[amsat-bb] IC9700 Update

Sun Feb 10 18:53:00 UTC 2019

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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> >>
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