RCA Senior Voltohmyst

The RCA WV-98C Senior Voltohmyst (SN 201001 1104)I picked up at the hamfest yesterday looks to be in pretty good working order.

RCA WV-98C Senior VoltOhmyst
RCA WV-98C Senior VoltOhmyst

No smoke, popping or other unusual sounds/odours when I plugged it in. Some initial testing with batteries and some resistors suggests a bit of recalibration or maybe a bit of repair might be needed though.

Fortunately I was able to find a manual for it at the Boat Anchor Manual Archive.

Removing four screws from the back lets you take the back cover off (a fairly substantial chunk of cast aluminum) revealing the innards of the meter.

Back of the RCA Voltohmyst
Back of the RCA Voltohmyst
Voltohmyst circuit board
Voltohmyst circuit board

The blue adjustment screws are trim pots used for adjusting the meter calibration.

One thing that surprised me was the presence of a soldered in D cell.

Top part of the Voltohmyst. Badly corroded 1.5V D cell and transformer
Top part of the Voltohmyst. Badly corroded 1.5V D cell and transformer
1.5V Battery
1.5V Battery

No idea what vintage the battery is or what it’s used for (at the moment), but my multi-meter showed it still had 1.4 V across it. The battery has definitely seen better days. I think I’ll see about replacing the battery with a battery holder so it can be removed and replaced in the future. Fortunately it looks like the wires have enough slack to work with.

The rest of the meter looks to be in pretty decent shape, and pretty clean. Without taking off the face of the meter, it’s a little hard to get in there to check out the middle. There are two tubes in the unit, a 12AU7 and 6AL5.

Lots of colourful wires at the range selector and mode selector switches.

Range selector switch
Range selector switch
Mode selector switch
Mode selector switch

The probe for the meter is a big chunky thing, about the size of a Sharpie marker.

Voltohmyst probe
Voltohmyst probe

Next step will be to go through the manual and read a bit more about the meter works before I try to dive in  and replace things.

WA4USN QSL cards

One of the club‘s older members was clearing out some old stuff and offered up a stack of WA4USN QSL cards to anybody who wanted them, so I grabbed a couple of them.

Years ago he had been given a stack of postcards and information cards by the USS Yorktown Association, so he turned them into QSL cards.

One card features a drawing of the USS Yorktown from before it was modified to enclose the bow portion of the ship. The reverse side lists some interesting statistics about the Yorktown during WW II.

The other card (formerly a USS Yorktown Association “Pay your dues” reminder postcard) has a Grumman F6F-3 Hellcat on the flight deck of the Yorktown, in front of the island.

While they aren’t old cards, I think they are a nice use of some cards that probably would have ended up in the dumpster.

Approved for 630 m and 2200 m

Got an email yesterday clearing me for operating on the new US 630 m and 2200 m bands.

Dear Eugene Mah (AB4UG),

This notice is being provided to Approve your proposed amateur radio station in the 135.7 – 137.8 | 472.0 – 479.0 band(s) at the following coordinates:  XXXXXXXXXXXXX.   UTC has determined that your proposed amateur radio station would not operate within a horizontal distance of one kilometer from a transmission line that conducts a power line carrier (PLC) signal in the 135.7 – 137.8 | 472.0 – 479.0 bands.

An amateur operator must not operate an amateur station if UTC responds that the proposed amateur station is located within 1 km of a transmission line with a PLC system that operates on the same frequency or frequency range.  Amateur operators are advised that their operations within 1 km of a PLC system could cause interference to PLC systems that are used by electric utilities to protect their electric transmission systems against faults and electrical outages.  Interference from amateur operations could affect the operation of PLC systems, thereby affecting the reliability of electric utility operations.  As such, amateur operators are advised not to operate any amateur stations within 1 km of a transmission line with a PLC system that operates on the same frequency or frequency range, and amateur operators will be subject to FCC enforcement for unauthorized operations, as well as potential legal liability for damages that result from interference caused by amateur operations to PLC systems.

Still need to learn about how to get on the new bands.

2m dipole performance

The 2m dipole attachment I made for my monopod seems to be working well. It’s a definite improvement over the Diamond SRH77CA and SRH999 antennas (which already work fairly well) when it comes to receive. I can receive a pretty clear signal from the repeaters from inside the house, whereas with the Diamond antennas, the repeater signal was on the scratchy and noisy side. When I’m outside, all of the antennas perform pretty well.

The two repeaters closest to the house that I can reach (and use) are about 7-8 miles away, so they’re a bit of a reach to hit standing on the ground with a 5W HT. The repeater beeps at me after I transmit, so I think I’m hitting the repeater with the dipole attachment, although I’m not sure how well I’m getting in. The repeater has a voice playback function, but I still need to learn how to use it.

In any case, the dipole attachment seems to be a success, and I can at least monitor some of the repeater activity more easily.

Time to start planning for a dual band VHF/UHF radio for the house.

Tennessee QSO Party 2017

Spent a few hours playing in the Tennessee QSO Party over the weekend.

As expected, all the TN stations I was able to hear were on 40 m. Made a few more contacts than I did last time, but I think more counties this time. Wasn’t able to find the bonus station though.

 Band     QSOs     Pts  Mul  Pt/Q
     7      27      81   21   3.0
 Total      27      81   21   3.0
Score: 1,801
1 Mult = 1.3 Q's

Wasn’t hearing a whole lot of activity across the bands in general, but the 40m shortwave broadcast stations that usually show up in the upper portion of 40m late afternoon/early evening seemed extra loud when they appeared.

It’s nice having the shack back up and running, even if setting up and taking down the antenna means it takes a little more time to get set up.