[Dstar] DSTAR DX?

[Richard Hoskin]

>From experience over the past few years I've found that DV will generally
out perform FM by between 6db to 9db depending on the situation.

 

Last year VK3TQ and I did some simplex tests between a mobile and portable
station. I was mobile in Malmsbury on the north side of the divide. Peter
was portable with a beam on the roof of the car in Frankston. The distance
was over 125Kms and we were both using IC-2820s on 2mtrs. We switch from DV
to FM and lost contact. Switching back to DV we able to talk to each other
again.

 

My QTH is 120km away from VK3RWN in a valley north of the divide. I can work
VK3RWN 2mtrs most of the time using my IC92 HH hooked up to the diamond
external antenna. I don't always have the same success with VK3REC which is
running on the same antenna system. (From memory D-Star TX has about 12W
into the antenna and FM TX has about 22W into the antenna)

 

The same DV performance gains have been observed in the commercial world.
Companies using systems such as IDAS (Icoms commercial digital system) have
observed 15% to 25% better performance over the equivalent FM system.

 

This all shows that in most situations DV (D-Star) performs better than the
equivalent FM system.

 

It would be great to have D-Star operational in the next Field day.

 

Cheers

Richard

VK3JFK

 

 

  _____  

From: dstar-bounces at lists.wia.org.au [mailto:dstar-bounces at lists.wia.org.au]
On Behalf Of Matt
Sent: Sunday, 21 June 2009 11:11 PM
To: Dstar Digital Radio Mail List
Subject: Re: [Dstar] DSTAR DX?

 

OK, thanks for that, in that case it appears that it is possible that D-STAR
repeaters have better range. My experience with D-STAR simplex matches this
- when analogue (FM) was used over a difficult signal path, comms were
unusable between a mate and myself - yet when we went to D-STAR, we had good
workable comms.

 

 

Matt

VK8GMT/2

----- Original Message ----- 

From: David Tilson <mailto:dave at daves-portal.com>  

To: Dstar <mailto:dstar at lists.wia.org.au>  Digital Radio Mail List 

Sent: Sunday, June 21, 2009 10:00 PM

Subject: RE: [Dstar] DSTAR DX?

 

Yes Matt, the analogue and D-STAR repeaters share the same antenna system.
The only difference between transmitters is that the analogue FM repeater
has a power output of approx 10W and the D-STAR repeater is approx 25W.

 

Regards,

 

davidt, VK3UR

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.wia.org.au/pipermail/dstar/attachments/20090621/0be9d06e/attachment-0001.html