[SixClub] FM simplex

[CBoone]

500 kHz vs 1.7 MHz split notes (I would have preferred 1.6 like 220 with
even 20 kHz channels...that way EVERYONE has to move and there is no bias :)
==== (my article at 6mt.com has more info on this..and if anyone would like
the see the updated version with a good chart showing proposed in/outs, I
would be happy to send it)

500k splits puts users xmt and rcvr all over the band as well as simplex
channels all over the place...xmt from 51.0 to 53.5 and rcv from 51.5 to 54
(that's what you get when you base a late 20th century bandplan on 40yr old
Motracs!)

1.7Mhz instead puts ALL user xmt below 52.8 MHz....thus the xmtr and antenna
only has to cover 51-52.8....rcv would be 52.3 - 54 (and ALL simplex would
be in the middle centered around 52.5! This makes it easy for the USER
antenna especially the mobile ones to work ok across the entire rptr input
range...rcving? SWR is not that much of an issue...and you don't notice the
difference anyway.

Other bands:
10mtrs is all -100 kHz
2 is mostly 600k offset (with some 1 Megs and oddballs in certain areas like
NYC and LA)
220 is 1.6 Mhz offset (WAS originally 3 Meg offset...until docket 20282
reduced the rptr subband to 222-225 in the 70s!..a lot of folks never know
that or have forgotten!)
UHF is 5 Mhz offset....though channel spacing and direction of offset may
differ...

6 is the ONLY one with NO national offset....with this being the 21st
century, its time to base a NATIONAL plan on TODAY's technology, NOT 30-40
years ago....BTW MACC areas (NW and Central US) is on the 1.7 split....500
split is in the minority... The 1.7 MHz split allows 1MHz split users to
migrate easily (only the input is changed...and they can run dual inputs
during the changeover)...

But the way the 500 kHz plan was shoved down the ARRL VRAC throat was not
proper...and with NO polling of members or ANY six meter op outside CA...You
can read the story in QST that is mentioned in my article on the 6mt.com
site for all the details...and when the ARRL DID finally do a poll, the
500kHz plan LOST by a LARGE majority (I have copies of all the poll
answers...they were provided by ARRL HQ)

When presented with the facts, people still refuse to give in though....and
thus 6mtr is the mess it is...
(BTW the original 6m plan called for 600 K offsets because FM was not
allowed below 52.5; hence that's why 52.525 came into being....but that
split was not followed all the time...some rptrs used 52.76 in/52.525 out or
52.64in/52.525 out..We did have a 53.12in/52.525 out rptr in Beaumont, TX in
the 70s; WR5AJW, later WA5EFI...Until the -1Meg offset plan in the 1980s,
52.525 was used as a rptr output....can you imagine 146.52 or 29.6 used as a
permanent rptr output???....yes I know the crossbanders from 2m to
29.6...now if they would just turn them OFF when NOONE is on it!! I hate
hearing IMD being passed onto 10 from the 2m side AND no ID as required by
Part 97.....luckily not too many 52.525 systems like that exist....except
one in Texas that is a big mouth alligator and ties up 52.525 with a linked
rptr network!)

Chris
WB5ITT

> -----Original Message-----
> From: sixclub-bounces at mailman.qth.net 
> [mailto:sixclub-bounces at mailman.qth.net] On Behalf Of Gabriel Sierra
> Sent: Monday, May 16, 2005 7:59 AM
> To: Mike (KA5CVH) Urich; World Wide Six Meter Club
> Subject: Re: [SixClub] FM simplex
> 
> Hi all,
> 
> I don't know what is the problem with the 0.5 meg splits, 
> really. It has not been hard to implement here in FK68 land, 
> and it gives more RPT channels, and that is important because 
> the band is small, let alone the FM portion. I think it is a 
> more efficient use of the spectrum, but that is just my 
> opinion, for what it is worth! That aside, a national plan is 
> a good idea. It is hard to figure out the RPT split in 
> different regions when you travel. The problem with a 
> national plan implementation is that not all will want to 
> play into it for one reason or another, so, things will 
> pretty much stay the same.