[ARC5] programable crystal oscillators

Sun Apr 23 13:34:25 EDT 2017

Please clarify : the freq must be in MHZ ok but is it only even MHZ that is 
available i.e. 1mhz 2mhz etc..I take it if you want 1415khz (for an ARC bfo 
e.g) you cannot get it by ordering 1.415 MHZ or can you?..what if you want 
6800khz (to use in a 40 converter with a BC-453)? can you get a programmed 
6.800 mhz device?  I think also that they are only available from 1mhz up? 
then 455khz etc. is out even if it is 0.455mhz...73 de Pat/EI7CN

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Sent: Sunday, April 23, 2017 12:25 PM
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Subject: ARC5 Digest, Vol 159, Issue 46

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Today's Topics:

   1. Re: Rollerductor setting (Brian)
   2. Re: Crystal Alternative (jeepp)

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Message: 1
Date: Sun, 23 Apr 2017 16:51:30 +1000
From: "Brian" <brianclarke01 at optusnet.com.au>
To: "J Mcvey" <ac2eu at yahoo.com>, "Kenneth G. Gordon"
<kgordon2006 at frontier.com>, "J Mcvey via ARC5" <arc5 at mailman.qth.net>
Subject: Re: [ARC5] Rollerductor setting
Message-ID: <E19C9F519AB64D3A83E5F98BCD0E8444 at BrianPC>
Content-Type: text/plain; charset="utf-8"

Some issues to consider:

  a.. Nowhere in your line-up is there a measure of line impedance. Many 
Wattmeter designers assume a 50 Ohm line, and so, for economy, read either 
the current or the Voltage ? these ones have a linear scale. Bird Wattmeters 
are designed for specific line impedances. Walter Breune (one of Art 
Collins? designers) came up with a Wattmeter design that multiplied in-phase 
current and Voltage, and so, was independent of line impedance; this design 
appears, for instance, in the TRC-75. This design was copied by General 
Dynamics for use in the GRC-106.
  b.. A similar issue applies to your unun; these need to be designed for a 
specific transmission line impedance. Merely putting it in line with coaxial 
cable does not convert both sides of the unun to the impedance of the coax.
  c.. Coax to a dipole? This means that the outer conductor of your coax is 
part of the antenna, is unbalanced, and so the currents in the inner and 
outer are probably different. If you want to use a unun, then it should be 
at the feed point of your dipole. But we have no idea of the feed-point 
impedance of your dipole ? we can only assume it is somewhat balanced.

73 de Brian, VK2GCE

On Sunday, April 23, 2017 2:11 AM, J McVey said:

Good question. I was not clear on the setup.
The setup is a s follows:

Tx -> cap -> BC-442 (ammeter) ->unun -> coax-> wattmeter-> coax->dipole

The low current is in the unun lo-z primary.

The over-all Z is probably higher because the the reflected antenna 
reactance becomes part of the primary circuit too.
Interesting stuff...

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Message: 2
Date: Sun, 23 Apr 2017 07:25:22 -0400
From: jeepp <jeepp at comcast.net>
To: Bruce Long via ARC5 <arc5 at mailman.qth.net>, Phillip Carpenter
<carpenterpa at tds.net>, "W9RAN at oneradio.net" <W9RAN at oneradio.net>
Cc: ARC-5 QTH <ARC5 at mailman.qth.net>
Subject: Re: [ARC5] Crystal Alternative
Message-ID: <ijih94buhcxbu6f2wsqwy20k.1492946722743 at email.android.com>
Content-Type: text/plain; charset="utf-8"

I wonder if these would work as BFOs for A.R.C. LF receivers if ordered as a 
harmonic of the IF mixing product. ?Joe, WA2EJT wrote this up in ER, in that 
case using the BC-453 as a Q5-er for the BC-348. ?It does work as I use that 
method here. ?I couple the BC-348 IF into the BC-453 (post front end) as a 
sub-harmonic and then tune it to +/- 407 kHz. ?This may be sort of the 
inverse but perhaps there may be sufficient sub-harmonic energy for a 
BFO?Jeep K3HVG

Sent from my Verizon 4G LTE smartphone

-------- Original message --------
From: Bruce Long via ARC5 <arc5 at mailman.qth.net>
Date: 4/22/17  23:16  (GMT-05:00)
To: Phillip Carpenter <carpenterpa at tds.net>, W9RAN at oneradio.net
Cc: ARC-5 QTH <ARC5 at mailman.qth.net>
Subject: Re: [ARC5] Crystal Alternative

As far as I know the Digikey treats the programable osci as a value added 
item.? You need to tell them what freq you want and they will program the 
osc for us.? They count the stock level as zero until they have done the 
programing

       From: Phillip Carpenter <carpenterpa at tds.net>
To: W9RAN at oneradio.net
Cc: ARC-5 QTH <ARC5 at mailman.qth.net>
Sent: Saturday, April 22, 2017 7:15 PM
Subject: Re: [ARC5] Crystal Alternative

Bob,

When I go to the Digi-Key website and put in any of the Epson oscillator 
product numbers, they all say zero availability and won't let you add to the 
cart.

Any advise?

Thank you in advance for your reply!

Phillip W4RTX

Sent from my iPhone

> On Apr 22, 2017, at 6:34 PM, Robert Nickels <ranickel at comcast.net> wrote:
>
> I've shared the following on a couple of groups and since many of you are 
> already familiar with these parts, I figured it would make sense to pass 
> it along here as well.? ? Please contact me off-list for additional 
> information or questions since this is somewhat off-topic and shameless 
> commerce, thanks.
>
> 73, Bob W9RAN
>
>
> The announcement of the impending closing of International Crystals has
> many people thinking about frequency control, which is essential to keep
> many of our older radios on the air. The fact is, International is
> closing for a reason - modern radios and electronics in general simply
> do not generate much demand for standard quartz crystals, and it is even
> more challenging to sustain any kind of one-off custom manufacturing
> business.
>
> Fortunately, modern technology provides alternatives. Since shortly
> after my SDR converter article appeared in Jan. 2013 QST, I switched to
> programmable oscillators made by Epson in a 4 pin DIP (non-SMT)
> package. These are complete crystal-controlled oscillators with
> integrated PLL circuitry that is programmed by the distributor (DigiKey)
> to produce an output on any specified frequency from 1 to 125 MHz. The
> accuracy is stated as 50ppm but I've consistently found it to be better
> than that. These are fixed-frequency devices and cannot be
> reprogrammed, nor can they be shifted in frequency by external
> components such as is done by "warping" a quartz crystal for clarifier
> or RIT, VXO, or FM modulator circuits.
>
> However, they are great fixed frequency sources for receiver local
> oscillators, up- or down-converters, SSB high frequency oscillators, AM
> or SSB marine radios, and transmitters/transceivers. The output is a
> 5 volt p-p square-ish wave but this has not been a problem since
> whatever harmonics are present are filtered out by existing tuned
> circuits in the radio. It is usually possible to obtain proper mixer
> operation by simply coupling the output to the crystal socket, but some
> crystal-controlled transmitters will require an added external amplifier
> to raise the drive level to that required for full power output.
> Naturally, the application of these devices is the responsibility of the
> user.
>
> I have created a small PC board (2" square) to facilitate the use of
> these programmable oscillators. The board has sockets for 1 to 4
> oscillators (4-pin DIP package) and provides full buffering of all
> control and signal leads to protect the delicate oscillators from
> inadvertent damage. The board includes a voltage regulator that
> accepts 8-18 volts input and requires a switch closure to ground or
> logic level "0" signal to select a given frequency. For more information:
>
> http://www.rantechnology.com/four-channel-oscillator-board.html
>
> I've got a limited number of kits available for the price of $18 each,
> postpaid in the US. If you're interested in one, please drop me a
> private email and I will provide details. Note this is for the
> four-channel board only; you must order the oscillators directly from
> DigiKey (current price is $4.10 each, qty 1-10, specify desired
> frequency in MHz in "Order Notes").
>
> Based on our shared interest in restoring and using military radios I
> wanted to give the group advance notice of this alternative.
>
> Thanks and 73,
>
> Bob W9RAN
>
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