Hi Rick,
The numbers for the models seem very optimistic. Normal gain for J-pole
(theoretical) can not be more than a dipole, since the antennas is an
end fed dipole with the Q section for matching. This means at most
2.14 dBi, but maybe you are experiencing some ground gain which you can
Judy and I did further testing of 1/4 wave and 5/8 wave antennas for 2
meters on her vehicle using the ICOM IC-7000 at 50 watts out. The base
station continued to be the 30 foot high homebrew J-pole and now has 100
watts out from the ICOM 746 Pro. The mobile antennas were only mag
mounts, but
Skip,
Realistically, the 5/8 wave will be maybe around the gain of a dipole. I
would use 2 dBi, maybe 3 dBi at the most. I don't think there are any
5/8 wave verticals that can do much better than that and some antenna
gurus point out that they can perform worse than half wave antennas. I
Rick,
Skip,
Realistically, the 5/8 wave will be maybe around the gain of a dipole. I
would use 2 dBi, maybe 3 dBi at the most. I don't think there are any
5/8 wave verticals that can do much better than that and some antenna
gurus point out that they can perform worse than half wave
Hi Skip,
The numbers for the models seem very optimistic. Normal gain for J-pole
(theoretical) can not be more than a dipole, since the antennas is an
end fed dipole with the Q section for matching. This means at most
2.14 dBi, but maybe you are experiencing some ground gain which you can
get
Hi Rick,
Have you found that DominoEX is the best overall digital mode for FM? I
know that PSK modes can have doppler errors from aircraft, but otherwise
seem pretty good for weak signal.
Yes, definitely! DominoEx is a frequency shift keying mode, not a phase
shift mode, but doppler problems
Regarding horizontal antennas... they also have a big advantage in
rejecting intermod due to being cross-polarized with most commercial
services...
--- In digitalradio@yahoogroups.com, Rick W [EMAIL PROTECTED] wrote:
Skip,
Have you found that DominoEX is the best overall digital mode for
Very good information, Skip,
If the signals are in the marginal range, how do you do the coordinating
between the stations?
How do you calculate the error rate (such as the 6% mentioned)?
If I understand this correctly, the test was between a 5/8 vertical to
quad for vertical polarization vs.
If the signals are in the marginal range, how do you do the coordinating
between the stations? To date, we have been able to use a cell phone.
How do you calculate the error rate (such as the 6% mentioned)?
We send 50eroids.(..). Anything
that is
27, 2008 8:19 PM
Subject: Re: [digitalradio] Re: How Can We Push HF Emcomm Messages to the
Field?
If the signals are in the marginal range, how do you do the coordinating
between the stations? To date, we have been able to use a cell phone.
How do you calculate the error rate (such as the 6
@yahoogroups.com
Sent: Tuesday, November 25, 2008 6:58 PM
Subject: [digitalradio] Re: How Can We Push HF Emcomm Messages to
the Field?
Is the volunteer out of VHF range?
If the base station has a 100 watt VHF radio like the 746pro - you
might be able to still reach the volunteer, but he may
Hi Howard,
If you respond to someone's response to a question, with asking
questions of your own, then it might be reasonable for some to respond
as Skip did. It seems reasonable to me considering you asked Is the
volunteer out of VHF range? You also asked about setting up something
in the
]
To: digitalradio@yahoogroups.com
Sent: Wednesday, November 26, 2008 1:42 PM
Subject: [digitalradio] Re: How Can We Push HF Emcomm Messages to the Field?
SKIP SKIP SKIP
READ READ READ
I, HOWARD, AM not not NOT NOT not THE PERSON WITH THE QUESTION NOR
THE PROBLEM.
GEEZ, I TRY TO ANSWER SOMEONE'S QUESTION
: [digitalradio] Re: How Can We Push HF Emcomm Messages to the
Field?
Hi Howard,
If you respond to someone's response to a question, with asking
questions of your own, then it might be reasonable for some to respond
as Skip did. It seems reasonable to me considering you asked
In this county you can sum up the biggest problem in
one word manpower. Within my zip code there is
3 hams living in town.
One is up in the years and has not been on the air in
years as well as to weak to do much.
As far as the other 2, one is chief of police. The other
is #2 in command on
typing, my vision is not good today and I'm a hunt 'n peck typist.
73 DE Charles Brabham, N5PVL
- Original Message -
From: John Becker, WØJAB
To: digitalradio@yahoogroups.com
Sent: Wednesday, November 26, 2008 4:41 PM
Subject: Re: [digitalradio] Re: How Can We Push HF Emcomm
I deleted that posting soon after I made it.
However, I suppose those who get emails still got it.
My posting was not appropriate.
I appologize.
Howard
Message -
From: Howard Z. [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Wednesday, November 26, 2008 6:32 PM
Subject: [digitalradio] Re: How Can We Push HF Emcomm Messages to the Field?
I deleted that posting soon after I made it.
However, I suppose those who get emails still got
I deleted the posting a few minutes after I made it.
I realized it was inappropriate.
I somehow felt I was being challenged to a debate,
All I did was give someone my 2 cents,
and dozens of others would also likely give their opinions.
I don't know why, but I reacted badly to the post directed
Yes indeed - I have found that nothing on HF is reliable 24/7.
One can not reliably reach another country at will regardless of
equipment.
Local NVIS operation also has problems.
In my MARS group before DST ended, conditions were pretty bad
because we started before sunrise - and then
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Charles Brabham
Sent: Wednesday, November 26, 2008 6:22 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: How Can We Push HF Emcomm Messages to the
Field?
One obvious choice
Skip,
Have you found that DominoEX is the best overall digital mode for FM? I
know that PSK modes can have doppler errors from aircraft, but otherwise
seem pretty good for weak signal.
Your point is well taken that many of the hams who participate in public
service activities, may tend to be
Is the volunteer out of VHF range?
If the base station has a 100 watt VHF radio like the 746pro - you
might be able to still reach the volunteer, but he may not have
enough power to get back to you.
Or he may be out of VHF range.
HF is the way to go - but both ends of the conversation need
. It'll be interesting to
see how they do.
73, Bob, KD7NM
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Howard Z.
Sent: Tuesday, November 25, 2008 3:59 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: How Can We Push HF Emcomm
@yahoogroups.com
Sent: Tuesday, November 25, 2008 6:58 PM
Subject: [digitalradio] Re: How Can We Push HF Emcomm Messages to the Field?
Is the volunteer out of VHF range?
If the base station has a 100 watt VHF radio like the 746pro - you
might be able to still reach the volunteer, but he may not have
enough
Subject: [digitalradio] Re: How Can We Push HF Emcomm Messages to the
Field?
Is the volunteer out of VHF range?
If the base station has a 100 watt VHF radio like the 746pro - you
might be able to still reach the volunteer, but he may not have
enough power to get back to you.
Or he may be out
planning are not yet all known, either.
Cortland
KA5S
AAR5UT
[Original Message]
From: Howard Z. [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Date: 11/25/2008 6:59:21 PM
Subject: [digitalradio] Re: How Can We Push HF Emcomm Messages to the
Field?
Is the volunteer out of VHF range
The last time I got into something like this I was called
(all be it direct reply) a fool.
What works for you in the large city may not work for me
in the rural area with hills all around.
In the floods this spring I at times had the only HF mobile
rig in the county.
PM
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] Re: How Can We Push HF Emcomm Messages to
the Field?
And further, this thought should be considered as VHF FM, or VHF SSB? In
a
base/mobile or mobile/mobile environment, SSB on VHF works over much
greater
distances.
With voice
This is something that would likely be more at home at the HFDEC
yahoogroup that discusses disaster and emergency communications but lets
look at some of the practical aspects.
Distance was not specified, but it would be rare to send someone out at
night, under dangerous conditions, in
30 matches
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