[amsat-bb] IC9700 Update

Sun Feb 10 19:21:54 UTC 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 at arrl.net> wrote:

> 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 at wb4gcs.org> wrote:
> >
> > 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 at amsat.org
> >
> > On 2/10/2019 1:16 PM, Bob Hammond wrote:
> > > Thanks!  Astron it is.
> > >
> > > Bob W7OTJ
> > >
> > > On Sun, Feb 10, 2019 at 8:56 AM David J. Schmocker <
> kj9idave at charter.net>
> > > wrote:
> > >
> > >> Bob:
> > >> I echo Frank¹s good input.  I would append this with recommendation
> to use
> > >> a linear (not switching) Astron Power supply because they¹re
> electrically
> > >> quiet.  If your P/S needs to power the radio only, an Astron RS-35M
> would
> > >> 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
> > >> 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
> > >> so it¹s capabilities are not exceeded.
> > >> Switch-mode Power Supplies (switching supplies or 'switchers¹) are
> smaller
> > >> and lighter weight with the trade-off that they generate electrical
> noise
> > >> (because of how they regulate the output level) and inherently are
> noisy.
> > >> Linear supplies are bigger and heavier (and less power-efficient) but
> for
> > >> those trades, one gets absolute electrical quiet performance because
> they
> > >> don¹t hot-switch power signals away from a zero-crossing.  If you
> wish to
> > >> 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 at amsat.org on behalf of K6FW1 at verizon.net> wrote:
> > >>
> > >>> I have used Astron power supplies for years.  Pick the appropriate
> > >>> current rating.
> > >>>
> > >>> Frank
> > >>> K6FW
> > >>>
> > >>>> On Feb 10, 2019, at 7:15 AM, Bob Hammond <propgrinder at gmail.com>
> wrote:
> > >>>>
> > >>>> I'm ready to order mine along with a power supply.  Any suggestions
> on
> > >>>> PS?
> > >>>>
> > >>>> Bob W7OTJ
> > >>>>
> > >>>> On Sat, Feb 9, 2019 at 8:21 PM Thomas Schaefer <ny4i at ny4i.com>
> wrote:
> > >>>>
> > >>>>> FYI - When I ordered mine from DXEngineering (due to the
> reservation I
> > >>>>> placed), they said if the price drops from the $2098 before it
> ships,
> > >>>>> 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 at bellsouth.net>
> wrote:
> > >>>>>>
> > >>>>>>   Just purchased a IC9700 today at Hamcation. It was great to see
> one
> > >>>>>> in
> > >>>>> person. I got it for $1995. Icom said all back orders should be
> filled
> > >>>>> by
> > >>>>> end of April. They said they should have enough in stock so that
> anyone
> > >>>>> that wants one at Dayton can get it. I was happy to get it for
> $1995.
> > >>>>> No
> > >>>>> tax or shipping.
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