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Re: Using an insulated backstay for A) Navtex rec. and B) ssb transc
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GYXU > Boats > Re: Using an insulated backstay for A) Navtex rec. and B) ssb transc 30 May 2008 04:22:19

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Re: Using an insulated backstay for A) Navtex rec. and B) ssb transc

Bob Furterona 29 May 2008 18:48:06
 
"Len" <lendenbesten@googl­email.com> wrote in message
news:0bbc5bca-ddfd-­4d62-bc81-49b7c40481­b6@b1g2000hsg.google­groups.com...
Hi ng,
The boat came with a Fastnet Radio FMD55P navtex-receiver, using a
passive antenna: the insulated backstay via a Balun.
Now I installed a ssb transceiver + tuner and connected the tuner to
the backstay. The navtex receiver is not in use at the moment cause
I'm sure the transmitting power of the ssb wil fry it.
Is there a way to solve this cause I would like to use the navtex
again,.It has no possibility for an active antenna, just passive. I
would like to use the backstay for both now I "heared" about a switch
that immediately switches off the connection to the navtex when it
senses ssb-transmitting, Any thoughts ? Every reaction will be highly
appreciated.
Regards, Len

A circulator with 25+ dB of isolation will work just fine.


Add comment
You 29 May 2008 22:50:17 permanent link ]
 In article <1tj5v0.vkr.17.1@ne­ws.alt.net>,
"Bob Furterona" <bob.furterona23@gm­ail.com> wrote:

Only if they transmit 100 kW EIRP. AM radio sensitivity is around 100 uV. FM
radio is 0.5 uV.

I don't know what school you went to, but your RF Engineering Degree,
must have come from a Cracker Jacks Box...... Typical AM Broadcast
Field Strength Measurements for Antenna Pattern Contours are done
at 100 uv/Meter, and those levels are a VARY STRONG Signals, and usually
out from the Transmitter site, many miles.
Add comment
Richard Casady 29 May 2008 22:59:53 permanent link ]
 On Thu, 29 May 2008 10:58:08 -0400, "Bob Furterona"
<bob.furterona23@gm­ail.com> wrote:

No, no, no! A Faraday antenna is better for noise. Loopsticks are poor
antennas at best.

For what it's worth, you can get a better AM signal on a portable
radio by attaching a random length of wire to the end of the FM whip.

Casady
Add comment
Larry 30 May 2008 04:22:19 permanent link ]
 You <you@shadow.orgs> wrote in news:you-F83814.105­00929052008
@netnews.worldnet.a­tt.net:

I don't know what school you went to, but your RF Engineering Degree,
must have come from a Cracker Jacks Box...... Typical AM Broadcast
Field Strength Measurements for Antenna Pattern Contours are done
at 100 uv/Meter, and those levels are a VARY STRONG Signals, and usually
out from the Transmitter site, many miles.

about 180' from the business end of the 3-tower array of WWKB-AM's 50KW
blowtorch in Hamburg, NY is a very nice looking house in a very nice
looking neighborhood lined up exactly with the array....right off the end.

I wonder how they shut down any lights in that house?.....(c;

Field Strength in the living room is in KV/m......hee hee.

I'd like to live there, myself. I'd have an impressive loop on 1520 Khz in
the attic to power all the lighting from rectified RF 24/7/365! Wonder if
anyone makes an AM band resonant water heater??...hmm....

Bet I could bend their pattern....(c;

Add comment
 

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GYXU > Boats > Re: Using an insulated backstay for A) Navtex rec. and B) ssb transc 30 May 2008 04:22:19

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