Date   

Conductive epoxy

Chris Bartram <yahoo@...>
 

I can't answer the question - I'd like an answer myself, 'cos at £50 for the
RS product, I'm rather put off!

While trawling the net I did come across a site which suggested making silver
loaded epoxy yourself by buying silver powder, and mixing it 50/50
(presumably by volume) with the epoxy/hardener mix. I haven't investigated
silver powder yet, but that's presumably available at a reasonable price from
chemical reagent suppliers.

Vy 73

Chris
GW4DGU


Silver loaded epoxy..where?

Chris G8BKE
 

Anyone know of a cheap source of SMALL quantities of silver loaded conductive epoxy for sticking
microwave leadless diodes in place?

Most suppliers seem to sell it by the bucket load at huge cost and it goes off before you can use it
all.

(Silver loaded paint is a non-starter as its not conductive enough)

73 de Chris G8BKE

Web Site:-
http://www.qsl.net/g8bke/index.html


Re: sky dish

Chris G8BKE
 

Bob,

I have used this dish with a the dual mode feedhorn for 10GHz
http://www.qsl.net/g3pho/horn.htm

and also a dual band feed horn for 10 and 24G albeit not "in anger" out /P! However with both feeds
it seems to perform well on beacon reception compared with say a 60cms offset.
http://myweb.tiscali.co.uk/g8bke/tenghz.htm


Chris





Hi
I would be interested in anyone using a 'sky' type dish on 3cms that
is one 50cms wide and 40cms high details of thier findings re feed
horn etc at present I am using the original.
Regards
Bob








Yahoo! Groups Links


Re: dmc 24g tvtrs??

gm4plm <simon@...>
 

Some of you must have bought these boxes at rallies last year

can someone email me a quick pic of the external view and internals
and some rough internal dimensions of the box please?

that would be appreciated!

thanks!

Simon


--- In ukmicrowaves@..., "gm4plm" <simon@...> wrote:

If anyone else has a unused DMC case I would glas to hear from you!

Andy GM7GDE (now DL5KAH) is going to use my old WGD 10g system
from
his home QTH in Düsseldorf

So another case would not go amiss to help him

he has my old wdg system and we just got him a 1w pa so he will be
a
newcomer on the band!

rgds

Simon DL4PLM/GM4PLM/PA4...... !






--- In ukmicrowaves@..., "gm4plm" <simon@> wrote:

what was the name of the company in Burton(?) that sold the 24g
parts??

I am looking for the case that houses these

does anyone have a spare DMC unit they have ripped all the parts
out??

rgds

Simon Dl4PLM


Re: contact details for Taurus Electronics (??)

gm4plm <simon@...>
 

Ahhh perfik!

thanks!!

Simon

--- In ukmicrowaves@..., geoffg7rmg@... wrote:

Charles on 01509 646822
73 's Geoff M0RMG


Re: contact details for Taurus Electronics (??)

gm4plm <simon@...>
 

Mike

I know the site but didnt see anything on there.

Not sure this was the same people

they appeared in friedrichshafen and weinheim last year

remember they had all the 24g stuff set out?

I thought it was taurus but I couldnt see the details on the ham
radio website with the display list

!

typical!

:-)




--- In ukmicrowaves@..., "Willis, MJ &#92;(Michael&#92;)"
<m.j.willis@...> wrote:

Try Sinequanon Surplus Electronics via Ebay.

Mike

________________________________

From: ukmicrowaves@...
[mailto:ukmicrowaves@...]
On Behalf Of gm4plm
Sent: 23 May 2006 08:43
To: ukmicrowaves@...
Subject: [ukmicrowaves] contact details for Taurus Electronics (??)


Guys

does anyone have the contact details for taurus electronics

I think these were the guys selling the 24g link gear at the
rallies??

rgds

Simon


Re: contact details for Taurus Electronics (??)

Willis, MJ &#92;(Michael&#92;) <m.j.willis@...>
 

Try Sinequanon Surplus Electronics via Ebay.
 
Mike


From: ukmicrowaves@... [mailto:ukmicrowaves@...] On Behalf Of gm4plm
Sent: 23 May 2006 08:43
To: ukmicrowaves@...
Subject: [ukmicrowaves] contact details for Taurus Electronics (??)

Guys

does anyone have the contact details for taurus electronics

I think these were the guys selling the 24g link gear at the rallies??

rgds

Simon


contact details for Taurus Electronics (??)

gm4plm <simon@...>
 

Guys

does anyone have the contact details for taurus electronics

I think these were the guys selling the 24g link gear at the rallies??

rgds

Simon


Re: contact details for Taurus Electronics (??)

geoffg7rmg@...
 

Charles on 01509 646822
  73 's Geoff M0RMG


sky dish

corbrae <bob@...>
 

Hi
I would be interested in anyone using a 'sky' type dish on 3cms that
is one 50cms wide and 40cms high details of thier findings re feed
horn etc at present I am using the original.
Regards
Bob


Re: dmc 24g tvtrs??

gm4plm <simon@...>
 

If anyone else has a unused DMC case I would glas to hear from you!

Andy GM7GDE (now DL5KAH) is going to use my old WGD 10g system from
his home QTH in Düsseldorf

So another case would not go amiss to help him

he has my old wdg system and we just got him a 1w pa so he will be a
newcomer on the band!

rgds

Simon DL4PLM/GM4PLM/PA4...... !






--- In ukmicrowaves@..., "gm4plm" <simon@...> wrote:

what was the name of the company in Burton(?) that sold the 24g
parts??

I am looking for the case that houses these

does anyone have a spare DMC unit they have ripped all the parts
out??

rgds

Simon Dl4PLM


Re: Microwave SDR Group

Jonathan Naylor <naylorjs@...>
 

We wouldn't rule out a USB interface in the long term, but we've set
our sights on Ethernet as we feel is does the best job all round.
There is such a thing as Power over Ethernet (PoE) which can handle
more power than a USB port, 15W I think, and we will look into that in
due course also.

I've certainly used USB to Ethernet adapters and they work very well.
We are using 100baseT, not 10baseT due to bandwidth requirements.

I'm not sure that a web interface is suitable for a weak signal radio,
maybe with AJAX it would be usable, but we're not going there yet. The
PC end has to be a thick client as that is where the DSP is done, and
even with a web front end, there is still significant processing
behind the scenes.

I am thinking in the long term that we could split the GUI
functionality and the DSP part and use IP for that too. The audio
could be decimated/interpolated to 8 KHz sample rate which would
reduce the bandwidth requirements considerably, but that would be
after the DSP. There is at least one amateur operating remotely such a
station, in fact across national boundaries!

Just imagine a remote shack on a mountain ......

Jonathan ON/G4KLX (G4KLX from Wednesday PM for a few days)


Re: Microwave SDR Group

David Lewis <g8jxa.radio@...>
 

Some comments

Ethernet V. USB
The IP address (lack of) problem in a company network. You can use a
USB to Ethernet adaptor to turn the Ethernet port into USB;
www.amazon.co.uk/exec/obidos/ASIN/B0002AFKN0/026-1538281-3316427
No need to beg an IP address.

Ethernet is OS agnostic.

Ethernet cable can be 200m long, USB is good for 5m.

Lack of Ethernet power, could still use the USB port for power only
(as in the SoftRock).

Bandwidth for ATV, at home run Freeview TV over Ethernet and Wi-Fi
every day without any problem, so don't think it will be an issue.

Ethernet also supports remote operation.

GUI
The colour scheme can be changed, a good example is Ham Radio Deluxe
that supports high contrast colour schemes.

Using Ethernet and a mini Webserver a new GUI design could be 30
minutes with an HTML editor.

--- In ukmicrowaves@..., "Willis, MJ &#92;(Michael&#92;)"
<m.j.willis@...> wrote:



________________________________

From: ukmicrowaves@...
[mailto:ukmicrowaves@...]
On Behalf Of Jonathan Naylor
Sent: 15 May 2006 09:47
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: Microwave SDR Group


Hi Mike

I still think USB2 is a better interface for use in the field but
I
understand why you went for Ethernet.
I would disagree on this point. We want to be able to support the
software on multiple platforms and USB is painful to program to. The
socket interface is standard, has adequate bandwidth and allows for
stacking of multiple radios easily.

That is true, but the real problem is bandwidth. I guess for this
application, Ethernet is OK, for DATV I doubt it could keep up.

Hardware - modular is the way to go. I think you can do better
than
200mW and 3 dB NF but I suspect this is merely the back end to a
low
noise amplifier and a driver for the high power amplifier.
Correct. Most microwave operators are familiar with system design in
terms of components, and by keeping the output power low, and the
receiver average, we keep the price low, the design easily
reproducable, and enough to drive most amplifiers. We still want to
keep a market open for DB6NT don't we? :-)

Can you add 70cms to the front end list? I don't man as a rig for
the
band, just as a nice band to use for a transverter IF for those
of us
with transverters already.
It has been talked about. If someone were to come forward and
design a
front end, it might arrive even quicker. The constraints on design
are
not bad, the local oscillator must be clean BUT it does not need to
tune in 1Hz steps, the DSP can interpolate, and so on. Why not have
a
go Mike?

I don't have enough info, but is it not almost the same as 23cms?
Divide
the LO by 3?
I agree 1 Hz steps are not needed at all, if you have 100kHz of
bandwidth in I and Q 10kHz steps should do nicely.
More controversy, why does the LO need to be highly stable at all?
Why
can you not use a DDS to generate a "dirty" signal, multiply this
up to
act as an in band beacon and and have a cleaner LO frequency locked
to
it by the software every so often. All the LO filtering is then
done by
DSP and it does not matter that the DDS spurs are only 40 dB down.
As
long as the clean LO does not drift too much this should be OK. You
could reset it each second for example. A clean LO could be a
crystal
source like that from the IC202S multiplied up. That circuit manages
200kHz range at 144MHz with very low phase noise. Translating that
up
either by multiplication or by mixing should give an LO with good
short
term stability, reasonable and correctable drift.

Whatever Gui interface you design, it needs to be usable with a
laptop
on a hilltop when you can't see the screen very well. The current
picture on the web page looks great but would be almost
impossible to
use in a field.
What makes you say that? There is no easy design for GUIs that will
suit all people, so by keeping it simple and going with a design
that
echoes the IC-706 I have hopefully meant that the least number of
people will find annoying/unusable.

What I mean is that the screen needs a very high contrast colour
scheme
and relatively large figures.
You could make this configurable. For example, grey buttons on a
grey
background are not easy to see when there is sun on the screen.
This is
the windows default. It might be that you are using windows default
calls so that changes made in the settings would come thorough, but
realistically, a high contract colour scheme is not a bad idea. The
latest Anristu and Agilent test gear with LCD displays does this so
there must be a demand.

Mike





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________________________________


Re: dmc 24g tvtrs??

gm4plm <simon@...>
 

just the box

im working on putting my 3,4g tvr and SSPA in it!

so just need an idea of dimensions internally

tks



--- In ukmicrowaves@..., <g8zha@...> wrote:

It is all stripped out. I chucked the bits away, they were from a
7GHz link.
Did you just want the box?

Rich
----- Original Message -----
From: "gm4plm" <simon@...>
To: <ukmicrowaves@...>
Sent: Sunday, May 21, 2006 10:30 PM
Subject: [ukmicrowaves] Re: dmc 24g tvtrs??



Rich thats fine!

im happy to carry the post

do you have a pic of the internals?

rgds

Simon



--- In ukmicrowaves@..., <g8zha@> wrote:

I have got one of the cast ally cases that housed a DMC duplicated
ODU. Its
a bit heavy though....postage will be expensive from Westmids.

Regards, Rich



----- Original Message -----
From: "gm4plm" <simon@>
To: <ukmicrowaves@...>
Sent: Sunday, May 21, 2006 10:12 PM
Subject: [ukmicrowaves] dmc 24g tvtrs??


what was the name of the company in Burton(?) that sold the 24g
parts??

I am looking for the case that houses these

does anyone have a spare DMC unit they have ripped all the parts
out??

rgds

Simon Dl4PLM







Yahoo! Groups Links













Yahoo! Groups Links


Re: dmc 24g tvtrs??

g8zha@...
 

It is all stripped out. I chucked the bits away, they were from a 7GHz link.
Did you just want the box?

Rich

----- Original Message -----
From: "gm4plm" <simon@...>
To: <ukmicrowaves@...>
Sent: Sunday, May 21, 2006 10:30 PM
Subject: [ukmicrowaves] Re: dmc 24g tvtrs??



Rich thats fine!

im happy to carry the post

do you have a pic of the internals?

rgds

Simon



--- In ukmicrowaves@..., <g8zha@...> wrote:

I have got one of the cast ally cases that housed a DMC duplicated
ODU. Its
a bit heavy though....postage will be expensive from Westmids.

Regards, Rich



----- Original Message -----
From: "gm4plm" <simon@...>
To: <ukmicrowaves@...>
Sent: Sunday, May 21, 2006 10:12 PM
Subject: [ukmicrowaves] dmc 24g tvtrs??


what was the name of the company in Burton(?) that sold the 24g
parts??

I am looking for the case that houses these

does anyone have a spare DMC unit they have ripped all the parts
out??

rgds

Simon Dl4PLM







Yahoo! Groups Links













Yahoo! Groups Links


Re: dmc 24g tvtrs??

gm4plm <simon@...>
 

Rich thats fine!

im happy to carry the post

do you have a pic of the internals?

rgds

Simon



--- In ukmicrowaves@..., <g8zha@...> wrote:

I have got one of the cast ally cases that housed a DMC duplicated
ODU. Its
a bit heavy though....postage will be expensive from Westmids.

Regards, Rich



----- Original Message -----
From: "gm4plm" <simon@...>
To: <ukmicrowaves@...>
Sent: Sunday, May 21, 2006 10:12 PM
Subject: [ukmicrowaves] dmc 24g tvtrs??


what was the name of the company in Burton(?) that sold the 24g
parts??

I am looking for the case that houses these

does anyone have a spare DMC unit they have ripped all the parts
out??

rgds

Simon Dl4PLM







Yahoo! Groups Links







Re: dmc 24g tvtrs??

g8zha@...
 

I have got one of the cast ally cases that housed a DMC duplicated ODU. Its
a bit heavy though....postage will be expensive from Westmids.

Regards, Rich

----- Original Message -----
From: "gm4plm" <simon@...>
To: <ukmicrowaves@...>
Sent: Sunday, May 21, 2006 10:12 PM
Subject: [ukmicrowaves] dmc 24g tvtrs??


what was the name of the company in Burton(?) that sold the 24g parts??

I am looking for the case that houses these

does anyone have a spare DMC unit they have ripped all the parts out??

rgds

Simon Dl4PLM







Yahoo! Groups Links







dmc 24g tvtrs??

gm4plm <simon@...>
 

what was the name of the company in Burton(?) that sold the 24g parts??

I am looking for the case that houses these

does anyone have a spare DMC unit they have ripped all the parts out??

rgds

Simon Dl4PLM


Modifying DXR700 units for 6cm - a progress report

Chris Bartram <yahoo@...>
 

A few months ago I promised to put-up modification data for these units, which
are available very cheaply from New Zealand. I still haven't finished all the
work, but all other things being equal, it shouldn't take that much longer.

If anyone is sitting on one of these units waiting with baited breath, your
wait is nearly at an end!! Here's a brief report.

I have the receiver/local oscillator working quite nicely with about 3dB ssb
noise figure. The image reject mixer could really do with a 90degree hybrid
covering 144MHz in its IF path, but even with the 70MHz unit originally
fitted, the image is about -12dB, which is enough to give nearly
single-sideband noise performance. Used with a suitable filter and preamp
ahead of it, it will be fine.

The synthesised local oscillator is quite T9, with spurious FM being well
below 20Hz p-p. The noise at 10kHz offset is about -80dBc/Hz, a bit worse
than a typical crystal oscillator-frequency multiplier strip, but not awful.
The synthesiser has a simple single transistor oscillator operating at
1872MHz with a relatively low-Q microstrip on glass-teflon substrate
resonator. A properly designed 3D cavity resonator oscillator could give
better performance than a multiplier strip, but unless you live in 6cm QRM
Alley, it's probably not worth the hassle, as it will only effect the
adjacent channel performance!

With a good (1ppm Rakon, I think) TCXO, the frequency stability is rather
better than average amateur transverters. It would be a trivial matter to
drive the synthesiser from an external 10MHz reference if you wanted higher
stability.

My next job is to modify the transmitter board. That shouldn't take too long.
I then intend to design filters both transmitter and receiver - modifiable
units are available from NZ, but I have an ulterior motive and I also like
doing things the hard way...

I brought two of these units. One will shortly become my 6cm transverter. The
other will be split: the transmitter will become a 5760.100MHz personal
beacon, and the receiver will form part of a simple microwave spectrometer
which I'll use to look for methanol masers, associated with star formation,
in the 6 - 6.7GHz region when I'm not using my dish for EME.

Not bad for around £30...

Vy 73

Chris
GW4DGU


IEEE-488 converter.

Alan Melia
 

Hi Andy I seem to recollect that there is a slightly more complicated
protocol when you start up. As an aside I remember not being able to get one
of the old Commador PET computers to run with a "proper HPIB" because the
HPIB controller sent ATTN, My Listen Address is, and this succeeded in
totally locking up the Commadore ( which used a subset of the GPIB) for a
timeout period. If you can't crack it I have a Racal portable IEEE-488 bus
analyser you may borrow ( I also have a Logic Analyser with A GPIB
personality card so I wont be lost, even if I do get round the oft put-off
project of controlling some of my test gear. )

I did check a 1998 RS catalogue and your interface wasnt in. I do have a lot
of old CD catalogues and data sheets if you can quote an RS order code.

Cheers de Alan G3NYK