All my RX path questions

[jwt873]

So you want to hear a transmitter 36 miles from you. I've counted over 150 posts in 8 different threads so far on the subject. I'm starting to think you might be playing with us.

Go back to post #25 by AB5ID in this thread. Go up on your roof or up a ladder with the radio using a rubber duck antenna. Listen for the station. I'd be surprised if you couldn't hear it.

Try that first, then we can go back to the endless Yagi/omni/db/dbi/coax/path loss/amplifier discussions.

 

[Bonkk083]

So you want to hear a transmitter 36 miles from you. I've counted over 150 posts in 8 different threads so far on the subject. I'm starting to think you might be playing with us.

Go back to post #25 by AB5ID in this thread. Go up on your roof or up a ladder with the radio using a rubber duck antenna. Listen for the station. I'd be surprised if you couldn't hear it.

Try that first, then we can go back to the endless Yagi/omni/db/dbi/coax/path loss/amplifier discussions.

What will go 36 miles

 

[buddrousa]

In the right environment a rubber duck

 

[Bonkk083]

In the right environment a rubber duck

Would the back side of the yagi pick up a signal from 30 miles

 

[KevinC]

I consolidated all the RX path questions into one thread. Please don't start any new threads asking basically the same questions over and over again.

 

[Bonkk083]

How much loss would I have with connecting 2 Yagi's together with a T connector

 

[Ubbe]

I the two yagis receive the same signal and a stacking harness are used that will give a 100 ohm impedance from each coax, then a 3dB gain will happen. If the two yagis are pointing in different directions then it depends of the coax length to each antenna and the frequency used. If that frequency tuned stacking harness are used you will loose 3db in signal from one antenna. If the coax to one antenna are at a very undesirable length it could be seen as an almost shortcircuit and kill a lot of signal. At the other hand it could present a high ohm impedance and only reduce the signal one dB.

It's almost impossible to tell what will happen and have to be tested.

Usually if one would like to receive several systems in the same frequency band and in different directions and they need to use directional antennas then an extra scanner are used so that each scanner have its own optimal antenna. A second hand cheap scanner, or a $25 SDR dongle, that only do one system type like P25 can often be used and will be cheaper and give better result than a complicated antenna system connected to one scanner that tries to do it all.

/Ubbe

 

[p1879]

Every receive or transmit location-- and installation--has many variables. RF signals exist in a micro-environment governed my many factors and interactions, that cannot always be predicted or calculated-- except in purely theoretical terms-- if then.

Even when installation conditions are optimized, issues such as the pathway of the signal, nearby transmitters like a 5G site or broadcast stations, and even the type of vegetation present can be factors.

Not that you are in a predominant long -leaf pine area likely, but just as an example LLP needles absorb a lot of RF at certain frequencies, 800 MHZ among them, to my understanding. Doubt this is an issue in your case, but it is mentioned --simply-- as the whole equation of success in listening can be complex and very localized.

The very core of our hobby is built around experimentation, to see what works in each particular case. This personal journey of exploration can result in discovery of such unpredictable phenomena as "sweet spots" , dead zones, possibilities for improvement, or even abandonment of a project in some few cases.

You have been given some great advice about some very simple efforts to glean some knowledge about your situation, by the kind and patient correspondents here. Endlessly pursuing hypothetical scenarios will only result in frustration for one and all.

A lot of good folks have shared their know-how here, which you have received in great abundance. It is befitting that you reciprocate with the initiative to experiment .

 

[Bonkk083]

Is DX Engineering lmr 400 equivalent to Times Microwave good

 

[prcguy]

Is DX Engineering lmr 400 equivalent to Times Microwave good

About the same specs. The only problem I see is the 400MAX cable has stranded center conductor that will not work with Times EZ connectors, which is my favorite connector.

 

[Bonkk083]

About the same specs. The only problem I see is the 400MAX cable has stranded center conductor that will not work with Times EZ connectors, which is my favorite connector.

Where can `I find the Lmr-400 at a resonable price

 

[prcguy]

Where can `I find the Lmr-400 at a resonable price

What do you consider reasonable?

 

[Bonkk083]

What do you consider reasonable?

Under $200

 

[KevinC]

Under $200

Per foot? I'll sell all you want for only $100 a foot.

 

[prcguy]

Under $200

I don’t know how many feet you need. How much is reasonable per foot?

 

[Bonkk083]

I don’t know how many feet you need. How much is reasonable per foot?

50'

 

[prcguy]

50'

So what is a reasonable price for 50ft?

 

[Bonkk083]

So what is a reasonable price for 50ft?

I have no clue really I was looking at different places some was over $200 for 50'

 

[Bonkk083]

Per foot? I'll sell all you want for only $100 a foot.

50'

 

[prcguy]

I have no clue really I was looking at different places some was over $200 for 50'

What kind of connectors do you need on each end?