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:
Thanks! Astron it is.
Bob W7OTJ
On Sun, Feb 10, 2019 at 8:56 AM David J. Schmocker kj9idave@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@amsat.org on behalf of K6FW1@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@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@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@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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