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#21 gman1971

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Posted 03 December 2020 - 09:53 PM

http://www.ittc.ku.e...ctor Filter.pdf



#22 gman1971

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Posted 03 December 2020 - 10:06 PM

Well, I am asking how did you measure desense? To do so you need to perform an ISO-tee, otherwise you're just guessing what the real problem(s) are. A car AM receiver is not meant to pick weak SETI signals from outer space... its meant to pick kW broadcast signals nearby, so it doesn't need to be that good.

 

Again, you need to invest in measuring equipment if you want range without requiring the use of other people's infrastructure, which I did, and very glad I did. Now I can determine what the problem(s) are by performing measurements in troublesome spots. Once you know if its desense, or intermod, or PIM, a bad antenna, crap cable... etc... then you can find a solution. Until then its all a guess, and guesswork gets really expensive, really fast....

 

Selectivity means filters, preselectors, cavities, etc... all those increase selectivity of a superhet. Which translates into "you probably need to invest on preselectors and cavities" but again, without performing any measurements, its only a guess, but one thing I've learned is that more selectivity never hurts... you just have to determine when too much selectivity is too much, and for that you need to measure.

 

Marc, a member from this forum, was the person who first introduced me to the concept of filtering a long while back...  that is when the range started to increase...

 

G.

 

I was approximately 1km from the base.  I did notice greater desense of the AM signal about twice as far away, but nothing 3 times as far or farther. 

 

My real question isn't about the scientific measurement, but about the practical application.  Theory is great, but when it lacks in the real world, its use diminishes. 



#23 STTScott

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Posted 05 December 2020 - 12:25 AM

This has been an intresting tecnical conversation about things this right-brained guy will never understand. Anyway, I found out today that the reason for the crickets is because, as someone pointed out earlier, this Caribbean island is a GMRS ghost town -- and not because there's an antenna issue. Forum member Terry WRJU327 was vacationing on one of the nearby island and we were able to connnect. Granted, the other island is roughly 7 miles away with a mountain between here and there, but I'm only running a Baofeng 8w handheld in my apartment with a 16" Nagoya UT-72 mobile antenna outside the door until a few more pieces of equipment come in to have an actual base setup with my Ed Fong UHF and VHF antennas lash to a 6' PVC-pipe mast (when you're a renter there's only so much you can get away with. Landlords get twitchy once you get near the 15' level, even tho the setup isn't nailed down to anything). Anyway, my Fong UHF antenna at around 12' should do me a bit better, and the 50w mobile that I ordered should do me even alot better.

 

Still you guys put on angood conversation that makes my eyes glaze over :)

 

Scott

WJX210



#24 gman1971

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Posted 05 December 2020 - 12:30 AM

Cool! Glad the issue is resolved, wish I lived near the ocean, over salt water.... :)

 

G.

 

This has been an intresting tecnical conversation about things this right-brained guy will never understand. Anyway, I found out today that the reason for the crickets is because, as someone pointed out earlier, this Caribbean island is a GMRS ghost town -- and not because there's an antenna issue. Forum member Terry WRJU327 was vacationing on one of the nearby island and we were able to connnect. Granted, the other island is roughly 7 miles away with a mountain between here and there, but I'm only running a Baofeng 8w handheld in my apartment with a 16" Nagoya UT-72 mobile antenna outside the door until a few more pieces of equipment come in to have an actual base setup with my Ed Fong UHF and VHF antennas lash to a 6' PVC-pipe mast (when you're a renter there's only so much you can get away with. Landlords get twitchy once you get near the 15' level, even tho the setup isn't nailed down to anything). Anyway, my Fong UHF antenna at around 12' should do me a bit better, and the 50w mobile that I ordered should do me even alot better.

 

Still you guys put on angood conversation that makes my eyes glaze over :)

 

Scott

WJX210



#25 berkinet

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Posted 05 December 2020 - 04:26 PM

...Anyway, I found out today that the reason for the crickets is because, as someone pointed out earlier, this Caribbean island is a GMRS ghost town

...

Given your physical location and your apparent need, general contact with other users and no immediate personal communications needs, you should seriously consider concentrating on ham radio.  There are a universe of options available to you and several are likely to work well.  You might even find there are ham repeaters near you.  Just search online for ham repeater listings.

 

Here is one such list https://www.repeater...=%&call=%&use=%


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Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

-- Marcus Aurelius


#26 STTScott

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Posted 05 December 2020 - 07:34 PM

Given your physical location and your apparent need, general contact with other users and no immediate personal communications needs, you should seriously consider concentrating on ham radio.  There are a universe of options available to you and several are likely to work well.  You might even find there are ham repeaters near you.  Just search online for ham repeater listings.

 

Here is one such list https://www.repeater...=%&call=%&use=%

I am in the process of studying for my Technician license test. But I figured GMRS was a good bridge in the meantime. And there is a Ham club on thos island that I've gotten involved with. I learned the value of amateur radio back in the 1970s, Little steps, my friend. Little steps.



#27 berkinet

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Posted 06 December 2020 - 07:02 AM

... Little steps, my friend. Little steps.

Suite yourself. I was only trying to help you. Just keep in mind, GMRS is not really a stepping stone to ham radio. They are two separate services, each with its own purpose.  Many, many people start with ham radio because it provides what they are looking for in a general radio service. GMRS, on the other hand, while usable for local communications with strangers, like ham 440mHz, is historically, and still to a large extent, designed for communications within existing groups, like families. This is apparent from the licensing model.  For that reason. it is quite possible that you will find, as you seem to have already noticed, that there may be few to no people to talk to.  

 

And, a final point to make all of this clear. There is no GMRS equivalent of "CQ."


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Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

-- Marcus Aurelius


#28 n4gix

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Posted 06 December 2020 - 04:18 PM

And, a final point to make all of this clear. There is no GMRS equivalent of "CQ."

 

Er, there is sorta-kinda an equivalent: "WQWU626 listening on the Midwest GMRS Network."  :P


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#29 tnorris

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Posted 15 December 2020 - 10:00 AM

This has been an intresting tecnical conversation about things this right-brained guy will never understand. Anyway, I found out today that the reason for the crickets is because, as someone pointed out earlier, this Caribbean island is a GMRS ghost town -- and not because there's an antenna issue. Forum member Terry WRJU327 was vacationing on one of the nearby island and we were able to connnect. Granted, the other island is roughly 7 miles away with a mountain between here and there, but I'm only running a Baofeng 8w handheld in my apartment with a 16" Nagoya UT-72 mobile antenna outside the door until a few more pieces of equipment come in to have an actual base setup with my Ed Fong UHF and VHF antennas lash to a 6' PVC-pipe mast (when you're a renter there's only so much you can get away with. Landlords get twitchy once you get near the 15' level, even tho the setup isn't nailed down to anything). Anyway, my Fong UHF antenna at around 12' should do me a bit better, and the 50w mobile that I ordered should do me even alot better.

 

Still you guys put on angood conversation that makes my eyes glaze over :)

 

Scott

WJX210

 

Glad I was able to make contact with you while my family was vacationing down there.  It was also my first contact using a Baofeng 8W handheld with a stock antenna I had just purchased.  Your signal was loud and clear. 

 

My wife even forgave me for bringing it when I finally made contact, she thought it was great after that, and now wants a base unit at home, lol.

 

Terry

WRJU327



#30 JB007Rules

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Posted 16 December 2020 - 10:52 AM

I'll be travelling to the US VI soon here.  I've been the main supplier of all the in vehicle laptops (Toughbooks) for the police, fire, ems, and for the hospitals.  I have some monster meetings and installs coming up (Which I was supposed to go down in March then the over-hyped rona appeared.... But I digress there...).  Anyways I'm planning on bringing both a high power (45W) and my hand held to try to make some contacts from my hotel room.  I don't know yet when I'm going (probably another couple months here if I had to guess) but I will call out when I do get there!

I've enjoyed reading the conversations and thanks for all your input Gman!!  I've learned a lot from reading all what you wrote!  Very helpful!


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#31 berkinet

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Posted 16 December 2020 - 05:05 PM

then the over-hyped rona appeared....

That comment added nothing to your post. And further, what is the point of bringing up your personal opinion about something that has nothing to do with GMRS radio to begin with. This forum tends to work a lot better when people stay on topic.


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Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

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#32 gman1971

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Posted 16 December 2020 - 06:11 PM

Glad I could help.

 

Much like I told another person to leave the "Americans think they are the world" comments out of their posts, I have to agree with Berkinet on his assestment. I think I speak for most people here when I say "nobody here has had a good time during this whole situation..."  However, stating that something is over-hyped might not sit well with a random person who reads the post and has had a relative, or dear one die b/c of it. I am pretty certain the situation is not over-hyped for that person.

 

Again, please forgive me if you feel I am trying to overstep on your 1st Amendment, I am not, and you're free to say whatever you want, however, always remember that whatever you say will always have consequences... and especially so in written form. (and I know that well) 

 

Cheers!

 

G.


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#33 berkinet

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Posted 17 December 2020 - 03:29 AM

..Again, please forgive me if you feel I am trying to overstep on your 1st Amendment,...

 

I agree with your comment about accepting responsibility for the consequences of our words [and actions] while keeping in mind the 1st amendment to the US Constitution applies specifically to the government:

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

 

Courts have held the term Congress to apply to government in general. However, private enterprises and citizens are not bound by this amendment. So, whatever freedom of expression we have on this forum is limited to that which the owners and operators allow us.  Fortunately, on this forum we have been given a fairly broad latitude in this respect. However, along with that privilege of expression comes the responsibility to use it thoughtfully and not abuse it.


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Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

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