If you are using the high and common ports and it blocks 13, they sent you the wrong thing or it is defective.
It doesn't need to be power passing if it is between the antenna and the input of a preamp if you use one. I have never been impressed with that brand; why didn't you buy one that I suggested? A good HLSJ doesn't block UHF coming in the high port. http://forum.tvfool.com/attachment.p...0&d=1447018218 http://forum.tvfool.com/attachment.p...1&d=1447018564 |
I only had a few bucks in PayPal so I got the cheapest on Ebay. Who has the best shipping prices for a small item like this?
Do you happen to know what is inside an HLSJ? I found this thread on FM Traps. I'm just curious. I could probably make one, or at least the high-pass half. I'm trying an FM trap now. |
What good is cheap shipping if you got the wrong thing?
What FM trap are you trying? |
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Good test to confirm that your HLSJ is NOT doing what it should.
The original MCM FM filter is a good one, but is hard to find now. http://www.amazon.com/In-Line-Trap-N.../dp/B00EIAFHLK Radio Shack discontinued their FM trap and Antennas Direct is running low on stock, and will not be replaced. Even HLSJs are getting hard to find. All that will be left is DIY or custom built. https://www.google.com/?gws_rd=ssl#q...ematic+diagram The Radio Shack FM filter has poor attenuation at the 88 MHz end to protect TV channel 6, but good attenuation at the 108 MHz end. The AD filter is just the opposite. Neither one would be good for you because you have strong signals at both ends. http://forum.tvfool.com/attachment.p...0&d=1441159109 Your test results sound like you are on the right track. |
Rabbit73, I think I was editing when you sent that last post. I added a picture (wish I could show the picture or a thumbnail.
What I'm hoping to find out is I can raise the antenna higher now. I think maybe the FM interference was increasing with antenna height also and overloading the tuner. Thanks everyone. I'll post updates when I find out. |
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http://forum.tvfool.com/attachment.p...0&d=1460398508 This is what the MCM FM Trap looks like inside: http://forum.tvfool.com/attachment.p...1&d=1460417400 diagram http://forum.tvfool.com/attachment.p...2&d=1460417425 Quote:
Here is a DIY 5-pole Diplexer, AKA UVSJ: http://forum.tvfool.com/attachment.p...4&d=1460419288 DIY photos http://www.is0grb.it/duplexer/ DIY 3-pole HLSJ; 5-pole would be better: http://forum.tvfool.com/attachment.p...5&d=1460422427 source: http://www.electro-tech-online.com/t...ircuit.122182/ post #12 http://www.electro-tech-online.com/t.../#post-1008775 |
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Thanks for the information. I looked inside the HLSJ I got and the component values are more consistent with UHF/VHF splitter. I left the low side alone and put a 5 pole chebyshev on the high side. 160 MHz gave me convenient values.
Part Values Part Chebyshev 0.1 DB L1 0.048 uH L2 0.048 uH C1 10.19 pF C2 5.92 pF C3 10.19 pF http://forum.tvfool.com/attachment.p...0&d=1460598659 http://forum.tvfool.com/attachment.p...1&d=1460601448 |
I'm not sure where to go from here. I can buy 2 HLSJ's to replace my homemade FM trap and modified HLSJ but I don't think it will matter . What works best is to have a filter, amplifier, and then a second filter. The amp is a RS 15-1108 that is supposed to have an outdoor amp, which I don't have. I'm still thinking of buying a better outdoor matching transformer. I can get all the channels I want on the RCA converter box but not without moving the antenna a few degrees. The strange part is that the direction doesn't correspond with the report. I'm going to use virtual channel numbers for a minute. If I have the antenna pointed at 3,13, and 29, I have to turn it counter clockwise to get 8 and 11. They should be clockwise. Channels 3 and 30 actually have 2 strong points. Raising the antenna higher decreases the weak signals. This still doesn't make sense unless the roof is acting as a reflector.
So, what is an easy way to rotate an antenna without digging it into the ground while rotating? Put it in a bigger pipe? I can reach it through an open window. If I added a second antenna, can I just use a splitter in reverse or do I need to separate the frequencies? |
Please limit the width of your photos to about 800 pixels. I have a hard time reading your posts when they are so wide.
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Thanks. I looked for a ground and didn't find anything close. The fence post wouldn't be very good so I guess I'll have to get a ground rod. On the bright side, I found some additional mast so I could easily go to 30 feet. I would be worried at anything higher because guy wires are not possible here.
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One time I did a test setup with the antenna and preamp connected to a 4-way splitter and then to two converter boxes, two 8-inch monitors, a Sony 22-inch LCD TV, and signal level meter. This was a temporary setup to compare the sensitivity of the tuners using a step attenuator to bring the signals to the digital cliff. The antenna coax was not grounded.
When I touched the coax and the metal strip on the edge of the counter I felt a mild shock. I investigated further and found that what I felt was the sum of the leakage currents from all of those AC operated devices. The leakage current measured about 200 uA; not a dangerous amount but enough to be felt. I connected a wire only to the grounding pin of a 3-wire plug (no connection to the other pins), connected the other end of the wire to the splitter case, and inserted the plug into a properly wired 3-wire outlet. This connected the coax shield to the house electrical system ground. The leakage current then measured zero. So, I'm very particular about grounding the coax shield to the house electrical system ground with a grounding block for personal electrical safety AND to reject interference. Case history: http://www.digitalhome.ca/forum/81-o...ml#post1457594 http://www.digitalhome.ca/forum/81-o...ml#post1457668 |
I don't disagree with you on grounding, as I have a background in electronics and measurement. I just haven't found one yet. As a matter of fact, I found more problems. I did some checking with my multimeter and there is 60 VAC between my PC case and the LCD TV. Both are plugged in to different 3 prong outlets. There is no ground wire on either outlet. This is a very old house.
I'm hoping I will find a cold water pipe just inside the basement by the antenna. Hopefully, that's how the electric service is grounded. I'll ground the coax and mast and then see about the rest. |
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http://www.repairfaq.org/sam/safety.htm#saftes Manual http://www.simpsonelectric.com/image...9-2_manual.pdf Quote:
Please make some leakage current tests soon. http://www.mdsr.ecri.org/summary/det...px?doc_id=8285 |
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Good question. I don't know why; the specs look the same.
http://www.rabbitears.info/tvq.php?r...tems&facid=417 http://www.rabbitears.info/tvq.php?r...ms&facid=71280 The only difference I can see is the frequency of the transmitted signal. |
The TV Fool report is consistent with my actual reception, too. I wonder if one antenna is higher on the tower or if the different frequencies propagate differently.
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Well, I'm about to give up. I have moved this antenna up, down and even back a few feet. That is about 15 ft. in the picture but I have tried as high as 25 ft. It works better when the antenna is lower than the flue pipe. Some things just don't make sense. When cars go by, the signal changes. WCHS gets lost by lowering it. WOWK and WVAH get lost by raising it. WOWK has a decent signal when it breaks up or cuts out. I'm thinking multipath? Is there anything in the picture that screams "fix me"? If not, what antenna do I need that is reasonably priced?
http://forum.tvfool.com/attachment.p...9&d=1461469415 By the way, I have looked this antenna over a few times and I'm still curious how it works. It looks like an LPDA but I'm not sure. I do know that each of the 3 sets of VHF elements is resonant at 2 frequencies. The first set is a full wave on channel 13 but 1/2 wave around 105 MHz. The third set is 1/2 wave at Channel 2 but a full wave at 108 MHz. It would probably be better for me to have an antenna that is made for UHF and High VHF that is not designed for VHF low at all. There would be less to filter out. |
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Here are a few links to check out: http://www.mcmelectronics.com/produc...-2475-/30-2475 http://www.mcmelectronics.com/produc...-2476-/30-2476 http://www.mcmelectronics.com/produc...-2370-/30-2370 http://www.mcmelectronics.com/produc...-2430-/30-2430 There are not many choices out there for VHF-Hi antennas, but there are other brands of the UHF antennas you could check out that may have better build quality. You could also look at a combination VHF-Hi/UHF antenna but I think you would be best served with the highest possible gain on UHF that you can get. |
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What is your present connection system? Ant > grounding block > HLSJ > tuner ? You should get WOWK with that. Once you have that you can try some experiments with an antenna with more gain, another filter, and a preamp for WCHS. Ant > UVSJ > NF-471 > preamp > grounding block > power inserter > tuner The antenna would be a UHF antenna with more gain like the 91XG The UVSJ blocks FM and VHF-High but passes UHF The NF-471 Notch Filter blocks UHF channels 24-29 to make 26 much weaker to keep the preamp from being overloaded by 26 |
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