[amsat-bb] IC9700 Update

Sun Feb 10 18:28:03 UTC 2019

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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