Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 65042380000A2; Thu, 11 Apr 2013 20:07:19 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UQRVC-0001ee-Qc for rs_out_1@blacksheep.org; Fri, 12 Apr 2013 01:06:02 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UQRVA-0001eV-Uy for rsgb_lf_group@blacksheep.org; Fri, 12 Apr 2013 01:06:00 +0100 Received: from nm3.bt.bullet.mail.ird.yahoo.com ([212.82.108.234]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1UQRV5-0006Fs-6p for rsgb_lf_group@blacksheep.org; Fri, 12 Apr 2013 01:05:59 +0100 Received: from [212.82.108.231] by nm3.bt.bullet.mail.ird.yahoo.com with NNFMP; 12 Apr 2013 00:05:33 -0000 Received: from [46.228.39.170] by tm4.bt.bullet.mail.ird.yahoo.com with NNFMP; 12 Apr 2013 00:05:32 -0000 Received: from [127.0.0.1] by smtp111.bt.mail.ir2.yahoo.com with NNFMP; 12 Apr 2013 00:05:32 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=s1024; t=1365725132; bh=evWF2Ehm/2W7g1nufg5AJsebCGvHlklJi+y/eHMYDSc=; h=X-Yahoo-Newman-Id:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:X-Rocket-Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-Antivirus:X-Antivirus-Status; b=PxIR9GQ4Ms1B0NSADpTgmx8ldfCymKmyHSu0uCZZUGQuRE9jH3OV0jJ4joW/SzdLNSrquR3MAoC6iEZ3UWDFy2ong4zfiiVbireMpirBXGZCp6a/jGWQguXrwFzpknbenCixV0CK1WamZPtwXneBTcgte+4nUo+129eSUIiQnQQ= X-Yahoo-Newman-Id: 956744.9364.bm@smtp111.bt.mail.ir2.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: mq7Y0GEVM1kg61JVx3fFoGi71lyY0YSPiGKzByE07cvimyF vMeCOkkURyRmVrE17ipXQkpRu6mWE6Dynr6_XqpkpNqC6oXBLeIFP4DicjoW Pc12ys1FYyUiE8HHpy.b94AOoReG3G7kjFN1Vt8mw4EhdS_3k1JOcDSLOdP8 kOLiJpIc4ZI58IyMMBYs9tz0ZVVwR73a3s9l8zsBLPaYq9VHC5rC86rqfxNs 0cj3gm_PyVJcHk2QNUVzevZL03D0IZqBvixvKb3oSNR1Ma_9OfO0Xz4i8LQh YumRz8QHv5f9EUSYTqWg5M09wY5ykZhugds5cbEvvxP4_qqFU3MjGHiLCTNX J4uxF143a_qwr3AY0xPx58u1.dUxIZ9W86nCpYSGeh4.t64CwJeMWdOIWELj LCDZ3KiipKhKF.s4pQx0Z6EfEfCQBm8XW4gFTny3QOd9J3_QNDMHnk8GDWHq DYiD.k12LaIT7XU8M48FGaeHuqQ6RS_kyBufyOXzMcNvg6.djFhRHbQLozgz wrFLq_zw2GVIgkTdl8PqAFQvS2E1kohFm1zrA5LmO.Z6B8qx3Ug1SJX21nzy NMBdtYMoLn6dv9N3A67V7MFz4.w-- X-Yahoo-SMTP: fpz.2VeswBBs59bVshRPmMN51lcO2lgFRIvE4XTqE8dRwOxd70E- X-Rocket-Received: from gnat (alan.melia@86.149.140.116 with login) by smtp111.bt.mail.ir2.yahoo.com with SMTP; 12 Apr 2013 00:05:32 +0000 UTC Message-ID: <0C39801A58B2410F8B02BE0908F7BF7C@gnat> From: "Alan Melia" To: References: <0D5F8C81FCD24061BCDE1F5E2C9785E7@AGB> <1365633794.18069.YahooMailNeo@web133204.mail.ir2.yahoo.com> <1365673624.52897.YahooMailNeo@web133204.mail.ir2.yahoo.com> <7B14049AB0084B3EB5BA4E6BB153ECB8@AGB> <1365679082.78051.YahooMailNeo@web133205.mail.ir2.yahoo.com> <5166A72E.8080908@aol.com> <1365693636.38927.YahooMailNeo@web133204.mail.ir2.yahoo.com> <5166F8AC.8030304@aol.com> <1365704237.75794.YahooMailNeo@web133203.mail.ir2.yahoo.com> <516714F0.6030405@aol.com> Date: Fri, 12 Apr 2013 00:55:14 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Antivirus: avast! (VPS 130411-1, 11/04/2013), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 2.2 (++) 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 Pat Yes I did send Graham a thought that if he can get the old crystals open he might be able to move them down by "mechanically loading them" the easiest way is adding some mass by plating some copper on them electrolytically. It was done with the FT-243 (or was it 241...I cant remember these days) the one marked "54th harmonic" and that were used for 470kHz IF SSB filters in the 1960s. [...] Content analysis details: (2.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.82.108.234 listed in list.dnswl.org] 2.2 TVD_SUBJ_ACC_NUM Subject has spammy looking monetary reference 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: adf8ef6234b51ce2e0919b03e0f2d475 Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range 236.25 236.75 KHz Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B6_01CE3718.644B1CB0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: **** X-Spam-Status: No, hits=4.9 required=5.0 tests=AMATEUR_PORN, FORGED_MUA_OUTLOOK,HTML_40_50,HTML_MESSAGE 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-AUTHENTICATION: mtain-dg02.r1000.mx.aol.com ; domain : btinternet.com DKIM : pass x-aol-sid: 3039ac1d410a516750377f10 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_00B6_01CE3718.644B1CB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Pat Yes I did send Graham a thought that if he can get the old = crystals open he might be able to move them down by "mechanically = loading them" the easiest way is adding some mass by plating some copper = on them electrolytically. It was done with the FT-243 (or was it 241...I = cant remember these days) the one marked "54th harmonic" and that were = used for 470kHz IF SSB filters in the 1960s. Lapping them with "the famous foaming clenser" ( Ajax scouring powder = for the younger members :-)) ) will only move them up in frequency. = Pete is right. the worst problen with lapping is getting and keeping the = faces parallel. Non-parallelism is the quickest way to lose activity.the = other problem is microscopic chips off the edges. The best way is to = "ring" several similar thickness blanks onto a half inch thick glass = "flat" with hot wax and lap them on a sheet of plate glass. They stay = fairly parallel like that. Etching does help as it removes the damage = layer induced by the lapping. The etch rate slows as you get through the = damage layer, but if you etch too far you can lose activity. This may be = due to rounding the edges but it can alsi e due to leaving microscopic = particles of lapping powder embedded in the surface, sticking up. Proper = lapping compound is very accurately sieved for calibrated grain sizes. = Sometimes a large grain will gouge a minute trough and the etch will = deepen it. Its 50 years now since I was in the crystal lab, and it = always struck me as more of an art than a science. The best techs were = from the optical trade. I believe toothpaste is quite good as a fine = grade lapping compound but I never tried it. Most of the plated crystals were finished by measuring them in the = vacuum chamber whilst evaporating gold onto the electrode areas. They = move a little when mounted up but that can be taken up with the = capacitive loading. A good tech knows where to stop plating to get spot = on the spec. I was an interloper in the lab because I was working on = silicon not quartz :-)) Alan=20 G3NYK ----- Original Message -----=20 From: pat=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, April 11, 2013 8:54 PM Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range 236.25 236.75 KHz I'm glad you've just popped up on this xtal topic Alan. I was just = going to recommend that you be contacted as a probable Guru. 73 On 11/04/13 20:26, Alan Melia wrote: Interesting Pete I didnt get two that time. I had it happen the = other day Idont know whether there is congestion (kids doing holiday = projects) but I hit "send/receive" I got all the receive messages but = got an error on send, and the message wasstill in outbox so I sent it = again......and got two copies from the reflector. So I guess te server = didnt ack the receipt the first time although it did receive the = messages. That's more like BOGOHP :-)) Alan=20 ----- Original Message -----=20 From: M0FMT=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, April 11, 2013 7:17 PM Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range 236.25 236.75 = KHz Pat there's something up with your e-mail because it keeps sending = the same thing twice? i.e. two e-mails for the price of one. 73 es GL Pete M0FMT IO91UX From: pat To: rsgb_lf_group@blacksheep.org=20 Cc: M0FMT =20 Sent: Thursday, 11 April 2013, 18:53 Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range 236.25 236.75 = KHz Well, you might have been happy, Pete. I discovered that the = family cat's whiskers wouldn't work with a bit of coke and we had to go = back to a pair of baked bean cans and string! On 11/04/13 16:20, M0FMT wrote: And we all live in a hole in the road but we were = happy!!.....:0) 73 es GL Pete M0FMT IO91UX From: pat mailto:g4gvw@aol.com To: rsgb_lf_group@blacksheep.org=20 Cc: M0FMT mailto:m0fmt@yahoo.co.uk=20 Sent: Thursday, 11 April 2013, 13:06 Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range 236.25 = 236.75 KHz And Wireless Set No.17 for =A32:19:6 (2Volt accumulator and = HT Battery 10/- extra) And we're all getting older! 73=20 On 11/04/13 12:18, M0FMT wrote: Hi Graham How young you are my introduction to Tottenham Court Road = (Proops?) , Lisles Street (GW Smiths), Charring Cross and The Edgeware = Road about 1956. Aaaaah those were the days. learnt a lot about Radio, = Life, the Universe and everything there...... hee! Got my R107 from Lisle Street with money save from my = apprentices pay. Carried it (abt 1 CWT) via bus to Kings Cross in the = days when the conductor would jump off the bus and give you had to get = it on board........ imagine that on a "Bendy Bus" today. See = http://www.retinascope.co.uk/lislestreet.html for the full story. OK on the stick info yes but I am CW only really can't get = too excited about sterile data although as you know I do partake = occasionally. 73 es GL Pete M0FMT IO91UX From: Graham mailto:g8fzk@g8fzk.fsnet.co.uk To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, 11 April 2013, 11:52 Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range 236.25 = 236.75 KHz=20 R Pete=20 Well , its possible to use the emergency vfo , but = that results in a very unstable signal , I remember down the = Tottenham court road , there where tea chests of crystals , but that = was 1970 .. seems a lot of the traditional firms have closed ,=20 One of the =A35 dds with a driver would work , = but they want to keep it standard=20 DS - That's really the 'correct' situation , that = -33 db decode, -3 db lower than normal was a good indication = that the system is working , over ranging the a/d is the only = problem . I think dynamic range is 60 d b after processing , is it = 3 db per bit ? 8 bits , 24 db + 3 that's 27 dB ? 500:1 ? , = but by removing qty 2 mixers and 2 oscillators , [ may be = 3 oscillators 1 , hf-up-conv 2 , pll conv osc 3 ref osc ) that = is a lot of noise + jitter removed from the signal path as well = as imd from 2 mixers , I found a attenuator helped for mw and = I have a mw-filter , which cleaned up sw bands ...... nice to = have a panoramic display , 2 mhz this time , the ra17 was 1 mhz = and 28 valves + 20 ish > in the radio =20 73-G. From: M0FMT=20 Sent: Thursday, April 11, 2013 10:47 AM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range 236.25 = 236.75 KHz=20 OK Graham Thought it was home brew retro.......... I am in that = mode and think everbody else is! What do you do at the moment inject a = Sig Genny? Have you checked the net or checked out Vincent - = QuartzLab etc?=20 Anyway what's that master osc circuit. I build from old = RADCOM (pre 1975 when they published real amateur radio) and PW,QST = etal. I use modern xtals with no known issues. Well trying to get third = overtone for 10m not to chirp is an issue with me at the moment.=20 OK yes got a stick on its way didn't want to tear up my = existing upconverter design. But not sure there is much wrong with the = UC approach it works for me. But want to try the direct approach. Do you = get much Cross mod and IM products? 73 es GL Pete M0FMT IO91UX From: Graham mailto:g8fzk@g8fzk.fsnet.co.uk To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, 11 April 2013, 0:47 Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range = 236.25 236.75 KHz=20 Ok Pete=20 Q where to have them made ?=20 The set , Marconi Ocean span 1950's valve tx = needs the big rock's as the oscillator pass's quite a lot of = power via them ...hc6u are no good , drive level is very low - the = ones fitted are the wired- gold flashed ones , so cannot etch = into the band ...=20 the gang want to keep it standard=20 73 -G.=20 Ps waiting for qty-3 =A36 dongles : ) From: M0FMT=20 Sent: Wednesday, April 10, 2013 11:43 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Wanted 10XJ or FT243 XTALS Range = 236.25 236.75 KHz=20 Hi=20 If you want to spend a small fortune get them cut. = However build a Mixer VXO from El cheapo standard xtals and or old PMR = rocks. Then at your next rally buy a couple of Screw together 10xj or = FT243 rocks of any frequency and put the El-cheapo xtals inside. And Hey = Presto you have Retro rocks. I have a small all valve 472 tx that uses 6.00 = -6.472=3D0.472 vxo-able a couple of kc/s 12ax7-6am6-6cl6=3D 4wattso/p. = Local QRP rig. Hope this helps 73 es GL Pete M0FMT IO91UX From: Graham mailto:g8fzk@g8fzk.fsnet.co.uk To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, 10 April 2013, 20:30 Subject: LF: Wanted 10XJ or FT243 XTALS Range 236.25 = 236.75 KHz=20 Wanted 10XJ or FT243 XTALS Range 236.25 = 236.75 KHz =20 Q Is there any manufacture of crystals in = this range ? Or Surplus items available =20 QTY 1 or 2 off =20 TNX- Graham G0NBD --=20 73 de pat g4gvw es gd dx qth nr Felixstowe East Coast UK --=20 73 de pat g4gvw es gd dx qth nr Felixstowe East Coast UK --=20 73 de pat g4gvw es gd dx qth nr Felixstowe East Coast UK ------=_NextPart_000_00B6_01CE3718.644B1CB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Pat Yes I did send Graham a thought = that if he=20 can get the old crystals open he might be able to move them down by=20 "mechanically loading them" the easiest way is adding some mass by = plating some=20 copper on them electrolytically. It was done with the FT-243 (or was it = 241...I=20 cant remember these days) the one marked "54th harmonic" and that were = used for=20 470kHz IF SSB filters in the 1960s.
 
Lapping them with "the famous foaming = clenser" (=20 Ajax scouring powder for the younger members :-))  ) will only move = them up=20 in frequency. Pete is right. the worst problen with lapping is getting = and=20 keeping the faces parallel. Non-parallelism is the quickest way to lose=20 activity.the other problem is microscopic chips off the edges. The best = way is=20 to "ring" several similar thickness blanks onto a half inch thick glass = "flat"=20 with hot wax and lap them on a sheet of plate glass. They stay = fairly=20 parallel like that. Etching does help as it removes the damage layer = induced by=20 the lapping. The etch rate slows as you get through the damage layer, = but if you=20 etch too far you can lose activity. This may be due to rounding the = edges but it=20 can alsi e due to leaving microscopic particles of lapping powder = embedded in=20 the surface, sticking up. Proper lapping compound is very accurately = sieved for=20 calibrated grain sizes. Sometimes a large grain will gouge a minute = trough and=20 the etch will deepen it. Its 50 years now since I was in the crystal = lab, and it=20 always struck me as more of an art than a science. The best techs were = from the=20 optical trade. I believe toothpaste is quite good as a fine grade = lapping=20 compound but I never tried it.
 
Most of the plated crystals were = finished by=20 measuring them in the vacuum chamber whilst evaporating gold onto the = electrode=20 areas. They move a little when mounted up but that can be taken up with = the=20 capacitive loading. A good tech knows where to stop plating to get spot = on the=20 spec. I was an interloper in the lab because I was working on silicon = not=20 quartz :-))
 
Alan
G3NYK
----- Original Message -----
From:=20 pat
Sent: Thursday, April 11, 2013 = 8:54=20 PM
Subject: Re: LF: Wanted 10XJ or = FT243=20 XTALS Range 236.25 236.75 KHz

I'm glad you've just popped up on this = xtal topic=20 Alan. I was just going to recommend that you be contacted as a = probable=20 Guru.

73


On 11/04/13 20:26, Alan Melia = wrote:
Interesting Pete I didnt get two = that time. I=20 had it happen the other day Idont know whether there is congestion = (kids=20 doing holiday projects) but I hit "send/receive" I got all the = receive=20 messages but got an error on send, and the message wasstill in = outbox so I=20 sent it again......and got two copies from the reflector. So I guess = te=20 server didnt ack the receipt the first time although it did receive = the=20 messages.
That's more like BOGOHP  = :-))
Alan 
----- Original Message ----- =
From:=20 M0FMT
To: rsgb_lf_group@blacksheep.org
Sent: Thursday, April 11, = 2013 7:17=20 PM
Subject: Re: LF: Wanted = 10XJ or FT243=20 XTALS Range 236.25 236.75 KHz

Pat there's something up with your e-mail because it = keeps=20 sending the same thing twice? i.e. two e-mails for the price of=20 one.
 73 es GL Pete M0FMT IO91UX
From: pat <g4gvw@aol.com>
To: rsgb_lf_group@blacksheep.org =
Cc: M0FMT <m0fmt@yahoo.co.uk>
Sent: Thursday, 11 April = 2013,=20 18:53
Subject: Re: LF:=20 Wanted 10XJ or FT243 XTALS Range 236.25 236.75 = KHz

Well, you might have = been happy,=20 Pete. I discovered that the family cat's whiskers wouldn't work = with a=20 bit of coke and we had to go back to a pair of baked bean cans = and=20 string!




On 11/04/13 16:20, M0FMT = wrote:
And we all live in a hole in the road but we were=20 happy!!.....:0)

73 es GL Pete M0FMT IO91UX
From: pat mailto:g4gvw@aol.com
To: rsgb_lf_group@blacksheep.= org=20
Cc: = M0FMT mailto:m0fmt@yahoo.co.uk=20
Sent: = Thursday, 11=20 April 2013, 13:06
Subject: Re: LF: = Wanted 10XJ or=20 FT243 XTALS Range 236.25 236.75 KHz

And Wireless Set = No.17 for=20 =A32:19:6 (2Volt accumulator and HT Battery 10/- = extra)

And=20 we're all getting older!

73




On = 11/04/13=20 12:18, M0FMT wrote:
Hi Graham
 
How young you are my introduction to Tottenham = Court=20 Road (Proops?) , Lisles Street (GW Smiths), Charring Cross =  and The Edgeware Road  about 1956. Aaaaah those = were=20 the days. learnt a = lot about=20 Radio, Life, the Universe and everything there......=20 hee!
Got my R107 from Lisle Street with money save = from my=20 apprentices pay. Carried it  (abt 1 CWT) via bus to = Kings=20 Cross in the days when the conductor would jump off the = bus and=20 give you had to get it on board........ imagine that on a = "Bendy=20 Bus" today. See http://www.retinascope.co.uk/lislestreet.html for=20 the full story.
 
OK on the stick info yes but I am CW only = really can't=20 get too excited about sterile data although as you know I = do=20 partake occasionally.
73 es GL Pete M0FMT IO91UX
From: Graham mailto:g8fzk@g8fzk.fsnet.co.uk=
To: rsgb_lf_group@blacksheep.= org=20
Sent:=20 Thursday, 11 April 2013, 11:52
Subject: Re: LF: = Wanted=20 10XJ or FT243 XTALS Range 236.25 236.75 KHz =

R Pete
 
Well , its possible to  use the  = emergency =20 vfo  , but that  results  in a very  = unstable  signal , I   remember  = down=20 the  Tottenham court road , there  where  = tea=20 chests of  crystals , but that  was  1970 = ..=20 seems  a  lot  of the  = traditional =20 firms have  closed ,
 
One  of the  =A35  dds  = with  a=20 driver  would  work , but  they  = want=20 to  keep  it  standard
 
DS -   That's really  the =20 'correct'  situation  ,  that  -33 = db=20 decode, -3 db  lower than  normal =  was =20 a  good  indication   that  = the =20 system  is  working ,   over=20 ranging  the  a/d  is the  = only =20 problem . I think  dynamic  range is  60 = d b=20 after  processing  , is it   3 db = per =20 bit  ?  8 bits  , 24  db + = 3  =20 that's   27 dB ?  500:1 ?   ,=20 but   by  removing    = qty =20 2  mixers   and  2 =20 oscillators   , [ may  be 3 =20 oscillators  1 , hf-up-conv  2 , pll  = conv=20 osc  3  ref osc )  that  is a =20 lot  of  noise + jitter  removed  = from=20 the  signal  path as well  as   = imd  from  2  mixers , I found  a=20 attenuator  helped  for  mw  = and  I=20 have  a  mw-filter  , which  = cleaned =20 up  sw  bands  ......  nice to  = have=20 a  panoramic  display , 2  mhz this time = ,=20 the  ra17  was 1 mhz  and   = 28 =20 valves + 20 ish  > in the  radio  =  
 
73-G.
 

From: M0FMT
Sent: Thursday, April 11, 2013 10:47 = AM
To: rsgb_lf_group@blacksheep.= org=20
Subject: Re: LF: Wanted 10XJ or FT243 XTALS = Range=20 236.25 236.75 KHz

OK Graham
 
Thought it was home brew retro.......... I am = in that=20 mode and think everbody else is! What do you do at the = moment=20 inject a Sig Genny?
 
Have you checked the net or checked out = Vincent=20 - QuartzLab etc?
 
Anyway what's that master osc circuit. I = build from=20 old RADCOM (pre 1975 when they published real amateur = radio) and=20 PW,QST etal. I use modern xtals with no known issues. = Well=20 trying to get third overtone for 10m not to chirp is an = issue=20 with me at the moment. 
 
OK yes got a stick on its way didn't want to = tear up=20 my existing upconverter design. But not sure there is = much wrong=20 with the UC approach it works for me. But want to try = the direct=20 approach. Do you get much Cross mod and IM=20 products?

73 es GL Pete M0FMT IO91UX
From: Graham mailto:g8fzk@g8fzk.fsnet.co.uk=
To: rsgb_lf_group@blacksheep.= org=20
Sent:=20 Thursday, 11 April 2013, 0:47
Subject: Re: = LF: Wanted=20 10XJ or FT243 XTALS Range 236.25 236.75 KHz =

Ok Pete
 
Q where to  have  them  made  = ?=20
 
The  set  , Marconi  Ocean span=20 1950's  valve  tx   needs  = the =20 big  rock's  as the  oscillator =20 pass's   quite a  lot  of =20 power  via them ...hc6u  are  no =20 good  , drive level is very low - the ones = fitted =20 are the wired- gold  flashed  = ones  ,=20 so  cannot  etch  into the  band = ...=20
 
the  gang  want  to  = keep =20 it  standard
 
73 -G.
 
Ps  waiting  for  qty-3 =20 =A36   dongles : )

From: M0FMT
Sent: Wednesday, April 10, 2013 11:43 = PM
To: rsgb_lf_group@blacksheep.= org=20
Subject: Re: LF: Wanted 10XJ or FT243 = XTALS Range=20 236.25 236.75 KHz

Hi
 
If you want to spend a small fortune get = them cut.=20 However build a Mixer VXO from El cheapo standard = xtals and or=20 old PMR rocks. Then at your next rally buy a couple of = Screw=20 together 10xj or FT243 rocks of any frequency and put = the=20 El-cheapo xtals inside. And Hey Presto you have Retro=20 rocks.
I have a small all valve 472 tx that uses = 6.00=20 -6.472=3D0.472 vxo-able a couple of kc/s = 12ax7-6am6-6cl6=3D=20 4wattso/p. Local QRP rig.
Hope this helps
 
73 es GL Pete M0FMT IO91UX
From: Graham = mailto:g8fzk@g8fzk.fsnet.co.uk=
To: rsgb_lf_group@blacksheep.= org=20
Sent:=20 Wednesday, 10 April 2013, 20:30
Subject: LF: = Wanted=20 10XJ or FT243 XTALS Range 236.25 236.75 KHz=20

Wanted  10XJ  or  FT243 =20 XTALS   Range   = 236.25   =20 236.75  KHz   
 
Q  Is there  any  = manufacture =20 of   crystals  in this  = range =20 ?
 
Or  Surplus    = items  =20 available 
 
QTY 1  or  2  off  =
 
TNX- Graham
 
=
G0NBD


=




<= BR>
--=20
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast =
UK




--=20
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast =
UK




--=20
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK
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