Diamond V2000
Peter Watts
Just bought the above and have a problem with it. Wondered if anyone else
has the same antenna could help. Finding the SWR is higher than I would like
on 2m...6m and 70cms are fine. Found a review on eHam where the writer
describes exactly the same SWR curve as the one I am getting, about 2 at the
top of 2m dropping to 1.4ish at the bottom. Studied the documentation that
comes with it (comprising a pigeon English A4 sheet of instructions and
another
with diagram annotated in Japanese!) and think its trying to say I should of
used
some sort of connector when I slide the top and bottom halves of the white
stick
together. Remember a copper rod protruding from the top section and seeing
a hole in the bottom half that appeared to be ready to receive it. Don't
remember
seeing any means of hard connecting the two halves of the inner together, I
simply
sleeved one inside the other and then tightened the silver ring on the
outside.
Any ideas anyone?
Many Thanks in advance.
Pete
P.R.J. Shayler
Peter Watts <g0...@NOSPAMbigfoot.com> wrote:
> Hi, Just bought the above and have a problem with it. Wondered if anyone
> else has the same antenna could help. Finding the SWR is higher than I
> would like on 2m...6m and 70cms are fine. Found a review on eHam where
> the writer describes exactly the same SWR curve as the one I am getting,
> about 2 at the top of 2m dropping to 1.4ish at the bottom.
AFAIK, the V2000 should cover 144 - 148MHz, so you should have a lower
VSWR at 145.950MHZ than at 144.025MHz.
> Studied the
> documentation that comes with it (comprising a pigeon English A4 sheet
> of instructions and another with diagram annotated in Japanese!) and
> think its trying to say I should of used some sort of connector when I
> slide the top and bottom halves of the white stick together. Remember a
> copper rod protruding from the top section and seeing a hole in the
> bottom half that appeared to be ready to receive it. Don't remember
> seeing any means of hard connecting the two halves of the inner
> together, I simply sleeved one inside the other and then tightened the
> silver ring on the outside. Any ideas anyone?
There is a method of connecting the two parts of the "metalwork" together,
by some grub screws AFAIK, it's a very long time since I put my V2000 up.
Seasons Greetings de Paul G6TSF & M3???
--
I'm using a Risc PC (tm) with SA-110 StrongARM (tm) RISC processor
and running RISC OS 4.02 (tm)
Paul G6TSF g6...@amsat.org g6...@arrl.net Active on APRS.
MattD..
news:4aeaeea...@g6tsf.demon.co.uk:
> There is a method of connecting the two parts of the "metalwork"
> together, by some grub screws AFAIK, it's a very long time since I put
> my V2000 up.
You're right. I had to replace the capacitors at the base of a friend's
aerial a few weeks ago, and to get the two sections apart, there are hex
grubscrews in a 'choc block' type connector without the plastic coating,
which hold the two sections together. If you can't see it, you need to undo
the grubscrews holding the SO-239 connector in place and push the SO-239 up
into the main body of the aerial. Once you've made good and fast the
connection, push the whole lot back down again and secure the SO-239 in place
*firmly*. I have seen no end of V-2000s with instability in even moderate
winds, and more importantly generating spurii due to a poor electrical
connection here.
Good luck.
MattD..
GW0VNR
Ian Brooks
<pa...@g6tsf.demon.co.uk> wrote:
>
>There is a method of connecting the two parts of the "metalwork" together,
>by some grub screws AFAIK, it's a very long time since I put my V2000 up.
>
Look at www.rfparts.com/diamond/v2000tech.html
This has the assembly instructions and diagrams showing the 'element
coupler'
Ian
G1RVK
Ian Brooks
>You're right. I had to replace the capacitors at the base of a friend's
>aerial a few weeks ago,........etc.
>
>MattD..
>GW0VNR
Matt,
What caused the caps to fail? Too much fwd power?
What value are the capacitors? I have one of these aerials and would
like to know for future reference, just in case.
Thanks,
Ian.
G1RVK
MattD..
@news.virgin.net:
> Matt,
> What caused the caps to fail? Too much fwd power?
A rather close lightning event. Not a direct strike, but enough voltage was
induced to completely detroy one capacitor. The other two were replaced on
suspicion.
> What value are the capacitors? I have one of these aerials and would
> like to know for future reference, just in case.
They are 18, 18 and 33pF ground to element respectively, but take note they
are 300V rated articles and not just your average ceramic discs. The values
are clearly marked on the devices, so identification is easy.
--
MattD..
GW0VNR
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Ian Brooks
>A rather close lightning event. Not a direct strike, but enough voltage was
>induced to completely detroy one capacitor. The other two were replaced on
>suspicion.
>They are 18, 18 and 33pF ground to element respectively, but take note they
>are 300V rated articles and not just your average ceramic discs. The values
>are clearly marked on the devices, so identification is easy.
Thanks for the info. All filed away, though hopefully won't need it.
The last Diamond aerial I bought was in 1985, all metal, 5/8 over 5/8,
still going strong. Hope this white carbon fibre? thing lasts as well.
Ian.
G1RVK.
MattD..
> Thanks for the info. All filed away, though hopefully won't need it.
> The last Diamond aerial I bought was in 1985, all metal, 5/8 over 5/8,
> still going strong. Hope this white carbon fibre? thing lasts as well.
GRP, actually. Carbon fibre would be conductive and would alter the tuning,
not to mention being a pretty effective screen :o)