Heathkit

Heathkit Collection

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HG-10 / VF-1 Power Supplies

I designed a PC board for 2 separate power supplies mounted on a small BUD chassis. The Hammond power transformer and HP-23 choke on the left is for the VF-1 supply and the Hammond power transformer on the right is for the HG-10 power supply.

The 3 position toggle switch is from a Heathkit HP-23 power supply. The switch selects the desired power supply output at the octal socket on the right. Switch setting to the left selects the HG-10 supply output, Switch center setting turns power OFF, and switch setting to the right selects the VF-1 supply output.

Dual power supply PC board mounted below the chassis using dual 6x32x3/8 female hex stand-offs. Power supply section on the right is for the HG-10 built from the HG-10 manual schematic Figure 4 page 29 and the power supply on the left is for the VF-1 supply.

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HW-100 and HW-101 LMOs

There are differences in the 2 LMOs. For example, the HW-100 LMO on the left will not work in an HW-101 nor will an HW-101 LMO on the right work in an HW-100.

The LMO tube is NOT the oscillator but rather it’s a “Buffer Amp”. The oscillator is solid-state MPF-105 FET. Both LMO frequency ranges are the same, 5.5 MHz at the bottom of ALL bands and 5.0 MHz at the top of ALL bands.

The LMO tuning ranges do not change when the band changes like some older VFOs do (HG-10, VF1, etc).

The LMOs are used in both RX and TX. A failed LMO will result in the loss of both RX and TX.

 

HW-100 (Left) and HW-101 (Right) VFOs.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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NEW HW-101 VFO Planetary Ball Drives

Cleaning variable capacitor flex shaft video (once the VFO is removed from the HW-101):

https://w5rkl.com/wp-content/uploads/2015/02/Cleaning-Variable-Capacitor-Flexible-Shaft-to-Frame-connection.wmv

Replacing the HW-101 VFO Jackson ball drives (once the VFO is removed from the HW-101)

https://w5rkl.com/wp-content/uploads/2018/08/Replacing-Jackson-Drive-on-HW101-LMO.wmv

Original (top) HW-101 VFO planetary ball sides and new HW-101 VFO Planetary ball drives (bottom). The ball drives were made by Oren Elliott Products INC in Ohio.

 

 

 

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Apache TX-1 (Left Mohawk RX-1 (Right) non amplified D-104. PTT change made to the transmitter with 4PDT 6VDC relay powered by internal 5VDC regulated power supply in the bottom rear of the Apache..
All-solid-state GR-78 six-band short wave receiver. The power source is a chargeable battery pack. I removed the 120VAC charger circuit. The battery pack has lasted for over 2 years. the receiver works rather well with the simple extendable vertical antenna. An outside antenna increases the reception.

 

 

Marauder HX-10 AM/CW/SSB VFO controlled transmitter. This model was the last of Heathkit’s “BIG” ham receivers and transmitters. AM power is 25W while SSB is 100 watts peak and CW is 100 watts. The HX-10 didn’t work when I got it. I had to replace the final amplifier’s screen resistor. I also replaced all of the filter capacitors. It works rather well now.

 

Regulated HV and LV power supplies. The frequency counter (top right) is an all-solid-state Opto 8000 0-512Mhz counter.

 

 

Various solid-state Voltmeters and VTVMs.