Thursday, April 19, 2018

More on TTL Computer


I'm not the only one with a home built TTL computer.  Some other folks have spent years and done incredible work.  Check out projects like the Gigatron and Magic 1 from the links here

Here's a couple better pictures of the front panel of my silver box TTL computer.




One front panel light (LED) is connected to a 3909 circuit.  That's a special low power blinker that just blinks the light every second or two for over a year.  That's the first thing to get running.


Monday, April 16, 2018

Homebuilt Computer


A long time ago, in a galaxy far away (Montana) I built a computer.   Not plugging in boards but rather building the boards themselves.   No microprocessors - just basic TTL integrated circuits.   I saw the diagram for an old HP computer and thought - if that's all there is, I can do that.

So I did.

It worked - very slowly.

Then I took most of it apart to save the IC's.  (silly silly silly...)

Now that the Force has rewoken and the last Jedi returned - it's time to rebuild the old computer.

There's a lot to this and it's going to take several forms of both hardware and software.  So it's going to take a while.   That's part of the fun.

Here's my computer and I at a computer show of sorts in Bozeman back in 1978...


The SWTP CT-64 terminal and cassette deck are misleading.  The homebuilt TTL computer in the silver box with the rows of lights never did have a serial interface.  That's yet another challenge for the new versions.

Thursday, March 29, 2018

Higher Low Speed Easy - 4800 baud APRS


Onward to the future.   I realized yesterday that all the pieces were at hand to start running 4800 baud APRS packet as well as good old 1200 baud.  It simply required a small tweak to an existing configuration of the DIREWOLF software modem.  Thanks to the ease of working with windows audio systems - both the new DIREWOLF modem and the existing UZ7HO (1200 baud) system can run at the same time with the signal source - the 6 pin mini-din data jack on a Kenwood D710A.  The built in TNC on the D710 is running as a 9600 baud digipeater on our UHF packet channel.

Now to advertise it and see if anybody else wants to experiment.

73
Bill, WA7NWP


Wednesday, March 28, 2018

We'll be back...


2017 ... So much to say..   Not sure yet where to say it.   Perhaps moving all content here to the homegrown content system.  Stay tuned and 73's (t)...

Update 3/28/18 - the homegrown CMS is coming along slowly.  I will eventually move everything there.  In the meantime I'm going to start posting here again just as a place to keep things online.


Friday, June 10, 2016

CQ 29.6


To the PNWVHF discussion group

> Ssb/fm 50, 144, 432 mhz

Not that the typical VHF bands are crowded, but do thoughts of operation ever drop to 10 meters.  The FM segment, typically 29.6 simplex, has operating characteristics similar to FM on 6 meters.  Most of the time it's dead quiet, then it opens up and the world comes rolling in.

I recently discovered, acquired (thanks HRO Portland) and yesterday installed the Diamond CP-610 vertical for 6 and 10 meters.

   http://www.eham.net/reviews/detail/9578

My idea is to use this for typically FM operation.  Scanning with the FT8900 when I'm in the shack and switching over to old slow packet when I'm not in.

So far, without trying to key up repeaters, I've worked the remote base in Shelton and that's it on 52.525.  Calling and calling on 29.6 returns nothing but static.  Surprising how much static there is even on FM.

So - anybody else playing on 29.6 and 52.525?

73
Bill, WA7NWP

Friday, March 18, 2016

Ham Share PIXIE project

Registering for the Auburn, WA.  One Day Build a QRP 40 Meter CW Radio Workshop.
HAM-RADIO-7-023-7-026MHz-QRP-PIXIE-Transmitter-Receiver-DIY-Kit-With-Buzzer


HAMSHARE presents: "RF 40 Meter TxRx Workshop
Build and Operate a working RF 40 Meter Transmitter and Receiver  on 7.030MHz Using a PIXIE TxRx Do-It-Yourself Kit with Sidetone. (ver 4.1)
 
On Saturday  APRIL 30th, 2016  @  9AM ~ 5PM  and Also again on Saturday July 23rd, 2016 @9AM to 5PM
  In The Clubhouse at The River  3611 "I" St NE, Auburn, WA 98002
  37th and "I" Street NE. in North Auburn, WA. 98002 (Go East to Clubhouse)
  Lunch is ~12:30Noon to 1:30PM   ( at Various Local Venues)  


This Workshop is Open to All FCC Licensed Amateur Radio Operators

Learn to:   Build & Construct a Working  40 Meter RF Transmitter and Receiver

What you should bring to the Workshop:
Bring small hand tools:
    Small Diagonal Wire Cutter (Flush Cut style)(#90708  5inch Micro Flush Cutter by Harbor Freight Tools)    
    Needle-nose Pliers.
    60 Watt+ Solder Iron, and Solder, and Tip-Cleaning-Sponge or Wire-Ball (EBAY )
    110Volt AC Multi-Outlet Power strip.
    10 to 25 foot long AC Extension power Cord.


OK to bring Food (Lunch) and Covered Drinks OK! 
Food Available at: (Subway)  (Jack-in-the-Box)
     (Yes Jimmy Johns Delivers: 1835 Auburn Way N, Auburn, WA 98002  (253) 939-3000)
Microwave Available.


Clubhouse is a Non-Smoking-Vapeing facility. (no Alcohol) 
      


 Cost: $15.00 Workshop Fee at the Door. (Kit is included)

 To register, email the following information:

1. Your Name:_________________________________

2. Your Ham Radio Call sign:  _______________________

3. Your Contact Phone Number:_____________________

4. Your Email address:  ____________________________

5.  Class #  2016-04-30-PIXIE-TxRx      
     or     Class# 2016-07-23-PIXIE-TxRx

Send To:        email.hamshare@yahoo.com                    
 


 


In order to see all of the small parts up close, You may wish to bring a pair of Strong Reading Glasses ~ 3.25+ Diopter 
( The local Dollar stores have great selections at a great price)




73 de Bill KL7BB
206-400-1723

When you sign up ask Bill to send you the original email with the photos of the circuit board and parts list so you can print them to bring with you - I'm having trouble getting them into this message...  Curt.

Tuesday, March 1, 2016

Meraki Mesh


My first experience with WIFI Mesh was with some Meraki nodes.   These we an offshoot of the MIT Roofnet project.

I recently acquired a couple more nodes so thought I'd fire them up and see if they still work.  They do and signed right in to the Meraki management dashboard.  It's always a good sign when a company supports things this well.

Meraki Dashboard