Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [modification]

Questions regarding the modification of existing radio equipment to add features or improve performace

14 questions
6
votes
1 answer

Kenwood D710: loud fan noise when used in the shack

The fan in the Kenwood D710 mobile radio is turning on on every transmission, including the periodic APRS beacons. This happens even when there is no actual need for spinning it, and is very annoying in a quiet shack (as opposed to under the car…
Georg DO1GL
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6
votes
4 answers

Can I listen to hams on a standard AM/FM broadcast receiver?

I am very much out of practice with amateur radio (like many others), so to some, this question may seem obvious. I don't have any specialised amateur radio equipment, but I do have a Sanyo AM/FM broadcast receiver (240V, 50 Hz, model no. MCD…
user17
5
votes
1 answer

Can I modify my radio to transmit on frequencies that I can currently only listen to?

I bought a radio that can receive 4 ham bands, but only transmit on 2. Can I modify my radio to transmit on these frequencies legally?
Timtech
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4
votes
1 answer

Frequency Display for Old Tube Radio

I have a Hallicrafters S-120 1960s vintage vacuum tube receiver (an "All American Five" superhet with solid state rectifier replacing one of the "five" tubes). It works well, doesn't have excessive internal noise, and seems very sensitive (with the…
Zeiss Ikon
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3
votes
1 answer

RG-174 to pull signal from 1st IF?

I've built a high impedance buffer out of an op amp on a small piece of perf board. I'm going to attach the input to the first IF on an Icom IC-718 and the output will be pulled out to a jack that I've drilled into the case. I know that I want to…
David Hoelzer
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3
votes
1 answer

Replace transistors in MiniPA amplifier kit

I recently purchased a MiniPA 100-watt HF amplifier kit. It is a class AB push-pull amplifier and uses the MRF 9120 transistor. While doing some reading on this amplifier kit I noticed some discussion of using a pair of the more powerful MRF300…
pg1989
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3
votes
1 answer

Is it possible to convert a euro Yaesu 991a to US band plan?

I bought a euro Yaesu 991a . The vhf/uhf band plan is severely limited for use in the US . I have tried the button presses as shown for the earlier 991 and the service mode works to open the frequency for transmission but setting offsets etc are not…
rocco
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3
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1 answer

Is there a way to modify my Yaesu FT-60 to transmit on all 4 ham bands it can receive?

I have a Yaesu FT-60, and it can transmit on 2m, 70cm, and receive 1.25m and 33cm bands. I would really like to find a way to get it to transmit on 1.25 and 33cm. Is there a way to make this happen?
PearsonArtPhoto
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3
votes
1 answer

Can the external VFO input in a Heathkit SB-(100, 101, 102) be used to operate on frequencies outside the radio's normal range?

I've got a Heathkit SB-102 that I'm working on making operational (problems with transmit, receiver works just fine). This model radio has a 9-pin Molex connector in the back, intended to connect an external auxiliary VFO. By design, this feature…
Zeiss Ikon
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2
votes
2 answers

Adapting an antenna tuner for use with a panel meter instead of an LED

I'm building NorCal's / W6JJZ's BLT tuner (pdf) for use on 40m/20m with a 5W transmitter. I would like to remove the LED and use a small panel meter instead. I don't have a 1N34A at hand, but I do have a 1N4148. It seems to work fine. What kind of…
user885
2
votes
1 answer

Adding a panadapter via SDR

I've become very accustomed to the waterfall display on my SDR, especially for digital modes over HF. I'm thinking about tying into the IF on my IC-718 and connecting to an SDR to add a waterfall to the Icom, but I hesitate. The electronics work…
David Hoelzer
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2
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1 answer

DVMega / DVDongle with a TNC connection to radio

What I want to do is add digital voice (DMR, D-Star, Fusion) capability to an existing dual band mobile or HT. Similar to adding APRS functionality using APRSDroid and a bluetooth TNC. Reading here, I understand this can't be done purely in software…
kbyrd
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0
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1 answer

How do I modify a Yaesu FT-726R from Japan with limited VHF 2 meter bands to use US VHF 2 meter bands?

I purchased this online an love the radio but VHF is limited to 144.00 to 146.00. Our local repeater is at 146.760. Any help would be appreciated. Thanks.
Todd KF0LNB
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1 answer

multiband mimo ad-hoc wireless connections from different spectrums

I'd like to create a multiband MIMO ad-hoc wireless network. Can I turn on every GPS, WIFI and Bluetooth radio of a mobile device and synchronize data transfers at extreme speeds between a small, short-range network of devices? Software would…
iphoneguy38440
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