until I get the dish
sorted.

Maybe chat on 9cms sometime soon!

regards

Simon GM4PLM



--- In ukmicrowaves@y..., "Sam Jewell" <jewell@b...> wrote:
Hi Simon,
well, I believe there is or was a reflector set up by G8MWR some
time ago. I
rarely if ever saw references to it and don't know if it was ever
widely
used. I was supposed to get in touch with Glenn to see if the UK
Microwave
Group could adopt it as the reflector for the group, but I must
admit that I
had reservations about doing so and then things kind of drifted.
You already
have one new user as a result of my mentioning the group in a
conversation
last night.

You will have seen G3XDY's mention of the new 9cm beacon. I'm
pleased to say
that when I brought my 9cm transverter out of it's 2.5 year
hibernation and
connected a small horn antenna the beacon nearly blew my socks off
even when
pointing in the other direction from the beacon site and with no
mutual
visibility. The horn is inside the shack and looks through a small
window.
These results encouraged me to try a QSO with G3LQR and I'm pleased
to
report that that was successful in spite of the antenna challenged
arrangement at my end. So, will we now see more 9cm activity as a
result of
the new beacon and the fact that a similar antenna arrangement to
GB3MHS has
been delivered to DF6NA in Wuerzburg for his 9cm beacon? I hope so.
Time
will tell, but what a fabulous band for troposcatter propagation.

73 de Sam


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