[Dstar] D-Star: VK3RWN RF SYSTEM DIAGRAM

[Richard Hoskin]

Will and Steve,

 

Thanks for working on the diagrams they are great.

 

Cheers

Richard

VK3JFK

 

  _____  

From: dstar-bounces at lists.wia.org.au [mailto:dstar-bounces at lists.wia.org.au]
On Behalf Of will2 at iinet.net.au
Sent: Thursday, 13 December 2007 5:23 PM
To: will2 at iinet.net.au; Dstar Digital Radio Mail List; Steve Reining
Subject: Re: [Dstar] D-Star: VK3RWN RF SYSTEM DIAGRAM

 

Thanks Steve,

For the amended diagram much apreciated.
Even dressed up our little pussy cat....

Very early days in VK6 but looking good with
considerable interest. A new site has been found
and we are getting the gear together.

My D-star radio (800) has finally turned up, it
took almost a month and I was told ICOM are
having trouble with supply, so looks good for ICOM.

Have not had a D-star QSO yet but have had a look
at the signal on a spec analyser (attached) for those who
have not seen it. Looks no different than a narrow band
FM signal and is the same regardless of audio or not.

Will
VK6UU



On Thu Dec 13 12:07 , Steve Reining sent:

Hi Will

See attached RF SYSTEM diagram, i have amended it accordingly

Regards Steve VK3JSR

At 12:20 PM 13/12/2007, you wrote:



Hello Richard,

Thank you for the on going updates they are appreciated.

When time permits would it be possible to provide greater detail as to the
RF
side of how the system was put together. In particular parts like isolators
and the 23cm duplexer. Most of the RF side of things I have considerable
experience with but can always learn more.

Also a picture of the antennas

I put together a simple block diagram of the RF part of VK3RWN from the
info you sent and wondered how accurate it is. Diagram attached.

Will
VK6UU



On Wed Dec 12 17:07 , "Richard Hoskin" sent:



Hello,

Here is the latest news for VK3RWN.

23cm DV

The diplexer was installed today for the 23cm Digital Voice repeater. 23cm

DV will be turned on this evening for testing and general use.

We are very interested in hearing coverage and performance reports from all

stations using the 23cm D-Star repeater. Would you please provide feed back

of your experiences to this email list.

Note that the LDF 4/50 coax to the 23cm voice antenna is going to be

replaced with brand new LDF 5/50 donated by AARadio in the near future.

2mtr Tx Antenna

After testing late last week it was found that the new 2mtr tx antenna was

not performing as well as expected. So today Steve VK3JSR revisited the site

to run some diagnostics on the antenna. Steve found that the 2mtr tx

antenna's phasing harness was full of water.

Steve replaced and tested the phasing harness and dipoles. The tests showed

an improvement in the transmitter's performance however it looks as though

there is a small problem with the SWR of the phasing harness in the 2mtr

band. This means that the new phasing harness will need to be replaced

(again) in the near future to get the system up to a full operational

standard.

70cm Receiver Sensitivity

We are currently investigation issues with the 70cm receiver sensitivity as

it seems to be lower than expected. Today the cavities and multi-coupler for

70cm were checked and re-tuned. This gained us an extra 3db or so for the

receiving antenna system. However the receiver sensitivity is still down so

we will need to do more investigation with the 70cm repeater module.

Thanks goes to Steve, VK3JSR for the continuing commitment and hard work in

supporting the D-Star RF system. Thanks also to JRD Communications for their

support and assistance with the antennas and site access.

The "/" Slash routing issue.

Most of us have had limited success with using the Slash to call remote

gateway ports (Port Linking). This problem with the Slash is also being

experienced in the UK and Europe.

The reason for the problem with the Slash is not yet know however we are

continuing to gather data and feed it back to the US K5TIT group for

analysis. Until we get to the bottom of the problem be aware that using Port

Linking ie setting UrCALL to something like /VK8RADC may not work.

Cheers

Richard

VK3JFK


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