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TMA-MHA tetra - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


tomsk45
Post subject: TMA-MHA tetra Posted: Wed Jul 12, 2006 5:52 pm

Lieutenant

Joined: Wed Jul 12, 2006 5:26 pm
Posts: 3
Where should the values lie? Parameter for the good RX/TX
TMA. RX 380-385, TX 390-395

Noise
OIP3
P1dB
RX Rejection
TX Rejection
Time Delay
Bypass-loss
Insertion-Loss
Intermodulation
Ripple in Rx-band
Gain variation over temperature
Duplexer 70dB for 5MhZ is okay?
Bandpass Ripple
Speed max 350kmh

Tetra 380MHz (25kHz), Power Handling max. 8x45dBm, Gain 15-20dB, BTS Sensity static -119dBm, Mine english is very bad, apology.


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nubbage
Post subject: TMA-MHA tetraPosted: Thu Jul 13, 2006 6:21 am

General


Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
Hi Tomsk

Check out specs for eqipment by Tait (of New Zealand), Motorola (who now no longer supply to Europe due to RoHS) and Nokia/EADS

Looking at your list, a main concern would be IP3 products for 8 channels running 45dBm Tx output one one mast. Check out these combos by going thru all possible 2*F2-F1 combinations looking for any IP3 products that fall in the receive part of the band.

Other parameters should drop out of manufacturers specs


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tomsk45
Post subject: Posted: Thu Jul 13, 2006 7:32 am

Lieutenant

Joined: Wed Jul 12, 2006 5:26 pm
Posts: 3
That is not exactly the point, I knows (has) manufacturers of values, and I must have a good TMA. Therefore where the parameters are to lie in sentence by sentence? Me would help also the parameters of Motorola or R&S TMA.

thanks


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tomsk45
Post subject: zolotarev?Posted: Wed Aug 16, 2006 4:29 am

Lieutenant

Joined: Wed Jul 12, 2006 5:26 pm
Posts: 3
would it be better if one by means of the LPZ470 (http://www.profilant.net/uk/combiner/12070500) everything cuts off upward? thank you


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nubbage
Post subject: TMA-MHA tetraPosted: Thu Aug 17, 2006 6:07 am

General


Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
You need to consult the TETRA Specifications published by ETSI
They are complicated but contain all the details you requested.



Posted  11/12/2012
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