Yes, I understand that the 2-5 per second rate is for receiving, but
you presumably must retune when switching from one band to another.
If the tuner takes 500ms to retrieve its settings, how do you
accomplish a 5 per second rate?
A low fan dipole might give you good local multiband coverage without
the need for a tuner. You can make one out of multi-conductor rotator
cable.
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, "Harold Aaron" <[EMAIL PROTECTED]>
wrote:
>
> Hi Dave, Most of the 2-5 per second is receiving remember. The LDG
> AT-200PC computer-controlled tuner is pretty much the accepted
standard for
> MARS-ALE, and support is built-in the program. You pre-tune the
frequencies
> you will be transmitting on, and store the setting for each freq.
When
> actually transmitting, the recall is near instantaneous as long as
you did a
> solid tune before. There may be a 1/2 second delay as the tuner
retrieves
> the settings.
>
> I use a 468' NVIS dipole for MARS-ALE (about 10-12 ft/. above
ground with
> two parallel wire reflectors along the ground, and have recently
been using
> it on regular nets just above 80 meters. Any regular antenna I try
to use
> (Alpha-Delta off-center fed dipole) is just destroyed by
atmospheric noise
> as we pretty much always have storms in the area during the late
afternoon.
> On the nets I just crank the power up a bit (30-40 watts using ALE,
100
> -200w SSB) and it offsets the reduced transmitted signal level
caused by the
> NVIS. It sure does tame the noise to an acceptable level though.
>
> Best,
>
> Hank
> KI4MF
> NN0BBX
>
> _____
>
> From: digitalradio@yahoogroups.com
[mailto:[EMAIL PROTECTED] On
> Behalf Of Dave Bernstein
> Sent: Saturday, August 26, 2006 3:20 PM
> To: digitalradio@yahoogroups.com
> Subject: [digitalradio] Re: Open 5066 for HF-based Digital Email,
Emergency
> Data
>
>
>
> --- In digitalradio@ <mailto:digitalradio%40yahoogroups.com>
> yahoogroups.com, Steve Hajducek <shajducek@>
> wrote:
>
> >snip<
>
> > >The ALE antenna issue is a major one for either portable or
fixed
> though.
>
> How's that?
>
> I have a NVIS antenna that above that range starts to look like a
> random wire with gain that is a 125 foot dipole make of brightly
> jacketed 14ga. wire (could be lesser gauge) that mounted 6 feet
above
> ground, easy to do just about anywhere, easy to make very visible.
> From the center of that 125 foot dipole span is 28 feet for 300 ohm
> twin led that raises to 10 feet above ground at which point is hung
a
> CWS ByteMark 6:1 balum with a heavy earth ground and from there 50
> ohm coax to the transceiver, over the soil in my backyard this
> antenna mounted as described is resonant at 3.2Mhz, the LDG AT200PC
> tunes it from 2Mhz (and lower) to 27Mhz (and higher) with ease for
my
> MARS channels in use. It is basically a full 160-6m antenna with an
> HF-6m radio like my FT-817 and FT-847 and the AT200PC ATU. This
> antenna rolls up nicely and fits in a back backpack, if you are
lucky
> enough to just suspend it from trees etc in your target surrounds
> then poles are not even needed, just dacron rope, although I have
> various push up and intersecting poles for use as needed. There are
> even screw together ground rods these days, although I just lug an
8
> footer about.
>
> >>>The point is that you need a multi-band antenna. If the ALE scan
> rate is 2-5 frequencies per second, then presumably you need an in-
> board or out-board auto-tuner capable of retuning that rapidly if
the
> frequencies lie on different bands, correct?
>
> 73,
>
> Dave, AA6YQ
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
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