On 3/7/2013 3:01 PM, Lee Mairs (SAG) wrote:
>
>
> Regarding sorting the crystals, I assume three are for the filter and
> one for the oscillator.

Correct.

Is it just the three for the oscillator that
> must be close together in actual frequency?

Normally, that would be the case. BUT, in Diz's design, the LO
crystal may have to be close to the other three in order to hit the
center of the crystal filter passband. I don't know how much LO
adjustment is provided in his kit.

Sure wish I'd built Jim
> Kortge's crystal checker now...

Not too late Lee. I still get emails occasionally from someone who
has decided to build a PVXO and Crystal Checker circuit so that they
can roll their own filters.

I've had all the parts for about ten
> years now...

And I've heard that a few times along the way! :-)

72 my friends and have fun,

Jim, K8IQY

----- Original Message -----

From: Lee Mairs (SAG)

To: 4sqrp@...

Sent: Thursday, March 07, 2013 2:01 PM

Subject: Re: [4sqrp] Pig Rig Rocks

Regarding sorting the crystals, I assume three are for the filter and one for the oscillator.  Is it just the three for the oscillator that must be close together in actual frequency?  Sure wish I'd built Jom Kortge's crystal checker now...  I've had all  the parts for about ten years now...
73 de Lee
KM4YY

On 3/7/2013 2:34 PM, Bart Lawson wrote:

 

Terry,

If you are willing to ship half of the xtals to me I would be glad to sort them and test them and ship them to their eventual owners. I would be willing, as well, to pick up the shipping cost to help you out.

cu, Bart

 

Terry,

If you are willing to ship half of the xtals to me I would be glad to sort them and test them and ship them to their eventual owners. I would be willing, as well, to pick up the shipping cost to help you out.

cu, Bart



It has been exciting to see all the chatter on the reflector about the Pig Rigs and using 7122.  It's great to see so much enthusiasm.

 

I ordered the crystals today and they will be delivered mid to late April.  Sri that it will take so long but they are a special ordered frequency (7122.3) to accommodate the heavy loading in the filter.  Meanwhile you can get the PigRigs up and running on the crystals that Diz sends in the kit.  

 

The 7122 crystals came in a little higher than expected, but $2 each will still cover them.  As mentioned below, I'm covering the mailing costs myself, no club money is being spent on this project.  Lets wait until they arrive to pay for them. With Ozarkcon coming on plus some new kits in the works,  I really don't have the time to manage a list right now. 

 

Don't forget to use machined pins or SIP pin socket for the crystal positions for easy QSYing.  Here's picture of a machined pin IC socket - a source of pins.  http://www.mouser.com/ProductDetail/Mill-Max/110-99-308-41-001000/?qs=sGAEpiMZZMs%2fSh%2fkjph1tvt1%2fmEPT%2fXohCHKUr4WR4Y%3d   and here's a sip crystal socket  http://www.wa0itp.com/sip%20crystal%20socket.jpg

 

Additionally the filter crystals will need to be sorted to be close enough to each other in frequency to produce a narrow filter bandwith.  I'm guessing that sorting to 20-30 cycles will be adequate, it will take an oscillator and a counter as a minimum. We will have to 'spearmint with some sorted sets to make sure.   

 

Anyone volunteer to sort a few and try them in their rig to check the opposite sideband suppression? 

Its easy:  Try it on your pigrig when you get up and running to get a feel for it.

. Unhook the antenna to the pigrig

. Switch your big rig to a dummy load and turn down the power

. Then sweep the big rig past the pigrig and see if you can hear the opposite sideband as the big rig goes past. 

. If  it's almost non existent, it's good enough. 

----------------------------------
I love this radio stuff !
72   WAØITP
www.wa0itp.com
www.4sqrp.com
www.qrpspots.com
 
 

----- Original Message -----

From: WA0ITP

To: 4sqrp@...

Sent: Sunday, March 03, 2013 1:44 PM

Subject: [4sqrp] PigRigs and Crystals



Right on Jerry.

 

If the Group is interested, I'll organize a group purchase of 7122 crystals.  They will probably cost between $1 and $2 each.  I'll take the bulk delivery and mail your 4 xtals to you.  The postage will be on my nickel.

 

If at least 10 members sign up, I'll go ahead and place the order.  Wanna do it?

 

FYI Diz only has 60 PigRigs left. 

 

btw usual disclaimers apply both on the crystals and the rigs.

----------------------------------
I love this radio stuff !
72   WAØITP
www.wa0itp.com
www.4sqrp.com
www.qrpspots.com
 
 

----- Original Message -----

From: Jerry Haigwood

To: 4sqrp@...

Sent: Sunday, March 03, 2013 1:11 PM

Subject: RE: [4sqrp] 4S QRP Watering Holes!

Hi All,

     I believe it was Diz’s intent to use the Pig Rig for clubs, nets, etc.  Each club (such as 4sqrp) could have their very own frequency setup.  That way, the club members could stay in contact with one another.  It is not necessary to stick with 7030.7KHz but rather the club could pick a different frequency.  Once the club had picked a frequency then the club would buy the required crystals from whomever they like to put their pig rigs on that frequency.  The radio was never intended to be a general purpose 40 meter radio but was intended for single frequency use by clubs or nets.  I remember when I was about 16 years old, the one of the local AM radio stations was giving away am radios as a promotion.  Of course, the radios only received the single am station that was giving them away!  They had a single knob – on/off and volume.

Jerry W5JH

"building something without experimenting is just solder practice"

 

 

 

From: 4sqrp@... [mailto:4sqrp@...] On Behalf Of Bill Cromwell
Sent: Sunday, March 03, 2013 9:16 AM
To: 4sqrp@...; John R. Lonigro
Cc: Charles Moizeau
Subject: Re: [4sqrp] 4S QRP Watering Holes!

 

 

On Sun, 2013-03-03 at 05:50 -0600, John R. Lonigro wrote:
>
> Charles:
>
> The unique feature of the Pigrig is the narrow crystal filter is also
> tuned to 7.031 MHz. The entire rig is designed around that frequency.
> Diz was able to do that because it is a single frequency rig. That's
> why, for example, you can't easily modify it to use the SAVXO.
>
> 72,
> John AA0VE

Hi,

To be crystal clear (pun intended) the crystal filter is in the front
end of the receiver and NOT at some IF or "shifted frequency". A VXO
won't help much. It sounds like a lot of fun. But it's not my cup of tea
being so restricted, either. Unless..I have some *other* radios I can
use when the Pig Rig frequency is in use. Like the radios that surround
me when I'm typing emails (evil grin).

73,

Bill KU8H

----- Original Message -----

From: WA0ITP

To: 4sqrp@...

Sent: Sunday, March 03, 2013 1:44 PM

Subject: [4sqrp] PigRigs and Crystals



Right on Jerry.

 

If the Group is interested, I'll organize a group purchase of 7122 crystals.  They will probably cost between $1 and $2 each.  I'll take the bulk delivery and mail your 4 xtals to you.  The postage will be on my nickel.

 

If at least 10 members sign up, I'll go ahead and place the order.  Wanna do it?

 

FYI Diz only has 60 PigRigs left. 

 

btw usual disclaimers apply both on the crystals and the rigs.

----------------------------------
I love this radio stuff !
72   WAØITP
www.wa0itp.com
www.4sqrp.com
www.qrpspots.com
 
 

----- Original Message -----

From: Jerry Haigwood

To: 4sqrp@...

Sent: Sunday, March 03, 2013 1:11 PM

Subject: RE: [4sqrp] 4S QRP Watering Holes!

Hi All,

     I believe it was Diz’s intent to use the Pig Rig for clubs, nets, etc.  Each club (such as 4sqrp) could have their very own frequency setup.  That way, the club members could stay in contact with one another.  It is not necessary to stick with 7030.7KHz but rather the club could pick a different frequency.  Once the club had picked a frequency then the club would buy the required crystals from whomever they like to put their pig rigs on that frequency.  The radio was never intended to be a general purpose 40 meter radio but was intended for single frequency use by clubs or nets.  I remember when I was about 16 years old, the one of the local AM radio stations was giving away am radios as a promotion.  Of course, the radios only received the single am station that was giving them away!  They had a single knob – on/off and volume.

Jerry W5JH

"building something without experimenting is just solder practice"

 

 

 

From: 4sqrp@... [mailto:4sqrp@...] On Behalf Of Bill Cromwell
Sent: Sunday, March 03, 2013 9:16 AM
To: 4sqrp@...; John R. Lonigro
Cc: Charles Moizeau
Subject: Re: [4sqrp] 4S QRP Watering Holes!

 

 

On Sun, 2013-03-03 at 05:50 -0600, John R. Lonigro wrote:
>
> Charles:
>
> The unique feature of the Pigrig is the narrow crystal filter is also
> tuned to 7.031 MHz. The entire rig is designed around that frequency.
> Diz was able to do that because it is a single frequency rig. That's
> why, for example, you can't easily modify it to use the SAVXO.
>
> 72,
> John AA0VE

Hi,

To be crystal clear (pun intended) the crystal filter is in the front
end of the receiver and NOT at some IF or "shifted frequency". A VXO
won't help much. It sounds like a lot of fun. But it's not my cup of tea
being so restricted, either. Unless..I have some *other* radios I can
use when the Pig Rig frequency is in use. Like the radios that surround
me when I'm typing emails (evil grin).

73,

Bill KU8H