Search found 72 matches

by w9ac
Sun Oct 29, 2017 2:52 am
Forum: piHPSDR
Topic: Bluetooth Mouse and Keyboard Sluggish
Replies: 9
Views: 6060

Re: Bluetooth Mouse and Keyboard Sluggish

Fixed the Bluetooth mouse with this command placed at the end of /boot/cmdline.txt file:

usbhid.mousepoll=0

However, the keyboard suffers from the same problem after a period of inactivity and I don't see a fix for it.

Paul, W9AC
by w9ac
Sun Oct 29, 2017 2:17 am
Forum: piHPSDR
Topic: Bluetooth Mouse and Keyboard Sluggish
Replies: 9
Views: 6060

Bluetooth Mouse and Keyboard Sluggish

I'm using my Apache PiHPSDR with a Bluetooth keyboard and mouse. After 1-2 seconds of inactivity, it always takes another couple seconds for Bluetooth to wake up. I have to repeatedly move the mouse to get a response. Same with the Bluetooth keyboard. Clues?

Paul, W9AC
by w9ac
Tue Aug 01, 2017 11:35 am
Forum: PureSignal Operations (PowerSDR & Thetis)
Topic: Electronic bias systems vs. PureSignal
Replies: 18
Views: 10765

Re: Electronic bias systems vs. PureSignal

Chris, If your plan is to keep the Alpha 89 for awhile, you may want to keep a small stock of Tx PIN diodes. The Microsemi/MACOM UM4006D is the correct OEM part number for the 4-40 threaded stud version. Richardson RF is closing them out at $24.75 ea. This is much less than original OEM pricing and ...
by w9ac
Mon Jul 31, 2017 6:27 pm
Forum: PureSignal Operations (PowerSDR & Thetis)
Topic: Electronic bias systems vs. PureSignal
Replies: 18
Views: 10765

Re: Electronic bias systems vs. PureSignal

>"There seems to be several versions of the Alpha 89 out there. Mine is a 1994-vintage one (with the ETO logo) and has no dynamic bias manipulation..." Chris, Nice amp and I'm sure you enjoy using it. It's a shame that more of the 89 units weren't produced. As you point out, the 89 and 87A...
by w9ac
Sun Jul 30, 2017 7:16 pm
Forum: PureSignal Operations (PowerSDR & Thetis)
Topic: Electronic bias systems vs. PureSignal
Replies: 18
Views: 10765

Re: Electronic bias systems vs. PureSignal

>"John's (VY2WW) post of 10 May above explains everything. While not EBS, what the design does causes a dramatic memory effect that the PureSignal algorithm cannot keep up with, and it thereby enters a state whereby PS and the 89 fight each other..." Sorry Scott, but merely saying that &qu...
by w9ac
Sun Jul 30, 2017 1:57 pm
Forum: PureSignal Operations (PowerSDR & Thetis)
Topic: Electronic bias systems vs. PureSignal
Replies: 18
Views: 10765

Re: Electronic bias systems vs. PureSignal

"the 89 DOES indeed play games with bias..." I don't understand what that means. The Zener diode value change that Brad describes does nothing more than to adjust plate idling current into greater conduction over the RF cycle, moving the class of amplification further into AB and away from...
by w9ac
Tue Jul 04, 2017 4:23 pm
Forum: Apache Labs News
Topic: Rob Sherwood, NCOB's Dayton Presentation
Replies: 4
Views: 5761

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: 7030

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: 6481

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: 6481

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: 6481

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: 10765

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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