Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 785A6380000B2; Tue, 26 Jun 2012 13:53:01 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SjZvk-0006kk-TW for rs_out_1@blacksheep.org; Tue, 26 Jun 2012 18:52:00 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SjZvk-0006kb-2h for rsgb_lf_group@blacksheep.org; Tue, 26 Jun 2012 18:52:00 +0100 Received: from blu0-omc1-s3.blu0.hotmail.com ([65.55.116.14]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1SjZvi-0008RB-1w for rsgb_lf_group@blacksheep.org; Tue, 26 Jun 2012 18:51:58 +0100 Received: from BLU163-W51 ([65.55.116.7]) by blu0-omc1-s3.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Tue, 26 Jun 2012 10:51:56 -0700 Message-ID: X-Originating-IP: [88.109.102.87] From: Gary G4WGT To: LF Group Date: Tue, 26 Jun 2012 18:51:55 +0100 Importance: Normal In-Reply-To: <1340728957.15592.YahooMailNeo@web171601.mail.ir2.yahoo.com> References: <002801cd536e$76b08400$0401a8c0@xphd97xgq27nyf> <172D1CB5F32F43A790DBC99A73F73D59@AGB>,<1340728957.15592.YahooMailNeo@web171601.mail.ir2.yahoo.com> MIME-Version: 1.0 X-OriginalArrivalTime: 26 Jun 2012 17:51:56.0678 (UTC) FILETIME=[60D37A60:01CD53C4] X-Spam-Score: 1.6 (+) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi All, Pete M0FMT wrote :-When I were a Jate we only had one xtal and a QQV02-6 on 432.00 amplitude modulated on the plate in the good old days. That was my very first transmitter.....And don't forget...."Tuning high to low for a reply". That takes me back :-) 73, Gary - G4WGT. Date: Tue, 26 Jun 2012 17:42:37 +0100 From: Re: LF: A/G FREQS [...] Content analysis details: (1.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [65.55.116.14 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (g4wgt[at]tiscali.co.uk) 1.6 SUBJ_ALL_CAPS Subject is all capitals -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: a44b221381f32eba3e5127fadf77bc3d Content-Type: multipart/alternative; boundary="_69ccadac-9a2a-43dc-96e6-f8aedb58d626_" Subject: RE: LF: A/G FREQS X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.4 required=5.0 tests=FORGED_HOTMAIL_RCVD,HTML_30_40, HTML_MESSAGE,SUBJ_ALL_CAPS autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:471508384:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d618a4fe9f6fd0715 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --_69ccadac-9a2a-43dc-96e6-f8aedb58d626_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi All=2C Pete M0FMT wrote :-When I were a Jate we only had one xtal and a = QQV02-6 on 432.00 amplitude modulated on the plate in the good old days. Th= at was my very first transmitter.....And don't forget...."Tuning high to lo= w for a reply". That takes me back :-) 73=2C Gary - G4WGT. Date: Tue=2C 26 Jun 2012 17:42:37 +0100 From: m0fmt@yahoo.co.uk To: rsgb_lf_group@blacksheep.org Subject: Re: LF: A/G FREQS Well Graham when I were a Jate we only had one xtal and a QQV02-6 on 432.00= amplitude modulated on the plate in the good old days. After all its just = the product of mixing two frequencies 432 with audio in a nonlinear device = like a Class C amp works from almost DC to light!. Nowerdays I guess you wo= uld PWM the carrier on the PA gate/ base producing the same effect and usin= g considerably less power over all. Class E an all. 73 es GL Pete M0FMT IO91UX From: Graham To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday=2C 26 June 2012=2C 17:09 Subject: Re: LF: A/G FREQS =20 =20 =20 Steady on Mal ! this is getting technical =20 !" =20 Your right =2C FM has a cut off point =2C=20 where demodulation fails and also a capture =20 effect =2C where the stronger of 2 signals will =20 acquire and hold the demodulator ..always =20 fun on 2 mtrs when a mobile suddenly =20 takes the channel=20 =20 Am has no cut off point =2C but gradual =20 degradation until the recovered audio is no longer=20 usable ......eg=2C mcw would readable much =20 lower than AM speech=20 =20 I think much over 250/300 MHz its =20 actually not possible to produce AM =2C could=20 be wrong =2C but there is a limit =2C may =20 be by high level modulation falls over =2C dont =20 see why could not be via transverting =20 .......=20 =20 G.. From: mal hamilton=20 Sent: Tuesday=2C June 26=2C 2012 8:36 AM To: rsgb=20 Subject: LF: A/G FREQS As stated Air/Ground vhf/uhf is AM and=20 simplex working. I have also noticed a well modulated AM transmitter=20 is more potent than a FM transmitter when working at max range. On AM the R= X=20 bandwidth can be opened up to receive several stations simultaneously then= =20 select the one of interest by closing down the selectivity=2C the same appl= ies on=20 CW. On FM if you tried this the transmission would fall into a black=20 hole=2C in other words the FM rx has to be tailored to the=20 exact bandwidth of the transmission (same deviation value) g3kev =20 = --_69ccadac-9a2a-43dc-96e6-f8aedb58d626_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi All=2C
 =3B
Pete M0FMT wrote :-
When I were a Jate we only = had one xtal and a QQV02-6 on 432.00 amplitude modulated on the plate in th= e good old days.
 =3B
That was my very =3Bfirst transmitter..= ...And don't forget...."Tuning high to low for a reply".
 =3B
Tha= t takes me back =3B :-)
 =3B
73=2C
 =3B
Gary - G4WG= T.

 =3B
Date: Tue=2C 26 Jun 2012 17:42:37 +0100
From: m0fmt@yahoo.= co.uk
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: A/G FREQS
=
Well Graham when I were a Jate we only had one xtal and a QQ= V02-6 on 432.00 amplitude modulated on the plate =3Bin the good old day= s. After all its just the product of mixing two frequencies 432 with = =3Baudio in a nonlinear device like a Class C amp works from almost DC to l= ight!. Nowerdays I guess you would PWM the carrier on the PA gate/ base pro= ducing the same effect and using considerably less power over all. Class E = an all.
73 es GL Pete M0FMT IO91UX
From: = Graham <=3Bg8fzk@g8fzk.fsnet.co.uk>=3B
To: rsgb_lf_group@blacksheep.org
Sent: Tuesday=2C 26 June 2012=2C 17:09=
Subject: Re: LF: A/= G FREQS

=20 =20
Steady on Mal ! =3B =3B this =3B is getting =3B techni= cal =3B=20 !"
 =3B
Your =3B right =3B =2C FM has a =3B cut off =3B point&= nbsp=3B =2C=20 where =3B demodulation fails =3B and =3B also =3B a =3B= capture =3B=20 effect =2C where the =3B stronger of =3B 2 signals =3B will&nbs= p=3B=20 acquire =3B and =3B hold the =3B demodulator ..always =3B&n= bsp=3B=20 fun =3B on 2 =3B mtrs =3B =3B when a =3B mobile =3B= suddenly =3B=20 takes =3B the =3B channel
 =3B
Am =3B has no =3B cut off =3B point =2C but =3B gradua= l =3B=20 degradation =3B until the =3B recovered =3B audio =3B is no=  =3B longer=20 usable =3B ......eg=2C  =3Bmcw =3B would =3B readable = =3B much =3B=20 lower =3B than =3B AM speech
 =3B
I think =3B much over =3B 250/300 MHz =3B =3B its = =3B=20 actually =3B not =3B possible to =3B produce =3B AM =3B= =2C could=20 be =3B wrong =3B =2C but =3B there is a =3B limit =3B = =2C may =3B =3B=20 be =3B by =3B high =3B level =3B modulation falls over =2C = dont =3B=20 see =3B why =3B could =3B not =3B be =3B via =3B tr= ansverting =3B=20 .......
 =3B
G..
Sent: Tuesday=2C June 26=2C 2012 8:36 AM
To: rsgb
Subject: LF: A/G FREQS

As stated Air/Ground vhf/uhf is AM and=20 simplex =3Bworking.  =3BI have also noticed a well modulated AM tra= nsmitter=20 is more potent than a FM transmitter when working at max range. On AM the R= X=20 bandwidth can be opened up to receive several stations simultaneously then= =20 select the one of interest by closing down the selectivity=2C the same appl= ies on=20 CW.  =3BOn FM if you tried this the =3Btransmission would fall into= a black=20 hole=2C in other words the =3BFM rx has to be tailored to the=20 exact =3Bbandwidth of the transmission (same deviation value)
g3kev
 =3B


= --_69ccadac-9a2a-43dc-96e6-f8aedb58d626_--