Ft-1000mp Inrad roofing filter

[S52OW]

Teden je okoli, odkar sem vgradil Inradov roofing filter.

-Sprejemam 8khz stran od postaje, ki ima brez priklopljene antene jakost signala 9+45db (moj sosed s59pc+linear). Seveda sem 8khz stran anteno imel priklopljeno in sprejemal dokaj šibke signale brez težav.

-2khz stran kakšne razlike ne opazim, saj je filter širok 4khz, vendar pa so rezultati s shift in widht potenc... res dobri. Se pravi 2khz stran in zamik s shiftom....zmaga. Naprej ni težav.

-NB v špicah popači signal mnogo manj.

Toliko zaenkrat.

73, s57oww de Tilen

[s56a]

Februarska stevilka ARRL QST ima test Inrad filtera. Ugotovitve so podobne Tilenovim kar samo potrjuje sibkost drugega mesalnika.

[S52OW]

Mario Živjo.
Torej Roofing filter reši "šibkost" drugega if-a. Hm, morda bi kakšen dober filter še dodatno pripomogel na drugi in tretji stopnji??

73, Tilen

[s56a]

Ko drugi mesalnik zasustra z IMD3, noben sledilni filter vec ne pomaga!

[S52OW]

Mario, ali imaš dostop do tega članka?
Zadevo so zgleda pozitivno ocenili:

The new [ Feb 2005 ] QST has a nice and positive review of the Inrad
roofing filter with sensitivity, IMD, and blocking performance
numbers for 20, 5, 2, and 1 khz bandwidths. It is available for
members at the arrl.org website. You might want to check it and and
get your order in for one if you like what you read. I think Inrad
is going to be swamped with orders [more so than now] in the near
future. --- Steve KK9ZZ

73, TIlen

[S50U]

Mario, ali imaš dostop do tega članka?

Če članek rabiš mi daj email. (PDF cca. 444kb)

Tom Frenaye, K1KI
Director, ARRL New England Division

During the K1KI multioperator-single transmitter effort in the October CQWW SSB Contest, we used one FT-1000MP without and one Mark V FT-1000MP with the International Radio roofing filter. They were used on several bands during the weekend. For the single operator November ARRL Sweepstakes CW contest an FT-1000MP with the roofing filter was used as the main radio, and one without the roofing filter was used as a second radio. In trying to figure out what could be said about the radio’s performance with the roofing filter, what stands out is what doesn’t happen. In the past when there were very loud signals (S9+20 dB or so) on the band, we’d often hear extra IMD products on our frequency, even if the loud signals were 10 to 20 kHz away. With the roofing filter installed, we just don’t hear them at all, unless they are very close in frequency. Listening to other stations on CW or SSB is less stressful without the extra noises! When looking for a clear spot on 40 meter SSB, the radio with the roofing filter is able to find more “holes” between the S9+40 dB international broadcast stations, and able to copy other stations that would not have been heard in the past. After the first Ten-Tec Orions hit the bands in late 2003, there were several times when good friends with new Orions seemed to start up too close to our frequency. It turned out they couldn’t even hear us. It became clear that the performance of that radio was superior to the FT-1000MPs used here. With the International Radio roofing filter, the situation seems to be back to even again in the never-ending goal to keep up with the competition!

HNY 2005 Danilo, S50U

[S52OW]

Hvala Danilo. Review sem že dobil...Tnx Mario.
Še za tiste, ki jih skrbi obseg sprejema z novim filtrom.
V meniju 5-0 lahko se lahko z nastavitvijo 8,2-445 "izognemo" vgrajenemu Inradovemu filtru in sprejemamo 6khz...(za lo-fu audio uživače)...v nor poziciji. V nar1 poziciji pa se priklopi spet tudi Inrad.

73, Tilen

SREČNO 2005

[S52OW]

Tale odgovor sem dobil iz Inrada okoli filtrov za Markv.

Hello Tilen,

We'd recomend the #702C and the #709-B -- both 2.1 kHz. The #702 is a
crystal filter -- better than the #720 mechanical filter.

However, the BEST selectivity is a pair of 1.8 kHz filters: #714-C and
#711-B. The contesters use these.

Thanks for your interest -- 73,
Georgia

Zanima me, če kdo uporablja 1.8khz Inradove filtre na obeh medfrekvencah? Kakšen posnetek morda? Zanima me kako ozek je v praksi...Recimo Kenwoodov 1.8khz je skoraj malo preozek.

73, Tilen

[S52X]

V menuju 5-0 izbiras katere filtre boš kdaj uporabljal. Glede na to da klapa baypass roofinga naredi z releji precej dvomim, da tebi to ratuje brez.

Hvala Danilo. Review sem že dobil...Tnx Mario.
Še za tiste, ki jih skrbi obseg sprejema z novim filtrom.
V meniju 5-0 lahko se lahko z nastavitvijo 8,2-445 "izognemo" vgrajenemu Inradovemu filtru in sprejemamo 6khz...(za lo-fu audio uživače)...v nor poziciji. V nar1 poziciji pa se priklopi spet tudi Inrad.

73, Tilen

SREČNO 2005

[S57S]

V svojem Kenwood TS850S/AT imam med drugimi tudi 1.8 SSB filter,
ki pa ga NIKOLI ne uporabljam, saj se mi zdi ''preozek''. SSB signali so precej bolj ''kovinsko'' obarvani in človeka, vsaj mene, že kratko poslušanje odvrača od uporabe. Preprosto, utujajoče je. Morda v kakšnem primeru uporaba tega ozkega filtra res pomaga in z njim ''potegnete'' šibak DX iz QRM-a, vendar se v mnogo letih nanj nikakor nisem uspel privaditi. Zato dvomim v to, kar pri Inradu pravijo okoli kontestarjev, češ, da te filtre uporabljajo. Prav kontestarji radi poslušamo malo bolj ''na debelo'', če se le da. Tudi na SSB. Seveda pa
je z mojim filtrom morda lahko kaj narobe. Naj še kdo drug kaj napiše na temo uporabe 1.8 kHz filtrov na SSB-ju. Tudi mene stvar zanima.

73, Aleksander, S57S

[S52OW]

Aleksander Živjo.
Kenwodov 1.8khz je bil tudi meni preozek, tudi ko sem sprejem zamaknil v minus (da sem pridobil malo na basih).
Zato me zanima še kako zveni Inradov.

73, Tilen

[S52OW]

Izmerjen Inradov roofing filter proti originalnemu.
http://www.wimo.de/cgi-bin/verteiler.pl ... _inrad.htm

[S52OW]

Sem dokupil Yaesujeva 2khz ssb filtra. Cena 31ksit.
Filtra delata odlično, propust pa je še vedno znosen.