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My tower is at 100 ft with 3 UHF , 3 VHF high and one VHF Low antenna.
Three tower mounted Preamps that feed into three RG11 runs. to the base. ....I have no problems with the VHF high and the UHF coming into my headin however, I can't find a combiner that will let me add in the VHF-low into the mix. .
Radio Shack used to make a combiner for all 3 TV bands, the 15-1236:

RadioShack15-1236_1.jpg


You can do the same thing by using a UVSJ (UHF/VHF Separator-Joiner) and a HLSJ (VHF-High/VHF-Low Separator-Joiner). This is one way to do it:

How to Combine Antennas for 3 TV Bands.jpg


With this method there is only one insertion loss for UHF, and you can insert a preamp for UHF only (if desired) between the UHF antenna and the UVSJ if the UVSJ can pass DC on the UHF side.

UVSJs and HLSJs are also known as Diplexers. They can combine or separate two different bands.

Calaveras uses a similar method for his TV antennas:

Antenna_Block_Diagram_5.jpg
 

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Radio Shack used to make a combiner for all 3 TV bands, the 15-1236:

View attachment 3116399

You can do the same thing by using a UVSJ (UHF/VHF Separator-Joiner) and a HLSJ (VHF-High/VHF-Low Separator-Joiner). This is one way to do it:

View attachment 3116426

With this method there is only one insertion loss for UHF, and you can insert a preamp for UHF only (if desired) between the UHF antenna and the UVSJ if the UVSJ can pass DC on the UHF side.

UVSJs and HLSJs are also known as Diplexers. They can combine or separate two different bands.

Calaveras uses a similar method for his TV antennas:

View attachment 3116447
Or this Terrestrial signal combiner
 

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Discussion Starter · #23 ·
Thank you for all the help. I have my game plan and my system redesign. I will update here hopefully next weekend after I implement my changes and install the Advant X that should be here this week.

Mike
 

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Discussion Starter · #24 ·
3117261


Here is the revised plan. only one low band antenna to Charlottesville but I did draw out a low band on every leg ( Future maybe)
 

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Good plan. The Avant X will allow you to move stations around, so you can put co-channel stations onto different channels internally, hopefully bringing you more stations than you have now. If I'm looking at this right, you may have at least these conflicts, depending on just how many of the stations you actually see:

14 - WXOB-LD/WWTD-D (WXOB-LD currently off the air)
15 - WUDW-LD/WFDC
23 - WTVR/WDWA-LD
24 - WRLH/WDCO-CD
30 - WFWG-LD/WIAV-CD (WIAV-CD is in ATSC 3.0 and just carries TBD programming)
34 - WZTD-LD/WRC
35 - WVIR-CD/WPXW
36 - WRID-LD/WTTG (WRID-LD currently off the air)

You could shuffle all the duplicates up above channel 37 if you wanted.

- Trip
 
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Discussion Starter · #26 ·
I have almost everything in place. One Amplifier from Televes for Richmond arrive as an empty box on April 1st. I reached out and I'm waiting for the actual amp to arrive. I decided to move forward with the Advant X and I will say that I'm disappointed in the lack of documentation.

I can get some video to pass only if I use the test port on the Advant X and not the TV Port. Not all of the channels That I have included dont show. but if I connect directly to the test port on the power injector I get more channels than I want.
 

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I have almost everything in place. One Amplifier from Televes for Richmond arrive as an empty box on April 1st. I reached out and I'm waiting for the actual amp to arrive. I decided to move forward with the Advant X and I will say that I'm disappointed in the lack of documentation.

I can get some video to pass only if I use the test port on the Advant X and not the TV Port. Not all of the channels That I have included dont show. but if I connect directly to the test port on the power injector I get more channels than I want.
Can you post pictures of your configuration and your adjust tabs after adjustment?. Make sure you load the main output with a 75ohm terminator during adjustment. And watch for the programmed output level. The Avant is capable of very high output levels that may be overdriving your distribution
 

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Discussion Starter · #28 ·
Can you post pictures of your configuration and your adjust tabs after adjustment?. Make sure you load the main output with a 75ohm terminator during adjustment. And watch for the programmed output level. The Avant is capable of very high output levels that may be overdriving your distribution
I ran a couple of tests first thing this morning.

1. I placed the TV directly off the output of the Advant X and ran the adjust.
green and then red error

2. I placed a 75 ohm plug on the output of the Advant X and ran the Adjust again. No errors

3. I placed the output to the distribution amplifier and ran the adjust . green and then a failure

4. The output of the distribution amp goes into an 8 way splitter. I connected the advant X output to the 8 way splitter and ran the adjust.
It went green and then red.

I went back to #2 above and when it completed I connected the cable from the 8 way splitter to the output of the Advant X. I tested the channels on the TV.

The testing only brings up more questions.
What should I use to feed the The distribution that will load the Advant X properly ? or do I need to use the dummy plug any time I want to run adjust ?

config file
<?xml version="1.0" encoding="UTF-8"?><Configurations>
<Avantx date="06/04/2021" description="" name="test-config" ref="532180" zone="">
<dc>-86</dc>
<filter ch_in="2" ch_out="2" id="0"> </filter>
<filter ch_in="8" ch_out="8" id="1"> </filter>
<filter ch_in="10" ch_out="10" id="2"> </filter>
<filter ch_in="22" ch_out="22" id="3"> </filter>
<filter ch_in="23" ch_out="23" id="4"> </filter>
<filter ch_in="24" ch_out="24" id="5"> </filter>
<filter ch_in="28" ch_out="28" id="6"> </filter>
<filter ch_in="29" ch_out="29" id="7"> </filter>
<filter ch_in="-112" ch_out="16" id="8"> </filter>
<filter ch_in="-102" ch_out="26" id="9"> </filter>
<filter ch_in="-96" ch_out="32" id="10"> </filter>
<filter ch_in="-93" ch_out="45" id="11"> </filter>
<filter ch_in="-57" ch_out="7" id="12"> </filter>
<filter ch_in="-55" ch_out="9" id="13"> </filter>
<filter ch_in="-49" ch_out="15" id="14"> </filter>
<filter ch_in="-33" ch_out="31" id="15"> </filter>
<filter ch_in="-30" ch_out="34" id="16"> </filter>
<filter ch_in="-29" ch_out="35" id="17"> </filter>
<filter ch_in="-28" ch_out="36" id="18"> </filter>
<filter ch_in="0" ch_out="0" id="19"> </filter>
<filter ch_in="0" ch_out="0" id="20"> </filter>
<filter ch_in="0" ch_out="0" id="21"> </filter>
<filter ch_in="0" ch_out="0" id="22"> </filter>
<filter ch_in="0" ch_out="0" id="23"> </filter>
<filter ch_in="0" ch_out="0" id="24"> </filter>
<filter ch_in="0" ch_out="0" id="25"> </filter>
<filter ch_in="0" ch_out="0" id="26"> </filter>
<filter ch_in="0" ch_out="0" id="27"> </filter>
<filter ch_in="0" ch_out="0" id="28"> </filter>
<filter ch_in="0" ch_out="0" id="29"> </filter>
<filter ch_in="0" ch_out="0" id="30"> </filter>
<filter ch_in="0" ch_out="0" id="31"> </filter>
<fm_on>0</fm_on>
<out_level>91</out_level>
<out_eq>8</out_eq>
<catv_at>31</catv_at>
<catv_eq>0</catv_eq>
<ch_type>0</ch_type>
</Avantx>
</Configurations>

3119548
3119549
 

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Discussion Starter · #29 ·
I ran a couple of tests first thing this morning.

1. I placed the TV directly off the output of the Advant X and ran the adjust.
green and then red error

2. I placed a 75 ohm plug on the output of the Advant X and ran the Adjust again. No errors

3. I placed the output to the distribution amplifier and ran the adjust . green and then a failure

4. The output of the distribution amp goes into an 8 way splitter. I connected the advant X output to the 8 way splitter and ran the adjust.
It went green and then red.

I went back to #2 above and when it completed I connected the cable from the 8 way splitter to the output of the Advant X. I tested the channels on the TV.

The testing only brings up more questions.
What should I use to feed the The distribution that will load the Advant X properly ? or do I need to use the dummy plug any time I want to run adjust ?

config file

<?xml version="1.0" encoding="UTF-8"?><Configurations>
<Avantx date="05/04/2021" description="" name="Lussier05APRIL21" ref="532180" zone="">
<dc>-86</dc>
<filter ch_in="2" ch_out="2" id="0"> </filter>
<filter ch_in="72" ch_out="8" id="1"> </filter>
<filter ch_in="74" ch_out="10" id="2"> </filter>
<filter ch_in="86" ch_out="22" id="3"> </filter>
<filter ch_in="87" ch_out="23" id="4"> </filter>
<filter ch_in="88" ch_out="24" id="5"> </filter>
<filter ch_in="92" ch_out="28" id="6"> </filter>
<filter ch_in="93" ch_out="29" id="7"> </filter>
<filter ch_in="-112" ch_out="16" id="8"> </filter>
<filter ch_in="-102" ch_out="26" id="9"> </filter>
<filter ch_in="-96" ch_out="32" id="10"> </filter>
<filter ch_in="-93" ch_out="45" id="11"> </filter>
<filter ch_in="-57" ch_out="7" id="12"> </filter>
<filter ch_in="-55" ch_out="9" id="13"> </filter>
<filter ch_in="-49" ch_out="15" id="14"> </filter>
<filter ch_in="-33" ch_out="31" id="15"> </filter>
<filter ch_in="-30" ch_out="34" id="16"> </filter>
<filter ch_in="-29" ch_out="35" id="17"> </filter>
<filter ch_in="-28" ch_out="36" id="18"> </filter>
<filter ch_in="0" ch_out="0" id="19"> </filter>
<filter ch_in="0" ch_out="0" id="20"> </filter>
<filter ch_in="0" ch_out="0" id="21"> </filter>
<filter ch_in="0" ch_out="0" id="22"> </filter>
<filter ch_in="0" ch_out="0" id="23"> </filter>
<filter ch_in="0" ch_out="0" id="24"> </filter>
<filter ch_in="0" ch_out="0" id="25"> </filter>
<filter ch_in="0" ch_out="0" id="26"> </filter>
<filter ch_in="0" ch_out="0" id="27"> </filter>
<filter ch_in="0" ch_out="0" id="28"> </filter>
<filter ch_in="0" ch_out="0" id="29"> </filter>
<filter ch_in="0" ch_out="0" id="30"> </filter>
<filter ch_in="0" ch_out="0" id="31"> </filter>
<fm_on>0</fm_on>
<out_level>115</out_level>
<out_eq>0</out_eq>
<catv_at>31</catv_at>
<catv_eq>0</catv_eq>
<ch_type>0</ch_type>
</Avantx>
<Avantx date="05/04/2021" description="" name="mytv" ref="532180" zone="">
<dc>-86</dc>
<filter ch_in="2" ch_out="2" id="0"> </filter>
<filter ch_in="74" ch_out="10" id="1"> </filter>
<filter ch_in="86" ch_out="22" id="2"> </filter>
<filter ch_in="87" ch_out="23" id="3"> </filter>
<filter ch_in="88" ch_out="24" id="4"> </filter>
<filter ch_in="92" ch_out="28" id="5"> </filter>
<filter ch_in="-112" ch_out="16" id="6"> </filter>
<filter ch_in="-102" ch_out="26" id="7"> </filter>
<filter ch_in="-96" ch_out="32" id="8"> </filter>
<filter ch_in="-57" ch_out="7" id="9"> </filter>
<filter ch_in="-55" ch_out="9" id="10"> </filter>
<filter ch_in="-49" ch_out="15" id="11"> </filter>
<filter ch_in="-43" ch_out="21" id="12"> </filter>
<filter ch_in="-33" ch_out="31" id="13"> </filter>
<filter ch_in="-31" ch_out="33" id="14"> </filter>
<filter ch_in="-30" ch_out="34" id="15"> </filter>
<filter ch_in="-29" ch_out="35" id="16"> </filter>
<filter ch_in="-28" ch_out="36" id="17"> </filter>
<filter ch_in="0" ch_out="0" id="18"> </filter>
<filter ch_in="0" ch_out="0" id="19"> </filter>
<filter ch_in="0" ch_out="0" id="20"> </filter>
<filter ch_in="0" ch_out="0" id="21"> </filter>
<filter ch_in="0" ch_out="0" id="22"> </filter>
<filter ch_in="0" ch_out="0" id="23"> </filter>
<filter ch_in="0" ch_out="0" id="24"> </filter>
<filter ch_in="0" ch_out="0" id="25"> </filter>
<filter ch_in="0" ch_out="0" id="26"> </filter>
<filter ch_in="0" ch_out="0" id="27"> </filter>
<filter ch_in="0" ch_out="0" id="28"> </filter>
<filter ch_in="0" ch_out="0" id="29"> </filter>
<filter ch_in="0" ch_out="0" id="30"> </filter>
<filter ch_in="0" ch_out="0" id="31"> </filter>
<fm_on>0</fm_on>
<out_level>115</out_level>
<out_eq>0</out_eq>
<catv_at>31</catv_at>
<catv_eq>0</catv_eq>
<ch_type>0</ch_type>
</Avantx>
<Avantx date="05/04/2021" description="" name="working-bypass" ref="532180" zone="">
<dc>-86</dc>
<filter ch_in="2" ch_out="2" id="0"> </filter>
<filter ch_in="3" ch_out="3" id="1"> </filter>
<filter ch_in="8" ch_out="8" id="2"> </filter>
<filter ch_in="10" ch_out="10" id="3"> </filter>
<filter ch_in="22" ch_out="22" id="4"> </filter>
<filter ch_in="23" ch_out="23" id="5"> </filter>
<filter ch_in="24" ch_out="24" id="6"> </filter>
<filter ch_in="28" ch_out="28" id="7"> </filter>
<filter ch_in="29" ch_out="29" id="8"> </filter>
<filter ch_in="-112" ch_out="16" id="9"> </filter>
<filter ch_in="-102" ch_out="26" id="10"> </filter>
<filter ch_in="-96" ch_out="32" id="11"> </filter>
<filter ch_in="-93" ch_out="45" id="12"> </filter>
<filter ch_in="-57" ch_out="7" id="13"> </filter>
<filter ch_in="-55" ch_out="9" id="14"> </filter>
<filter ch_in="-49" ch_out="15" id="15"> </filter>
<filter ch_in="-33" ch_out="31" id="16"> </filter>
<filter ch_in="-30" ch_out="34" id="17"> </filter>
<filter ch_in="-29" ch_out="35" id="18"> </filter>
<filter ch_in="-28" ch_out="36" id="19"> </filter>
<filter ch_in="0" ch_out="0" id="20"> </filter>
<filter ch_in="0" ch_out="0" id="21"> </filter>
<filter ch_in="0" ch_out="0" id="22"> </filter>
<filter ch_in="0" ch_out="0" id="23"> </filter>
<filter ch_in="0" ch_out="0" id="24"> </filter>
<filter ch_in="0" ch_out="0" id="25"> </filter>
<filter ch_in="0" ch_out="0" id="26"> </filter>
<filter ch_in="0" ch_out="0" id="27"> </filter>
<filter ch_in="0" ch_out="0" id="28"> </filter>
<filter ch_in="0" ch_out="0" id="29"> </filter>
<filter ch_in="0" ch_out="0" id="30"> </filter>
<filter ch_in="0" ch_out="0" id="31"> </filter>
<fm_on>0</fm_on>
<out_level>91</out_level>
<out_eq>8</out_eq>
<catv_at>31</catv_at>
<catv_eq>0</catv_eq>
<ch_type>0</ch_type>
</Avantx>
</Configurations>




3119557
3119558
 

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When inside of input specs, all your adjusted channels should reach the desired level in the adjust screen. Do you have a way to measure input levels on those RF carriers that you are feeding the Avant in each input?

The right way to adjust is always with a 75 ohm load connected to the main output directly. The Avant reads the output level there as it adjusts each filter gain, and if there's any mismatch the reading is not accurate, and the adjustment not correct.
 

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Discussion Starter · #31 ·
I did this two ways. I used the diagnostic tools in a samsung TV as well as a spectrum analyzer. I compared the output of the spectrum analyzer to the diagnostic tool and came up with a very close DBm reading. the text below shows both the DBm and the DBmV for 3 of the 4 antennas. only antenna is off line right now awaiting a replacement Televes Preamp.

ALL Preamps are Televes Preamps.

All levels taken on the test port of the Power injector
tools used a Samung Smart TV diagnostic tools and spectrum analyzer
DBmV was calculated with the following formula

Value in dBm + 48.75 = Value in dBmV

Charlottesville VHF-Low/VHF-Hi/UHF Antenna
========================================
Channel Station Frequency Level in Dbm in DbmV
3 WHSV 20 27.1 75.85
6 WTVR 23 29.2 77.95
8 WRIC 28 31.1 79.85
16 WVAW 16 30.7 79.45
19 WCAV 32 31.5 80.25
23 WNVT 22 25 73.75
27 ??? 32 35.1 83.85
28 WWBK—LD 25 16.8 65.55
29 WVIR 2 25.8 74.55
29-1 WVIR 32 24.7 73.45
35 WRLH 24 26.7 75.45
41 WNVC 26 35.5 84.25
57 WCVW 29 29.9 78.65
65 WUPV 8 26.4 75.15

Charlottesville VHF-Hi/UHF
======================================
Channel Station Frequency level in DBm Level in DBmV
6 WTVR 23 33.4 82.15
8 WRIC 28 35.5 84.25
12 WWBT 10 32 80.75
15 WUDW-LD 15 22.3 71.05
16 WVAW 16 19.4 68.15
23 WNVT 22 33.2 81.95
27 ??? 32 24.8 73.55
28 WWBK 25 25.4 74.15
30 WFWG 30 24.2 72.95
35 WRLH 24 35.2 83.95
41 WNVC 26 24.6 73.35
45 WZTD 34 26.2 74.95
57 WCVW 29 33.3 82.05
65 WUPV 8 33.3 82.05

Washington DC
=======================================
Channel Station Frequency Level in Dbm level in DbmV
4 WRC 34 25.1 73.85
5 WTTG 36 28 76.75
6 WTVR 23 16.2 64.95
7 WJLA 7 21.6 70.35
8 WRIC 28 33.8 82.55
9 WUSA 9 17.4 66.15
12 WWBT 10 16.1 64.85
14 ???? 15 16.8 65.55
16 WVAW 16 16.7 65.45
19 WCAV 32 28.5 77.25
20 WDCA 36 28 76.75
22 ???? 21 17 65.75
23 WNVT 22 30.7 79.45
25 ???? 15 16.8 65.55
26 WETA 31 27.5 76.25
27 WAHU 32 26.9 75.65
32 ???? 33 19.8 68.55
35 WRLH 24 31.8 80.55
41 WHTJ 26 22 70.75
44 WZDC 48.75
50 WDCW 15 16.5 65.25
57 ???? 29 28.5 77.25
65 WUPV 8 24 72.75
66 35 17.3 66.05
68 WJAL 9 17.4 66.15
 

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The input signal range in the Avant X is from -20dBmV to 40dBmV. Are you sure that TV is providing dBm and not dBmV already?
 

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Can you filter that list of channels by the channels you are programming in each input, and then screenshots of the configuration screen and adjust?
 

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I think you got the wrong units there. Those levels are way to high to be coming from those preamps, and would be overdriving heavily anyway.
 

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So if the levels are dBmV, can you provide a quick list of the channels you are wanting to select off each antenna?. Worth mentioning too that what you need to program in the Avant X are actual RF channels, not frequencies.
 
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