[AMRadio] Re: AMRadio Digest, Vol 45, Issue 37


D. Chester k4kyv at charter.net
Thu Oct 18 20:47:55 EDT 2007


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----- Original Message ----- 
From: <amradio-request at mailman.qth.net>
To: <amradio at mailman.qth.net>
Sent: Thursday, 18 October, 2007 08:43
Subject: AMRadio Digest, Vol 45, Issue 37


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> Today's Topics:
>
>   1. Re: HAMFEST REMINDER --- THIS SUNDAY (John Dilks K2TQN)
>   2. 20V2 FS Sweetwater, TN (crawfish)
>   3. Re: DX-40 plus other Heath stuff FS on QTH.com (Bry Carling)
>   4. Re: AWA Re: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
>      (Geoff/W5OMR)
>   5. Re: VFO vs XTAL (D. Chester)
>   6. Re: Amateur Radio Vet Turns 100 (D. Chester)
>   7. Re: AWA Re: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
>      (D. Chester)
>   8. Hamfests (D. Chester)
>   9. Re: AWA Re: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
>      (RJ Mattson)
>  10. Re: Hamfests (david knepper)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 18 Oct 2007 05:36:15 -0400
> From: John Dilks K2TQN <oldradio at worldnet.att.net>
> Subject: Re: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
> To: Discussion of AM Radio in the Amateur Service
> <amradio at mailman.qth.net>
> Message-ID: <20071018094048.F3C0C859C40 at mailman.qth.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
>
> Hi John,
>
> I'm planning to attend and am looking forward to it.  Tnx for the
> warning on being early.
>
> 73, John Dilks, K2TQN
>
> At 10:20 PM 10/17/2007, you wrote:
>>Here is a reminder to all amateur radio operators of a free vintage 
>>hamfest
>>to be held in Davidsonville, MD this Sunday. If you really love old
>>gear, here
>>is a tip especially for those living in the Mid-Atlantic area. MAARC, the 
>>Mid
>>Atlantic Antique Radio Club has decided to reach out to amateur radio
>>enthusiasts, especially those interested in boatanchors. In light of
>>this, they are
>>inviting all interested amateurs to a combined Antique Radio Meet and 
>>Vintage
>>Hamfest. The event will be held at 9:00AM Sunday, October 21st at the
>>Davidsonville Family Recreation Center, Davidsonville, MD.
>>Davidsonville is located near
>>Bowie, MD, in the Washington DC suburbs. It is easily reachable via US 
>>Route
>>50 and this connects to the Washington Beltway and the Chesapeake Bay 
>>Bridge.
>>For you Southerners, US 301 or I-95 are options.
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 18 Oct 2007 04:41:51 -0500
> From: "crawfish" <crawfish at surfmore.net>
> Subject: [AMRadio] 20V2 FS Sweetwater, TN
> To: amRadio at mailman.qth.net
> Message-ID: <000a01c8116b$1da22e80$8f52fea9 at default>
> Content-Type: text/plain; charset="iso-8859-1"
>
> W4OLJ has a Collins 20V2 for sale on QTH for $2500. Just taken out of 
> service and is presently on 1460 kHz. Ad#617369.
>                                                                 Joe W4AAB
>
> ------------------------------
>
> Message: 3
> Date: Thu, 18 Oct 2007 07:03:59 -0400
> From: "Bry Carling" <bcarling at cfl.rr.com>
> Subject: Re: [AMRadio] DX-40 plus other Heath stuff FS on QTH.com
> To: Discussion of AM Radio in the Amateur Service
> <amradio at mailman.qth.net>
> Message-ID: <4717055F.25669.2ECAF1 at localhost>
> Content-Type: text/plain; charset=US-ASCII
>
> Even with accessories, it seems like he could wait a long time to
> sell a DX40 for $300.00
>
>> WA0MNA has a Heath station with DX-40 as the transmitter for sale for 
>> $300. shipped.Ad#624294. No receiver, but antenna tuner and VF-1 VFO and 
>> other accessories.He said he needs the bucks. Even a Conelrad Monitor!!
>> 
>> Joe W4AAB
>> ______________________________________________________________
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>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 18 Oct 2007 06:30:19 -0500
> From: Geoff/W5OMR <ars.w5omr at gmail.com>
> Subject: Re: AWA Re: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
> To: Discussion of AM Radio in the Amateur Service
> <amradio at mailman.qth.net>
> Message-ID: <471743CB.7030209 at gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> RJ Mattson wrote:
>> When will it dawn on the AWA to team up with the Rochester, NY hamfest?
>> bob...w2ami
>
> Perhaps they don't -want- to.
>
> They've got some pretty strict (and justifiable) requirements.
>
> -- 
> Driving your AM Rig without a scope,
> is like driving your car at night, without headlights. (K4KYV)
>
> --
> 73 = Best Regards,
> -Geoff/W5OMR
>
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 18 Oct 2007 07:35:06 -0500
> From: "D. Chester" <k4kyv at charter.net>
> Subject: Re: [AMRadio] VFO vs XTAL
> To: <amradio at mailman.qth.net>
> Message-ID: <000501c81183$50b53520$05ceb718 at D65Y8B21>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
>>If the VFO has a coupling cap, tie the VFO output directly to the grid
>
>>of the buffer and see what happens.  If you don't have enough then, move
>>back to the grid of the Osc.  Just be careful of driving the Osc too
>>strongly.
>
>>Jim/W5JO
>
> In my Gates BC1-T I modified the 12BY7 xtal oscillator and converted it to 
> a
> grounded-grid buffer.  Simple - bypass the grid to ground with a .005 or 
> .01
> mfd capacitor.  The cathode already has an rf choke to ground, and the 
> xtal
> feedback circuit connects to the cathode through a capacitor.  Disconnect
> the feedback lead, and replace it with a .01 capacitor, and use that
> capacitor to couple the rf from the outboard vfo directly to  the cathode 
> of
> the stage.
>
> That makes it very easy to convert back to stock if desired.  The vfo 
> outut
> needs to be low impedance.  Mine measures about 1/4 watt into a 50-ohm
> resistor dummy load.  That drives the 12BY7 perfectly.
>
> I use a similar scheme with the same vfo to drive the homebrew rig, to 
> feed
> the type 59 input stage.  I have it wired to automatically convert to the
> conventional pentode xtal oscillator circuit with the vfo plug removed 
> plus
> one jumper connection.
>
> VFO's like the 122 and VF-1 are high-z output, directly from the plate of
> the oscillator tube.  You would need to add an additional stage to boost 
> the
> power to 250mw at low-Z.  An untuned cathode follower stage might do the
> trick.
>
> I use a highly modified T-368 master oscillator unit as my VFO.  The type
> 6000 tube was replaced with a 6AG7 (socket rewiring required), with about
> 200 volts on the plate. A coupling link was added to each of the slug 
> tuned
> output  coils.  That required modification of the bandswitch, with the
> addition of another wafer section.  The addition of the cupling coil
> affected the tuning linearity of output stage somewhat, but it still gives
> pefectly uniform output across each ham band, which is all that counts, 
> but
> the output drops off at the unused frequencies at extreme ends of each
> tuning range.  The stock unit delivered uniform output from 1.5 through
> about 20 mHz, directly into the grid of the 4-250.
>
> My vfo is connected to the transmitter through a RG-59 coax line.  I have
> used as much as 15' of cable.  You can't do that with a stock 122 or VF-1.
> If the vfo cable is more than a few feet long, you lose output.  The 
> output
> circuit has a slug-tuned coil at the plate, which feeds through a coupling
> capacitor to the coax line feeding the transmitter.  The capacitance of 
> the
> coax line resonates with the coil to form a broadly resonant circuit to 
> feed
> the grid of the 1st stage in the t ransmitter.  If the coax is too long, 
> it
> won't hit resonance.  I once used a VF-1, and tried replacing the output
> coil with one that would resonate with a long run of coax, but it tuned 
> too
> sharply, and wouldn't supply full  grid drive across the entire band.
>
> Don k4kvy
>
>
>
>
>
>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Thu, 18 Oct 2007 07:38:10 -0500
> From: "D. Chester" <k4kyv at charter.net>
> Subject: [AMRadio] Re: Amateur Radio Vet Turns 100
> To: <amradio at mailman.qth.net>
> Message-ID: <000901c81183$be7473f0$05ceb718 at D65Y8B21>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Didn't he collaborate with another ham from NC ad write an article, or 
> maybe
> a series of articles a couple of decades ago about ground radials?  If
> that's who it is, I have worked him over the air many times.
>
> Don k4kyv
>
>
>
> ------------------------------
>
> Message: 7
> Date: Thu, 18 Oct 2007 07:49:58 -0500
> From: "D. Chester" <k4kyv at charter.net>
> Subject: Re: AWA Re: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
> To: <amradio at mailman.qth.net>
> Message-ID: <000d01c81185$64154fe0$05ceb718 at D65Y8B21>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> I just wish the AWA meet weren't so far away.  I've never been to one - 
> just
> too many miles to drive for a swapmeet, and no-one around here is 
> interested
> in teaming up for the trip.
>
> I did attend the Rochester hamfest a couple of times when I lived in
> Massachussetts, back in the 70's.  It was great for just the kind of stuff 
> I
> look for, but like all other  hamfests, that  has no doubt  changed by 
> now.
>
> I remember one year, when I did not attend,  NY state tax agents came on
> site and closed the entire flea market down because some kind of paper 
> work
> had not been submitted in proper form.  I'm surprised it didn't incite a
> riot.
>
> Don k4kyv
>
>
>
> ------------------------------
>
> Message: 8
> Date: Thu, 18 Oct 2007 08:04:52 -0500
> From: "D. Chester" <k4kyv at charter.net>
> Subject: [AMRadio] Hamfests
> To: <amradio at mailman.qth.net>
> Message-ID: <001101c81187$78dfd010$05ceb718 at D65Y8B21>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
>
>> Our local hamfests ban computer scrap entirely.  No computer items 
>> allowed
>> whatsoever.  Anyone found selling computer debris is escorted off the
>> property.  Has worked brilliantly for he last 5 years.  It a pleasure and
>> a
>> blessing to only find proper  radio stuff at local festers.
>>
>> Ed, VA3ES
>
> Just about as annoying at hamfests is the non-radio related arts 'n crafts
> junk.  I have seen some hamfests that were more like a general fleamarket,
> with jewellery, paintings and drawings, dolls, etc. in addition to all the
> computer scrap.  If you looked hard enough you might find a little  radio
> stuff scattered in between.
>
> One of the most pleasant hamfest  flea markets I ever remember was in the
> early 80's at Chattanooga, TN.  It was held at the UT campus,  in a 
> parking
> lot next to the cafeteria.  The flea market was divided into two distinct
> sections.  One was for arts and crafts and other non-radio items, while 
> the
> other was strictly for radio and electronic items.  There were loads of
> vintage parts on display.  To cap it off, there was a very mellow sounding
> local rock band playing - not too loud, just right for pleasant background
> music, but you could still easily talk over it.  The cafeteria opened for
> lunch, and they had a good menu of real food instead of the normal hamfest
> slop.
>
> Unfortunately, they held the hamfest at that venue only one year.  From 
> then
> on, it became a typical indoor  flea market with practically nothing of
> interest to me.  I attended the indoor event once and decided it was not
> worth the trip.
>
> Don k4kyv
>
>
>
> ------------------------------
>
> Message: 9
> Date: Thu, 18 Oct 2007 09:14:22 -0400
> From: "RJ Mattson" <rjmattson at hvi.net>
> Subject: Re: AWA Re: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Message-ID: <002601c81188$cda90610$5ec164d0 at Compaq2200>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I think the idea is to get exposure and new AWA members to a dying
> organization.
> Segregating AWA member/sellers to one area should be easy.
> bob...w2ami
>
> ----- Original Message ----- 
> From: "Peter Markavage" <manualman at juno.com>
> To: <amradio at mailman.qth.net>
> Sent: Wednesday, October 17, 2007 11:31 PM
> Subject: Re: AWA Re: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
>
>
> Probably the AWA doesn't want its members to have to wade through 3
> aisles of computer junk just to find an antique radio seller. The nice
> thing about the AWA gathering is that their buyers and sellers are
> focused on a very niche time frame.
>
> And, don't forget, there is a big hamfest in Sellersville, PA this
> Sunday, 10/21. Weather forecast looks perfect.
>
> Pete, wa2cwa
>
> On Wed, 17 Oct 2007 22:55:36 -0400 "RJ Mattson" <rjmattson at hvi.net>
> writes:
>> When will it dawn on the AWA to team up with the Rochester, NY
>> hamfest?
>> bob...w2ami
>>
>> ----- Original Message ----- 
>> From: <W4AWM at aol.com>
>> Subject: [AMRadio] HAMFEST REMINDER --- THIS SUNDAY
>>
>>
>> Here is a reminder to all amateur radio operators of a free vintage
>> hamfest
>> to be held in Davidsonville, MD this Sunday. If you really love old
>> gear,
>> here
>> is a tip especially for those living in the Mid-Atlantic area.
>> MAARC, the
>> Mid
>> Atlantic Antique Radio Club has decided to reach out to amateur
>> radio
>> enthusiasts, especially those interested in boatanchors. In light of
>> this,
>> they are
>> inviting all interested amateurs to a combined Antique Radio Meet
>> and
>> Vintage
>> Hamfest................................
>> 73 and hope you can make it.
>> John,  W4AWM
> ______________________________________________________________
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
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> the word unsubscribe in the message body.
>
>
>
> ------------------------------
>
> Message: 10
> Date: Thu, 18 Oct 2007 09:36:50 -0400
> From: "david knepper" <collinsradio at comcast.net>
> Subject: Re: [AMRadio] Hamfests
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Message-ID: <000b01c8118b$f0ae24d0$6601a8c0 at david55c4eb8b0>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=response
>
> Has anyone ever considered that our XYLs also enjoy attending  hamfests.
> My wife enjoys accompanying me to hamfests because of the variety of items
> for sale that are non-ham related.  Many ladies, as you know, are not
> interested in rummaging through a box of old tubes or drooling over some 
> old
> boatanchor.   If you don't care to look at computer equipment, etc., then
> walk on but please don't put a sign up at the gate restricting sales to 
> ham
> gear exclusively.
>
>
> Dave, W3ST - W3CRA
> Collins Radio Association
> www.collinsra.com
> Join the largest Collins group in the world
> Nets on 7208 at 4:30 EDST every day and
> Monday at 3805 at 8 PM EDST
>
> ----- Original Message ----- 
> From: "D. Chester" <k4kyv at charter.net>
> To: <amradio at mailman.qth.net>
> Sent: Thursday, October 18, 2007 9:04 AM
> Subject: [AMRadio] Hamfests
>
>
>>
>>> Our local hamfests ban computer scrap entirely.  No computer items
>>> allowed
>>> whatsoever.  Anyone found selling computer debris is escorted off the
>>> property.  Has worked brilliantly for he last 5 years.  It a pleasure 
>>> and
>>> a
>>> blessing to only find proper  radio stuff at local festers.
>>>
>>> Ed, VA3ES
>>
>> Just about as annoying at hamfests is the non-radio related arts 'n 
>> crafts
>> junk.  I have seen some hamfests that were more like a general 
>> fleamarket,
>> with jewellery, paintings and drawings, dolls, etc. in addition to all 
>> the
>> computer scrap.  If you looked hard enough you might find a little  radio
>> stuff scattered in between.
>>
>> One of the most pleasant hamfest  flea markets I ever remember was in the
>> early 80's at Chattanooga, TN.  It was held at the UT campus,  in a
>> parking lot next to the cafeteria.  The flea market was divided into two
>> distinct sections.  One was for arts and crafts and other non-radio 
>> items,
>> while the other was strictly for radio and electronic items.  There were
>> loads of vintage parts on display.  To cap it off, there was a very 
>> mellow
>> sounding local rock band playing - not too loud, just right for pleasant
>> background music, but you could still easily talk over it.  The cafeteria
>> opened for lunch, and they had a good menu of real food instead of the
>> normal hamfest slop.
>>
>> Unfortunately, they held the hamfest at that venue only one year.  From
>> then on, it became a typical indoor  flea market with practically nothing
>> of interest to me.  I attended the indoor event once and decided it was
>> not worth the trip.
>>
>> Don k4kyv
>>
>> ______________________________________________________________
>> Our Main Website: http://www.amfone.net
>> AMRadio mailing list
>> List Rules (must read!): http://w5ami.net/amradiofaq.html
>> List Home: http://mailman.qth.net/mailman/listinfo/amradio
>> Help: http://mailman.qth.net/mmfaq.html
>> Post: mailto:AMRadio at mailman.qth.net
>> To unsubscribe, send an email to amradio-request at mailman.qth.net with
>> the word unsubscribe in the message body.
>
>
>
> ------------------------------
>
> ______________________________________________________________
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>
> End of AMRadio Digest, Vol 45, Issue 37
> *************************************** 



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