[amsat-bb] IC9700 Update

[David J. Schmocker]

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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>_______________________________________________
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>are solely those of the author, and do not reflect the official views of
>AMSAT-NA.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
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