Re: [amsat-bb] IC9700 Update

10 Feb 2019

      At the risk of sounding like "My dad is stronger than your dad", here's my
experience.  I have two Astron Power Supplies which I bought in 1985.  They
still work like champs.
Rolf NR0T
On Sun, Feb 10, 2019, 12:57 PM Paul Stoetzer n8hm@arrl.net wrote:
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My RS-35M has served me well for nearly 19 years, so I'll add to that
recommendation.
73,
Paul, N8HM
On Sun, Feb 10, 2019 at 1:28 PM Jim Sanford wb4gcs@wb4gcs.org wrote:
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I have several RS35Ms and they have been trouble-free.
AFter an ARRL review several years back, I tried an SS-30.  (The Astrons
were significantly quieter than anything else that they tested.)  No RF
noise that I could detect.  That said, I have not put a scope on the DC
lines, but will when I get a chance.
I have bought several more SS-30s and had no noise problem with them.
So, for Field Day and PA QSO Party, I carry a switcher. (Weight!!)
Good luck & very 73,
Jim
wb4gcs@amsat.org
On 2/10/2019 1:16 PM, Bob Hammond wrote:
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Thanks!  Astron it is.
Bob W7OTJ
On Sun, Feb 10, 2019 at 8:56 AM David J. Schmocker <
kj9idave@charter.net>
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wrote:
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Bob:
I echo Frank¹s good input.  I would append this with recommendation
to use
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a linear (not switching) Astron Power supply because they¹re
electrically
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quiet.  If your P/S needs to power the radio only, an Astron RS-35M
would
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be large enough.   On the other hand, if you also need to power other
devices (such as linear power amplifier), then you¹ll need to go
bigger or
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use multiple RS-35Ms, etc.    Remember the ratings on these P/Ss are
Intermittent Carrier as used in Amateur Service (ICAS) meaning 50%
(approx.) duty cycle.. Great for CW or SSB.  However for any full duty
cycle mode such as WSJT, FM? etc, then you need to derate the power
supply
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so it¹s capabilities are not exceeded.
Switch-mode Power Supplies (switching supplies or 'switchers¹) are
smaller
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and lighter weight with the trade-off that they generate electrical
noise
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(because of how they regulate the output level) and inherently are
noisy.
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Linear supplies are bigger and heavier (and less power-efficient) but
for
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those trades, one gets absolute electrical quiet performance because
they
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don¹t hot-switch power signals away from a zero-crossing.  If you
wish to
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see an animated Œhow switching power supplies work¹ video (approx. 14
minutes), here¹s one I share when explaining this concept.
https://www.youtube.com/watch?v=vwJYIorz_Aw
Very 73,
Dave KJ9I
On 2/10/19, 10:32 AM, "AMSAT-BB on behalf of Frank"
<amsat-bb-bounces@amsat.org on behalf of K6FW1@verizon.net> wrote:
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I have used Astron power supplies for years.  Pick the appropriate
current rating.
Frank
K6FW
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On Feb 10, 2019, at 7:15 AM, Bob Hammond propgrinder@gmail.com
wrote:
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I'm ready to order mine along with a power supply.  Any suggestions
on
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PS?
Bob W7OTJ
On Sat, Feb 9, 2019 at 8:21 PM Thomas Schaefer ny4i@ny4i.com
wrote:
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> FYI - When I ordered mine from DXEngineering (due to the
reservation I
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> placed), they said if the price drops from the $2098 before it
ships,
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> it
> will sell for the lower price. That also do not charge one¹s credit
> card
> until it ships.
>
> Tom NY4I
>
>> On Feb 9, 2019, at 9:44 PM, radiomb radiomb@bellsouth.net
wrote:
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>>   Just purchased a IC9700 today at Hamcation. It was great to see
one
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>> in
> person. I got it for $1995. Icom said all back orders should be
filled
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> by
> end of April. They said they should have enough in stock so that
anyone
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> that wants one at Dayton can get it. I was happy to get it for
$1995.
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> No
> tax or shipping.
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Re: [amsat-bb] IC9700 Update

Rolf Krogstad