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Search took 0.00 seconds. Search: Posts Made By: plebian99
Forum: Marine Electronics 02-07-2022, 21:38
Replies: 20
Views: 1,843
Posted By plebian99
Re: KISS Revisited? Not really - for KA4WJA

And because every antenna and antenna length will have a different radiation angle you can never be sure that the receiving antenna is actually measuring the gain at the correct take off angle that...
Forum: Marine Electronics 22-01-2022, 00:10
Replies: 150
Views: 57,043
Posted By plebian99
Re: To SSB, or not to SSb...that is the question

Not surprising!

10log(p1/p2

100/50=3db
150/50=4.8db

Considering that users typical experience fading from 10 to 20db and most dont even have S-meter or one that can measure 1 to 10db...
Forum: Marine Electronics 09-01-2022, 12:18
Replies: 150
Views: 57,043
Posted By plebian99
Re: To SSB, or not to SSb...that is the question

WSPR and all the ham digital modes are all excellent modes. We really dont know how long these modes will be around and whether it will be WISPR 1, 2 or 3 or FT4, FT6 or FT8. There seems to be a...
Forum: Monohull Sailboats 08-01-2022, 20:03
Replies: 66
Views: 30,682
Posted By plebian99
Re: Alberg 30 vs. Triton vs. Ocean Voyager 26vs???

All your time, expense for a project? Just save your money and wait till you are in a position to get a decent 35ft boat that fits your budget. These days with Covid related inflation for materials...
Forum: Marine Electronics 08-01-2022, 19:55
Replies: 59
Views: 9,135
Posted By plebian99
Re: Garmin makes another aquisition

A disaster in the making and the killing of innovation, lateral and technical thinking by corporation that only thinks about returns and shareholder value. In 2 years time Vesper will be no more...
Forum: Marine Electronics 08-01-2022, 15:01
Replies: 19
Views: 1,757
Posted By plebian99
Re: conformal coating best practices

My only advice when doing "brush" conformal coating is this.

Get some spare headers and plugs even spare matching sacrifice cables.

Get some Dow Corning electrical grease as an alternative.
...
Forum: Marine Electronics 08-01-2022, 14:53
Replies: 19
Views: 1,757
Posted By plebian99
Re: conformal coating best practices

Thats not correct, maybe in the past. Most modern aftermarket conformal coatings you can solder through. Sure you might have to wipe your soldering tip a few more times for some gunk but you can...
Forum: Marine Electronics 07-01-2022, 14:34
Replies: 150
Views: 57,043
Posted By plebian99
Re: To SSB, or not to SSb...that is the question

I would not focus the HF arguments around ham radio.

1. HF radio in Africa and the Middle east is booming
2. HF radio in SE Asia is still high usage and still the prime telephone emergency comms...
Forum: Marine Electronics 07-01-2022, 04:10
Replies: 150
Views: 57,043
Posted By plebian99
Re: To SSB, or not to SSb...that is the question

The real issue with SSB is not so much conditions or it being obsolete technology.

On the coastal frequencies and for the need of communications in remote places its still the king. Even in the...
Forum: Marine Electronics 24-01-2020, 13:53
Replies: 95
Views: 14,071
Posted By plebian99
Re: Backstay antenna length decision

Well we are not installing a marine HF antenna in a controlled science lab.

1. Picking a magic length or arguing about some minimum length is really a nonsense in the real world. Sure its a...
Forum: Marine Electronics 24-01-2020, 03:17
Replies: 95
Views: 14,071
Posted By plebian99
Re: Backstay antenna length decision

Any altternative to the normal backstay will need to be considered very carefully. Its unfortunate that many hams think that the only objective in antenna design is to get an antenna up regardless...
Forum: Marine Electronics 22-01-2020, 01:27
Replies: 95
Views: 14,071
Posted By plebian99
Re: Backstay antenna length decision

While any random length of wire works, if you are a long distance sailor you need to consider the efficiency of the overall antenna system.


If you are mainly a coastal cruiser and hugging...
Forum: Marine Electronics 03-01-2019, 22:48
Replies: 8
Views: 1,232
Posted By plebian99
Re: ssb n vhf switch

It can be done you need to use whats called a diplexer. You need a specific diplexer that is optimised for VHF and HF. I seem to recall that there was one such device in the Shakespeare catalog. ...
Forum: Marine Electronics 03-01-2019, 22:38
Replies: 9
Views: 3,779
Posted By plebian99
Re: SSB Antenna Question - GTO-15 Connector?

Search out of type HN Amphenol connectors. These are proper high voltage connectors. If you mount it on a insulated support and fill it with Dow Corning DC4 dielectric grease you will never arc...
Forum: Marine Electronics 03-01-2019, 22:27
Replies: 9
Views: 3,779
Posted By plebian99
Re: SSB Antenna Question - GTO-15 Connector?

I would not use a Millen connector under any circumstance. Its a poor connector design that is very dangerous. Worst of all is that the material that they use to make this HIGHVOLTAGE connector is...
Forum: Marine Electronics 28-02-2018, 04:40
Replies: 20
Views: 5,376
Posted By plebian99
Re: Icom M802 & AT-140 Grounding???

Is this a infomercial post?

What "S-units" did you use to make your anecdotal observations? Is your meter calibrated or are just reporting LCD bars or needle wiggles as gain?

Maybe you can...
Forum: Marine Electronics 24-02-2018, 18:38
Replies: 1
Views: 733
Posted By plebian99
Re: Crosstalk / interference between Autopilot and stereo

Its not really cross talk. Its just interference. All electronic equipment makes noise, and this noise can be radiated or conducted on the power cables or into other equipment. The other point also...
Forum: Marine Electronics 24-02-2018, 18:30
Replies: 8
Views: 5,827
Posted By plebian99
Re: MFJ-16010 HF long wire antenna tuner

Good point. Mount it at the feedpoint and see how long it lasts! Even buried in a lazarette or locker would be so inconvenient. Feeding coax to a backstay and then using this tuner would be an act...
Forum: Marine Electronics 24-02-2018, 18:14
Replies: 20
Views: 5,376
Posted By plebian99
Re: Icom M802 & AT-140 Grounding???

Its wishful thinking that you are going "un-bond" your DC and RF ground. A reality check with a multimeter will soon confirm this!

Un-bonding is actually not the thing to do in my experience. What...
Forum: Marine Electronics 24-02-2018, 02:40
Replies: 8
Views: 5,827
Posted By plebian99
Re: MFJ-16010 HF long wire antenna tuner

You seriously recommend people use this piece of crap on a boat?

Its a really a poorly designed and built Antenna Tuner whose ratings are very questionable. I have repaired a few of these for...
Forum: Marine Electronics 23-02-2018, 01:07
Replies: 58
Views: 10,621
Posted By plebian99
Re: Is length of antenna for MF/HF frequencies (Rx only) important?

Try to get the coax feed plug that allows you to connect a coax fed antenna directly to the radio. I would try also to feed this piece of random wire with a RX only 9:1 Unun. You will pick up a lot...
Forum: Marine Electronics 23-02-2018, 01:00
Replies: 58
Views: 10,621
Posted By plebian99
Re: Is length of antenna for MF/HF frequencies (Rx only) important?

You have have very clear thinking about RX antennas.

1. The angle is also important for receive. The height of the ionosphere varies hence the take off angle and the angle of arrival will vary.
...
Forum: Marine Electronics 22-02-2018, 12:11
Replies: 58
Views: 10,621
Posted By plebian99
Re: Is length of antenna for MF/HF frequencies (Rx only) important?

That bit of wisdom might have some truth in it.

But what we are talking about is the very basics, like not putting a hole in your yacht hull and not go sailing. Radio physics might be hard to...
Forum: Marine Electronics 22-02-2018, 02:13
Replies: 58
Views: 10,621
Posted By plebian99
Re: Is length of antenna for MF/HF frequencies (Rx only) important?

With due respect to your friend. On 13.5 mhz a 22 meter antenna will make a lousy antenna whose radiation angle is too high. I have attached a radiation angle plot of this antenna. The angle of...
Forum: Marine Electronics 21-02-2018, 02:37
Replies: 58
Views: 10,621
Posted By plebian99
Re: Is length of antenna for MF/HF frequencies (Rx only) important?

Well if we deal with the facts its not hard to understand why less than perfect installations work over seawater.

Most installations that have problems have more to do with the way the antenna is...
Showing results 1 to 25 of 82
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