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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
More at https://en.wikipedia.org/wiki/Driven_and_parasitic_elements The XG14A (no longer available) uses a normal dipole, then. So might go for XG16EW (normal dipole) or RX20A (looks like folded dipole): https://antiference.co.uk/product-category/aerials/ I guess a Group A/K aerial is not...- Newcoppiceman
- Post #54
- Forum: HDR-FOX T2 Freeview Recorder
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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
6 March 1998- Newcoppiceman
- Post #51
- Forum: HDR-FOX T2 Freeview Recorder
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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
The dipole is an X type, rather than a folded one. Please explain "a dipole for the driven element". I can easily restore the LTE filter as it does have F-connectors.- Newcoppiceman
- Post #48
- Forum: HDR-FOX T2 Freeview Recorder
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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Thanks for your comments, and welcome to the group. I still have the spec sheet for the Antiference Extragain range (I have an XG14A - Group A) which states that "Maximum signal transfer from aerial to cable is guaranteed with tuned baluns and resonators". I think that the balun is the...- Newcoppiceman
- Post #47
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
I bought the last one on eBay at £299.95, new (I sold my old Maxpeak about a year ago for £150 - see pic). Designed and manufactured in Sweden with good documentation and likely good support too, it stood out from all the Chinese stuff and the cheaper "finders". Until I read the manual I was...- Newcoppiceman
- Post #42
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
The previous Maxpeak TAM DVB-T meter (didn't decode -T2) had a lot of use around digital switchover, not much thereafter it's true to say. So yes, a bit of an indulgence, but invaluable when trying to troubleshoot reception issues and a reassuring presence in the household. (I just think of...- Newcoppiceman
- Post #39
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Might have been too quick to accuse the RF feed after replacing the PVR yesterday morning if the pic in my post #20, taken at 05:51, was taken while ERP or radiation pattern was affected by those planned engineering works at CP. Heavy rain last night, but no break-up on replacement PVR and...- Newcoppiceman
- Post #37
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Essentially the same thing - it's a term used by RF engineers where the wanted bit is the carrier (rather than a baseband signal, such as audio or video).- Newcoppiceman
- Post #34
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Carrier-to-noise ratio. Shirley you knew that!?- Newcoppiceman
- Post #32
- Forum: HDR-FOX T2 Freeview Recorder
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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
All the above rings true from the extensive research I undertook in the mid-2000s when struggling to get the (then) weak muxes which were side-by-side with the analogue channels. I consulted CAI, DTG and manufacturers' publications and borrowed a Promax from work several times to measure...- Newcoppiceman
- Post #29
- Forum: HDR-FOX T2 Freeview Recorder
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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Will try later. For now, have confirmed +11.0V reaching the preamp.- Newcoppiceman
- Post #26
- Forum: HDR-FOX T2 Freeview Recorder
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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
No. That's probably weather-related co-channel interference, which is what I put the problem down to when it first occurred on the morning of 9 October - has been problematic since then which can't surely be down to CCI. In 10+ years we've only had one previous instance of CCI which I logged...- Newcoppiceman
- Post #24
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
That the HDR-Fox T2 had been working fine for years and that two TVs on the same RF feed seemed untroubled suggested (but didn't prove) that the problem lay with the PVR; the alternative, ie that the signal had degraded sufficiently to seriously trouble the PVR but neither TV, seemed less likely...- Newcoppiceman
- Post #22
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Took this prior to replacing the Humax. Note the quality level (green bars) and signal strength (orange bars). Selecting the same service (Talking Pictures TV) on the TV (ie changing input from HDMI1 to Antenna) produces problem-free pictures and sound. TPTV is on the ARQIVAB/COM6 mux.- Newcoppiceman
- Post #20
- Forum: HDR-FOX T2 Freeview Recorder
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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Indeed. A few hours ago I checked both tuners using the hidden menu option. It's a pity there's no indication of the UHF channel each tuner is tuned to but I did a crash-record of BBC One HD (BBCB/PSB3) and then selected C4 SD (D3&4/PSBS2) to view to ensure they were tuned to different muxes...- Newcoppiceman
- Post #19
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
I note the strength/quality bars of each mux whenever I do a rescan; I manually rescan for UHF22/23/25/26/28/30/35. Typically the readings are 70% strength and 100% quality. That would seem to confirm I'm not overdriving the Humax and is consistent with our (usually) rock-steady reception of...- Newcoppiceman
- Post #17
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Trouble is, there's about 20dB difference in received levels between the weakest and strongest muxes, so I figured I'd risk overdriving the Humax rather than allow the weakest mux to drop below the "digital window" (45-70dBuV) which is what would happen with a 10dB preamp. Over the years that's...- Newcoppiceman
- Post #16
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Very much so - and I'm aware of the problems of intermod distortion, the need for derating, etc. I used a Maxpeak TAM DVB-T meter (which I no longer have) to measure levels at the input to the preamp and at the input to the Humax. Arguably the level is too high on some muxes, but as our...- Newcoppiceman
- Post #13
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Having two tuners complicates matters - you never know which tuner is used for a recording or live viewing, do you? A duff first RF transistor in one of the tuners might explain why the PVR sometimes works ok; a combination of the tuner with poor RF gain and impaired propagation during hours of...- Newcoppiceman
- Post #12
- Forum: HDR-FOX T2 Freeview Recorder
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N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
They differ in that, eg, audio mutes might occur on different words in a sentence but the playback is never clean - picture and sound always breaks-up. Scrub my reference to "recorded-in" - I was still thinking analogue technology; it's basically the raw transport stream that's written to disc...- Newcoppiceman
- Post #10
- Forum: HDR-FOX T2 Freeview Recorder
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Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
More at https://en.wikipedia.org/wiki/Driven_and_parasitic_elements The XG14A (no longer available) uses a normal dipole, then. So might go for XG16EW (normal dipole) or RX20A (looks like folded dipole): https://antiference.co.uk/product-category/aerials/ I guess a Group A/K aerial is not...- Newcoppiceman
- Post #54
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
6 March 1998- Newcoppiceman
- Post #51
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
The dipole is an X type, rather than a folded one. Please explain "a dipole for the driven element". I can easily restore the LTE filter as it does have F-connectors.- Newcoppiceman
- Post #48
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Thanks for your comments, and welcome to the group. I still have the spec sheet for the Antiference Extragain range (I have an XG14A - Group A) which states that "Maximum signal transfer from aerial to cable is guaranteed with tuned baluns and resonators". I think that the balun is the...- Newcoppiceman
- Post #47
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
I bought the last one on eBay at £299.95, new (I sold my old Maxpeak about a year ago for £150 - see pic). Designed and manufactured in Sweden with good documentation and likely good support too, it stood out from all the Chinese stuff and the cheaper "finders". Until I read the manual I was...- Newcoppiceman
- Post #42
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
The previous Maxpeak TAM DVB-T meter (didn't decode -T2) had a lot of use around digital switchover, not much thereafter it's true to say. So yes, a bit of an indulgence, but invaluable when trying to troubleshoot reception issues and a reassuring presence in the household. (I just think of...- Newcoppiceman
- Post #39
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Might have been too quick to accuse the RF feed after replacing the PVR yesterday morning if the pic in my post #20, taken at 05:51, was taken while ERP or radiation pattern was affected by those planned engineering works at CP. Heavy rain last night, but no break-up on replacement PVR and...- Newcoppiceman
- Post #37
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Essentially the same thing - it's a term used by RF engineers where the wanted bit is the carrier (rather than a baseband signal, such as audio or video).- Newcoppiceman
- Post #34
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Carrier-to-noise ratio. Shirley you knew that!?- Newcoppiceman
- Post #32
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
All the above rings true from the extensive research I undertook in the mid-2000s when struggling to get the (then) weak muxes which were side-by-side with the analogue channels. I consulted CAI, DTG and manufacturers' publications and borrowed a Promax from work several times to measure...- Newcoppiceman
- Post #29
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Will try later. For now, have confirmed +11.0V reaching the preamp.- Newcoppiceman
- Post #26
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
No. That's probably weather-related co-channel interference, which is what I put the problem down to when it first occurred on the morning of 9 October - has been problematic since then which can't surely be down to CCI. In 10+ years we've only had one previous instance of CCI which I logged...- Newcoppiceman
- Post #24
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
That the HDR-Fox T2 had been working fine for years and that two TVs on the same RF feed seemed untroubled suggested (but didn't prove) that the problem lay with the PVR; the alternative, ie that the signal had degraded sufficiently to seriously trouble the PVR but neither TV, seemed less likely...- Newcoppiceman
- Post #22
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Took this prior to replacing the Humax. Note the quality level (green bars) and signal strength (orange bars). Selecting the same service (Talking Pictures TV) on the TV (ie changing input from HDMI1 to Antenna) produces problem-free pictures and sound. TPTV is on the ARQIVAB/COM6 mux.- Newcoppiceman
- Post #20
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Indeed. A few hours ago I checked both tuners using the hidden menu option. It's a pity there's no indication of the UHF channel each tuner is tuned to but I did a crash-record of BBC One HD (BBCB/PSB3) and then selected C4 SD (D3&4/PSBS2) to view to ensure they were tuned to different muxes...- Newcoppiceman
- Post #19
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
I note the strength/quality bars of each mux whenever I do a rescan; I manually rescan for UHF22/23/25/26/28/30/35. Typically the readings are 70% strength and 100% quality. That would seem to confirm I'm not overdriving the Humax and is consistent with our (usually) rock-steady reception of...- Newcoppiceman
- Post #17
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Trouble is, there's about 20dB difference in received levels between the weakest and strongest muxes, so I figured I'd risk overdriving the Humax rather than allow the weakest mux to drop below the "digital window" (45-70dBuV) which is what would happen with a 10dB preamp. Over the years that's...- Newcoppiceman
- Post #16
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Very much so - and I'm aware of the problems of intermod distortion, the need for derating, etc. I used a Maxpeak TAM DVB-T meter (which I no longer have) to measure levels at the input to the preamp and at the input to the Humax. Arguably the level is too high on some muxes, but as our...- Newcoppiceman
- Post #13
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
Having two tuners complicates matters - you never know which tuner is used for a recording or live viewing, do you? A duff first RF transistor in one of the tuners might explain why the PVR sometimes works ok; a combination of the tuner with poor RF gain and impaired propagation during hours of...- Newcoppiceman
- Post #12
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Faulty Preamp PSU Caused Humax Reception Problems on Some Muxes
They differ in that, eg, audio mutes might occur on different words in a sentence but the playback is never clean - picture and sound always breaks-up. Scrub my reference to "recorded-in" - I was still thinking analogue technology; it's basically the raw transport stream that's written to disc...- Newcoppiceman
- Post #10
- Forum: HDR-FOX T2 Freeview Recorder