|[AMRadio] Re: The Tucker KW|
recycler at swbell.net
Tue Aug 16 19:10:01 EDT 2005
On the 6M rig xtal frequencies are:
TX freq / 32.
RX freq - 5.
The book says: "The (RX) crystal oscillates on its third mechanical
harmonic and is ground especially for use in this circuit". The IF is 5MC.
so it is really: (RX freq -5) / 3
Hmm. So do most crystals oscillate on their third harmonic well?
On the 2M rig, don't know yet about the architecture.
> From: Geoff <w5omr at satx.rr.com>
> Subject: Re: [AMRadio] Re: The Tucker KW
> Patrick Jankowiak wrote:
>>Well I have worked all day Saturday (just quit now 1AM!!) doing more
>>cleaning in the lab. I now have the Link 250UFS, the Tucker KW, and
>>the BTA-250L all next to each other. There are my 6M tranceiver, 80-10
>>xmtr, and 160M xmtr respectively. The Link is FM, but I bet I could
>>amplitude modulate it. Not sure if I want to. Is there more activity
>>on 6M AM or FM?
> Not sure, in the North Texas area.
>>What's the consensus on freq. choices for VHF rigs that are basically
>>fixed-frequency (meaning they take alot of hassle to re-tune)? What
>>are the good manners for that? The simplex frequency?
> For the VHF rig, and in keeping with staying off of the simplex channel
> 24/7, build up a xtal switch. If you've got more than one frequency
> pair in mind (most repeaters all nowadays use a PL tone for access, so
> you'll be better off on simplex with that rig, anyway) you can use the
> switch to move to whatever you have available to you. just some xtal
> sockets mounted on an aluminum chassis, and a rotary switch. That's how
> I've seen it done, even using the old Federal police
> transmitter/reciever combos. Back in the late 50's early 60's, those
> were some 'boat-anchors'. Seperate transmitter, with a 2E26 in the
> final, and a seperate reciever, both on slides in one small(ish) box and
> a control head to the dash, with a cable as big as a horse-... well..
> you get the idea.
>>I have a couple of good stable PLL based 0.5-80MHz VFOs (lab gear)
>>that I could sub for RX and TX crystals if necessary. Talk about
>>having to keep charts.. No rush though, still alot of cleanout left to
> What's the rig use in it? A frequency double-tripler circuit in the
> What's the IF freq of the reciever?
> Some recievers use a simple tripler scheme. A calculator exercise I
> performed with regularity, was the xtal freq of a Regency HR-2A.
> Freq - 10.7 (IF) / 3 = Xtal freq
> 146.64 - 10.7 = 135.94 /3 = 45.3133
> 146.52 would mean it's need a 45.2733333 xtal or, something that's
> going to oscillate at that frequency.
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