Search found 66 matches

by w9ac
Tue Jul 04, 2017 4:23 pm
Forum: Apache Labs News
Topic: Rob Sherwood, NCOB's Dayton Presentation
Replies: 4
Views: 4190

Re: Rob Sherwood, NCOB's Dayton Presentation

>"The 7300 and 7610 are shots across the bow of Kenwood and Yaesu." Very good points by Scott. We can add Elecraft to the above list. Certainly they have the wherewithal to develop DDC/DUC architecture, but why they haven't announced a product is a mystery to me. I was expecting an announc...
by w9ac
Fri May 05, 2017 2:12 am
Forum: Everything Else: Antennas, Relays, Switches, Power, Grounding, Cooling, etc.
Topic: Power Supply for 8000DLE
Replies: 11
Views: 6320

Re: Power Supply for 8000DLE

I'm using the RD Power 1KW supply. http://www.rdpower.net/ It's a quiet switcher, available in either 75A or 150A output current. Voltage is adjustable up to +14.5V. No APP connectors here: Both models use large, 1/4-inch brass bolts. I crimped ring terminals on the ends of the Apache-supplied power...
by w9ac
Wed May 03, 2017 8:55 pm
Forum: Network Connections & Network Hardware
Topic: NetGear Ethernet Switch Noise w/ 8000DLE
Replies: 6
Views: 4834

Re: NetGear Ethernet Switch Noise w/ 8000DLE

A bad ground point could be the culprit. The root source of the GS108 noise is likely a DC-DC switching converter. I had an RFI problem a while back from a Netgear home router that used a switching converter. My first attempt to quiet it down was through the use of a +12V linear supply feeding the r...
by w9ac
Wed May 03, 2017 2:54 pm
Forum: Network Connections & Network Hardware
Topic: NetGear Ethernet Switch Noise w/ 8000DLE
Replies: 6
Views: 4834

Re: NetGear Ethernet Switch Noise w/ 8000DLE

Okay, I swapped out the Netgear switch with an identical GS108 model and all is well. I guess something is defective with port 4 of the other Netgear switch. Interesting problem that lead me on quite a chase. I did not initially suspect the Netgear device to produce switching noise at regular interv...
by w9ac
Wed May 03, 2017 2:47 pm
Forum: Network Connections & Network Hardware
Topic: NetGear Ethernet Switch Noise w/ 8000DLE
Replies: 6
Views: 4834

NetGear Ethernet Switch Noise w/ 8000DLE

For the last day or so, I've been trying to trace a bizarre noise problem that occurs when the 8000DLE is operating. I am using an Icom 7300 and ANAN 200D for the noise display measurements. I finally localized the source to a Netgear Gigabit Ethernet switch. If the 8000DLE is plugged into Port 4 of...
by w9ac
Tue May 02, 2017 1:21 pm
Forum: PureSignal Operations (PowerSDR & Thetis)
Topic: Electronic bias systems vs. PureSignal
Replies: 18
Views: 9286

Re: Alpha 89 vs. PureSignal

The 89 doesn't ship with a full schematic, and there's no mention of the bias circuit in the manual; anyone with good knowledge on how to turn OFF this bias control, please chime in. I believe there are some other linear amps using bias control circuitry that may present similar complications for P...

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