Poor and Sporadic Reception

[grahamlthompson]

chickenlegs – 26 mins ago  » 

“You might have mentioned you have two amplifiers in series.” I had mentioned this in my original post…”The aerial cable that comes from the external aerial is connected to a Maxview masthead amplifier MHA26U and in turn, connected to a Signal Booster, SLx TV Amplifier Four Output 27820BMR.”

I have not “removed the power to masthead amplifier” – In the test, I did not connect the Humax nor TV to it at all – I described this in my reply. The power supply was not “in the feed to the TV” the set up was exactly the same for both scenarios.

So your test had around 10-20dB of amplification in the feed to the Humax which makes it useless. The whole idea is to test the signal from the aerial to the Humax without amplifying it all let alone two in series. If you want to test it this way without removing the masthead you need to be able to reduce the signal level using the variable attenuator.

[Anonymous]

Does this not clarify exactly what chickenlegs has done (it’s at the top of post #12 in which he quotes his results.

chickenlegs – 2 hours ago  » 

Hello again. So I have managed to detach the external aerial cable from all boosting device (including the masthead amplifier (MHA) and divert this directly to the Humax.

So not quite sure where GLT gets the 10-20dB of gain from in post #16?

[grahamlthompson]

Trev – 5 hours ago  » 

Does this not clarify exactly what chickenlegs has done (it’s at the top of post #12 in which he quotes his results.

chickenlegs – 2 hours ago  » 

Hello again. So I have managed to detach the external aerial cable from all boosting device (including the masthead amplifier (MHA) and divert this directly to the Humax.

So not quite sure where GLT gets the 10-20dB of gain from in post #16?

Very selective – the op totally failed to post the detailed reception from this post,

https://myhumax.org/forum/topic/poor-and-sporadic-reception#post-74105

Merely detailing the the transmitter without any indication of the likely reception conditions.

https://myhumax.org/forum/topic/poor-and-sporadic-reception/page/2?quote=74132#postform

Without a location within a close distance of the OP’s location how can anyone have a clue as to the the likely signal strength.

Basically ignoring the previous requested info. I have to ask is the weak signal due to location or down to the previously not declaring the fact that he used a masthead amp with a gain of generally 10-20dB plus a second amp in series that post DSO would strongly indicate a strong possibility that the issue is as suspected. That’s why I posted the link regarding the use of amplifiers re passive splits.

Had the OP posted more detailed info initially especially regarding multiple amplification that may have been required pre-DSO power increases we might have had a enough info to be able to be able to give a more reasoned opinion as to the likely reasons. Especially as to the detailed DTG reception predictions and the location of the OP.

I use a loft aerial on Lark Stoke which is approx SE from me. My neighbour is south of me. Moving my loft aerial to the East extremity of my loft so the view misses his roof has resulted in a rock solid signal.

Short wavelength UHF signals can create a large improvement in signal of only a few feet movement of the aerial.

[Anonymous]

Thank you all for your replies and for taking the trouble to consider this issue. As I am unable to fully understand some of the technical content of some of the replies, I think I will have to draw this to a close and ask someone to come and review and test the setup that we have here.

[Author]

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