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Search: Posts Made By: dljosephson
Forum: ADS-B 07-11-2017, 01:37 PM
Replies: 6
Views: 2,038
Posted By dljosephson
978?

Most people who set up ADS-B ground stations feeding Flightaware and the other aggregators just send 1090 returns. How many are sending 978?
Forum: RV-12 01-27-2017, 10:53 PM
Replies: 44
Views: 13,428
Posted By dljosephson
Ducati regulator failure causes

I've spent some time tearing apart Ducati regulators trying to answer this question. My day job is running a small electronics manufacturing company so we deal with failure analysis (fortunately not...
Forum: APRS Tracking 01-12-2017, 05:59 PM
Replies: 3
Views: 3,764
Posted By dljosephson
Airborne broadband internet access, experiences?

This isn't APRS, but I figured this was the best group of VAF members to ask. We all know that traditional cell phones (800-870 MHz) can't be used in flight due to FCC prohibition (47CFR22.295)....
Forum: RV General Discussion/News 09-17-2016, 08:52 PM
Replies: 29
Views: 3,819
Posted By dljosephson
I very much doubt that Stein would be selling 75...

I very much doubt that Stein would be selling 75 ohm connectors, except for the old widescreen TV's we had in the aft lounge of all our planes...

You can see the difference pretty clearly, see this...
Forum: RV General Discussion/News 09-16-2016, 05:41 PM
Replies: 29
Views: 3,819
Posted By dljosephson
Not really. We can save the Smith chart for...

Not really. We can save the Smith chart for later, and people who know RF can tune out now for this oversimplification. RF sources have a design impedance, which means the value of load that will...
Forum: RV General Discussion/News 09-16-2016, 12:46 AM
Replies: 29
Views: 3,819
Posted By dljosephson
There are connectors that can be disassembled and...

There are connectors that can be disassembled and threaded back together, and they were the only type used by the military for years (or better yet, newly assembled on to the end of a cut piece of...
Forum: Steam Gauges 07-26-2016, 01:38 AM
Replies: 3
Views: 1,260
Posted By dljosephson
Altimeter/ASI overhaul shops?

Any recommendations for good shops for overhaul of pitot/static gauges? I have an airspeed indicator I would like calibrated, range changed etc.
Forum: RV General Discussion/News 07-18-2016, 11:01 PM
Replies: 10
Views: 1,730
Posted By dljosephson
Can't go wrong with a full length DP, Comant or...

Can't go wrong with a full length DP, Comant or other similar straight com antenna, you should have that for your primary com before you add shortened or bent antennas for #2.

The Archer and similar...
Forum: COMM 07-07-2016, 12:03 AM
Replies: 3
Views: 911
Posted By dljosephson
The issue with SL30/SL40 intercoms seems to be...

The issue with SL30/SL40 intercoms seems to be that people don't know how to adjust the microphone squelch, which is available separately for each mic from the systems menu. Also, some don't like the...
Forum: RV-12 05-05-2016, 12:28 PM
Replies: 4
Views: 2,458
Posted By dljosephson
Mel, a question. An S-LSA needs to have a current...

Mel, a question. An S-LSA needs to have a current airworthiness inspection in order to be transitioned to E-LSA. What happens when an S-LSA suffers some misfortune and is not repairable with S-LSA...
Forum: COMM 04-16-2016, 08:21 PM
Replies: 9
Views: 2,086
Posted By dljosephson
I built a similar thing some years ago into a...

I built a similar thing some years ago into a portable intercom. You need to manage three signals: receive audio, transmit audio and ptt. The receive audio can probably by Y'd together through...
Forum: COMM 12-18-2015, 01:29 PM
Replies: 13
Views: 3,145
Posted By dljosephson
Microphones

As a manufacturer of microphones (not for aviation) I am often surprised at how little attention people pay to that part of the system. Grounding, antenna mounting and location, solid power wiring...
Forum: COMM 08-31-2015, 10:39 PM
Replies: 11
Views: 2,423
Posted By dljosephson
We have cursed those ITT Schadow switches and...

We have cursed those ITT Schadow switches and their Asian knockoffs for decades in the pro audio business where they are used in consoles, processing equipment etc. They do not belong in any...
Forum: COMM 06-11-2015, 11:38 PM
Replies: 8
Views: 1,961
Posted By dljosephson
Nav antenna comparison

The vee dipole antennas seem the same because they mostly are, except for the ruggedness of the termination between the rod elements and the cable. The simplest ones from the 1940s containing steel...
Forum: RV-12 08-12-2014, 04:24 PM
Replies: 15
Views: 9,054
Posted By dljosephson
Pulled rivets without mandrels

This is an old thread, but since it comes up in searches I thought I should correct an error. Heintz at Zenith uses the Avdel rivets, and measured and uses their shear strength with the mandrel...
Forum: COMM 03-27-2014, 08:36 PM
Replies: 7
Views: 2,666
Posted By dljosephson
8.33 kHz in USA

It hasn't come to ATC communication yet, but 8.33 spacing is used in the USA for airline company and flight test communications. It's a lot easier to get coordination for an 8.33 kHz flight test...
Forum: APRS Tracking 11-06-2012, 11:46 AM
Replies: 2
Views: 3,663
Posted By dljosephson
APRS Telemetry?

Is anyone using the APRS telemetry feature for performance test logging? It would be neat to define a common format for OAT, tach, mag heading and other non-GPS parameters that could really simplify...
Showing results 1 to 17 of 17

 
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